MasterObserver (Apache HBase - Server 1.4.14 API)

所有超级接口:

Coprocessor

所有已知实现类:

AccessController, BaseMasterAndRegionObserver, BaseMasterObserver, VisibilityController
```
@InterfaceAudience.LimitedPrivate(value="Coprocesssor")
@InterfaceStability.Evolving
public interface MasterObserver
extends Coprocessor
```
Defines coprocessor hooks for interacting with operations on the HMaster process.

嵌套类概要
- 从接口继承的嵌套类/接口 org.apache.hadoop.hbase.Coprocessor
  Coprocessor.State

字段概要
- 从接口继承的字段 org.apache.hadoop.hbase.Coprocessor
  PRIORITY_HIGHEST, PRIORITY_LOWEST, PRIORITY_SYSTEM, PRIORITY_USER, VERSION

方法概要

方法
限定符和类型	方法和说明
`void`	`postAbortProcedure(ObserverContext<MasterCoprocessorEnvironment> ctx)` Called after a abortProcedure request has been processed.
`void`	`postAddColumn(ObserverContext<MasterCoprocessorEnvironment> ctx, TableName tableName, HColumnDescriptor column)` Called after the new column family has been created.
`void`	`postAddColumnHandler(ObserverContext<MasterCoprocessorEnvironment> ctx, TableName tableName, HColumnDescriptor column)` Called after the new column family has been created.
`void`	`postAddRSGroup(ObserverContext<MasterCoprocessorEnvironment> ctx, String name)` Called after a new region server group is added
`void`	`postAssign(ObserverContext<MasterCoprocessorEnvironment> ctx, HRegionInfo regionInfo)` Called after the region assignment has been requested.
`void`	`postBalance(ObserverContext<MasterCoprocessorEnvironment> ctx, List<RegionPlan> plans)` Called after the balancing plan has been submitted.
`void`	`postBalanceRSGroup(ObserverContext<MasterCoprocessorEnvironment> ctx, String groupName, boolean balancerRan)` Called after a region server group is removed
`void`	`postBalanceSwitch(ObserverContext<MasterCoprocessorEnvironment> ctx, boolean oldValue, boolean newValue)` Called after the flag to enable/disable balancing has changed.
`void`	`postClearDeadServers(ObserverContext<MasterCoprocessorEnvironment> ctx, List<ServerName> servers, List<ServerName> notClearedServers)` Called after clear dead region servers.
`void`	`postCloneSnapshot(ObserverContext<MasterCoprocessorEnvironment> ctx, org.apache.hadoop.hbase.protobuf.generated.HBaseProtos.SnapshotDescription snapshot, HTableDescriptor hTableDescriptor)` Called after a snapshot clone operation has been requested.
`void`	`postCreateNamespace(ObserverContext<MasterCoprocessorEnvironment> ctx, NamespaceDescriptor ns)` Called after the createNamespace operation has been requested.
`void`	`postCreateTable(ObserverContext<MasterCoprocessorEnvironment> ctx, HTableDescriptor desc, HRegionInfo[] regions)` Called after the createTable operation has been requested.
`void`	`postCreateTableHandler(ObserverContext<MasterCoprocessorEnvironment> ctx, HTableDescriptor desc, HRegionInfo[] regions)` Called after the createTable operation has been requested.
`void`	`postDeleteColumn(ObserverContext<MasterCoprocessorEnvironment> ctx, TableName tableName, byte[] c)` Called after the column family has been deleted.
`void`	`postDeleteColumnHandler(ObserverContext<MasterCoprocessorEnvironment> ctx, TableName tableName, byte[] c)` Called after the column family has been deleted.
`void`	`postDeleteNamespace(ObserverContext<MasterCoprocessorEnvironment> ctx, String namespace)` Called after the deleteNamespace operation has been requested.
`void`	`postDeleteSnapshot(ObserverContext<MasterCoprocessorEnvironment> ctx, org.apache.hadoop.hbase.protobuf.generated.HBaseProtos.SnapshotDescription snapshot)` Called after the delete snapshot operation has been requested.
`void`	`postDeleteTable(ObserverContext<MasterCoprocessorEnvironment> ctx, TableName tableName)` Called after the deleteTable operation has been requested.
`void`	`postDeleteTableHandler(ObserverContext<MasterCoprocessorEnvironment> ctx, TableName tableName)` Called after `HMaster` deletes a table.
`void`	`postDisableTable(ObserverContext<MasterCoprocessorEnvironment> ctx, TableName tableName)` Called after the disableTable operation has been requested.
`void`	`postDisableTableHandler(ObserverContext<MasterCoprocessorEnvironment> ctx, TableName tableName)` Called after the disableTable operation has been requested.
`void`	`postDispatchMerge(ObserverContext<MasterCoprocessorEnvironment> c, HRegionInfo regionA, HRegionInfo regionB)` called after dispatching the region merge request.
`void`	`postEnableTable(ObserverContext<MasterCoprocessorEnvironment> ctx, TableName tableName)` Called after the enableTable operation has been requested.
`void`	`postEnableTableHandler(ObserverContext<MasterCoprocessorEnvironment> ctx, TableName tableName)` Called after the enableTable operation has been requested.
`void`	`postGetClusterStatus(ObserverContext<MasterCoprocessorEnvironment> ctx, ClusterStatus status)` Called after get cluster status.
`void`	`postGetNamespaceDescriptor(ObserverContext<MasterCoprocessorEnvironment> ctx, NamespaceDescriptor ns)` Called after a getNamespaceDescriptor request has been processed.
`void`	`postGetTableDescriptors(ObserverContext<MasterCoprocessorEnvironment> ctx, List<HTableDescriptor> descriptors)` 已过时。 Use postGetTableDescriptors with regex instead.
`void`	`postGetTableDescriptors(ObserverContext<MasterCoprocessorEnvironment> ctx, List<TableName> tableNamesList, List<HTableDescriptor> descriptors, String regex)` Called after a getTableDescriptors request has been processed.
`void`	`postGetTableNames(ObserverContext<MasterCoprocessorEnvironment> ctx, List<HTableDescriptor> descriptors, String regex)` Called after a getTableNames request has been processed.
`void`	`postListNamespaceDescriptors(ObserverContext<MasterCoprocessorEnvironment> ctx, List<NamespaceDescriptor> descriptors)` Called after a listNamespaceDescriptors request has been processed.
`void`	`postListProcedures(ObserverContext<MasterCoprocessorEnvironment> ctx, List<ProcedureInfo> procInfoList)` Called after a listProcedures request has been processed.
`void`	`postListSnapshot(ObserverContext<MasterCoprocessorEnvironment> ctx, org.apache.hadoop.hbase.protobuf.generated.HBaseProtos.SnapshotDescription snapshot)` Called after listSnapshots request has been processed.
`void`	`postModifyColumn(ObserverContext<MasterCoprocessorEnvironment> ctx, TableName tableName, HColumnDescriptor descriptor)` Called after the column family has been updated.
`void`	`postModifyColumnHandler(ObserverContext<MasterCoprocessorEnvironment> ctx, TableName tableName, HColumnDescriptor descriptor)` Called after the column family has been updated.
`void`	`postModifyNamespace(ObserverContext<MasterCoprocessorEnvironment> ctx, NamespaceDescriptor ns)` Called after the modifyNamespace operation has been requested.
`void`	`postModifyTable(ObserverContext<MasterCoprocessorEnvironment> ctx, TableName tableName, HTableDescriptor htd)` Called after the modifyTable operation has been requested.
`void`	`postModifyTableHandler(ObserverContext<MasterCoprocessorEnvironment> ctx, TableName tableName, HTableDescriptor htd)` Called after to modifying a table's properties.
`void`	`postMove(ObserverContext<MasterCoprocessorEnvironment> ctx, HRegionInfo region, ServerName srcServer, ServerName destServer)` Called after the region move has been requested.
`void`	`postMoveServers(ObserverContext<MasterCoprocessorEnvironment> ctx, Set<Address> servers, String targetGroup)` Called after servers are moved to target region server group
`void`	`postMoveServersAndTables(ObserverContext<MasterCoprocessorEnvironment> ctx, Set<Address> servers, Set<TableName> tables, String targetGroup)` Called after servers are moved to target region server group
`void`	`postMoveTables(ObserverContext<MasterCoprocessorEnvironment> ctx, Set<TableName> tables, String targetGroup)` Called after servers are moved to target region server group
`void`	`postRegionOffline(ObserverContext<MasterCoprocessorEnvironment> ctx, HRegionInfo regionInfo)` Called after the region has been marked offline.
`void`	`postRemoveRSGroup(ObserverContext<MasterCoprocessorEnvironment> ctx, String name)` Called after a region server group is removed
`void`	`postRemoveServers(ObserverContext<MasterCoprocessorEnvironment> ctx, Set<Address> servers)` Called after servers are removed from rsgroup
`void`	`postRestoreSnapshot(ObserverContext<MasterCoprocessorEnvironment> ctx, org.apache.hadoop.hbase.protobuf.generated.HBaseProtos.SnapshotDescription snapshot, HTableDescriptor hTableDescriptor)` Called after a snapshot restore operation has been requested.
`void`	`postSetNamespaceQuota(ObserverContext<MasterCoprocessorEnvironment> ctx, String namespace, org.apache.hadoop.hbase.protobuf.generated.QuotaProtos.Quotas quotas)` Called after the quota for the namespace is stored.
`void`	`postSetSplitOrMergeEnabled(ObserverContext<MasterCoprocessorEnvironment> ctx, boolean newValue, Admin.MasterSwitchType switchType)` Called after setting split / merge switch
`void`	`postSetTableQuota(ObserverContext<MasterCoprocessorEnvironment> ctx, TableName tableName, org.apache.hadoop.hbase.protobuf.generated.QuotaProtos.Quotas quotas)` Called after the quota for the table is stored.
`void`	`postSetUserQuota(ObserverContext<MasterCoprocessorEnvironment> ctx, String userName, org.apache.hadoop.hbase.protobuf.generated.QuotaProtos.Quotas quotas)` Called after the quota for the user is stored.
`void`	`postSetUserQuota(ObserverContext<MasterCoprocessorEnvironment> ctx, String userName, String namespace, org.apache.hadoop.hbase.protobuf.generated.QuotaProtos.Quotas quotas)` Called after the quota for the user on the specified namespace is stored.
`void`	`postSetUserQuota(ObserverContext<MasterCoprocessorEnvironment> ctx, String userName, TableName tableName, org.apache.hadoop.hbase.protobuf.generated.QuotaProtos.Quotas quotas)` Called after the quota for the user on the specified table is stored.
`void`	`postSnapshot(ObserverContext<MasterCoprocessorEnvironment> ctx, org.apache.hadoop.hbase.protobuf.generated.HBaseProtos.SnapshotDescription snapshot, HTableDescriptor hTableDescriptor)` Called after the snapshot operation has been requested.
`void`	`postStartMaster(ObserverContext<MasterCoprocessorEnvironment> ctx)` Called immediately after an active master instance has completed initialization.
`void`	`postTableFlush(ObserverContext<MasterCoprocessorEnvironment> ctx, TableName tableName)` Called after the table memstore is flushed to disk.
`void`	`postTruncateTable(ObserverContext<MasterCoprocessorEnvironment> ctx, TableName tableName)` Called after the truncateTable operation has been requested.
`void`	`postTruncateTableHandler(ObserverContext<MasterCoprocessorEnvironment> ctx, TableName tableName)` Called after `HMaster` truncates a table.
`void`	`postUnassign(ObserverContext<MasterCoprocessorEnvironment> ctx, HRegionInfo regionInfo, boolean force)` Called after the region unassignment has been requested.
`void`	`preAbortProcedure(ObserverContext<MasterCoprocessorEnvironment> ctx, ProcedureExecutor<MasterProcedureEnv> procEnv, long procId)` Called before a abortProcedure request has been processed.
`void`	`preAddColumn(ObserverContext<MasterCoprocessorEnvironment> ctx, TableName tableName, HColumnDescriptor column)` Called prior to adding a new column family to the table.
`void`	`preAddColumnHandler(ObserverContext<MasterCoprocessorEnvironment> ctx, TableName tableName, HColumnDescriptor column)` Called prior to adding a new column family to the table.
`void`	`preAddRSGroup(ObserverContext<MasterCoprocessorEnvironment> ctx, String name)` Called before a new region server group is added
`void`	`preAssign(ObserverContext<MasterCoprocessorEnvironment> ctx, HRegionInfo regionInfo)` Called prior to assigning a specific region.
`void`	`preBalance(ObserverContext<MasterCoprocessorEnvironment> ctx)` Called prior to requesting rebalancing of the cluster regions, though after the initial checks for regions in transition and the balance switch flag.
`void`	`preBalanceRSGroup(ObserverContext<MasterCoprocessorEnvironment> ctx, String groupName)` Called before a region server group is removed
`boolean`	`preBalanceSwitch(ObserverContext<MasterCoprocessorEnvironment> ctx, boolean newValue)` Called prior to modifying the flag used to enable/disable region balancing.
`void`	`preClearDeadServers(ObserverContext<MasterCoprocessorEnvironment> ctx)` Called before clear dead region servers.
`void`	`preCloneSnapshot(ObserverContext<MasterCoprocessorEnvironment> ctx, org.apache.hadoop.hbase.protobuf.generated.HBaseProtos.SnapshotDescription snapshot, HTableDescriptor hTableDescriptor)` Called before a snapshot is cloned.
`void`	`preCreateNamespace(ObserverContext<MasterCoprocessorEnvironment> ctx, NamespaceDescriptor ns)` Called before a new namespace is created by `HMaster`.
`void`	`preCreateTable(ObserverContext<MasterCoprocessorEnvironment> ctx, HTableDescriptor desc, HRegionInfo[] regions)` Called before a new table is created by `HMaster`.
`void`	`preCreateTableHandler(ObserverContext<MasterCoprocessorEnvironment> ctx, HTableDescriptor desc, HRegionInfo[] regions)` Called before a new table is created by `HMaster`.
`void`	`preDeleteColumn(ObserverContext<MasterCoprocessorEnvironment> ctx, TableName tableName, byte[] c)` Called prior to deleting the entire column family.
`void`	`preDeleteColumnHandler(ObserverContext<MasterCoprocessorEnvironment> ctx, TableName tableName, byte[] c)` Called prior to deleting the entire column family.
`void`	`preDeleteNamespace(ObserverContext<MasterCoprocessorEnvironment> ctx, String namespace)` Called before `HMaster` deletes a namespace It can't bypass the default action, e.g., ctx.bypass() won't have effect.
`void`	`preDeleteSnapshot(ObserverContext<MasterCoprocessorEnvironment> ctx, org.apache.hadoop.hbase.protobuf.generated.HBaseProtos.SnapshotDescription snapshot)` Called before a snapshot is deleted.
`void`	`preDeleteTable(ObserverContext<MasterCoprocessorEnvironment> ctx, TableName tableName)` Called before `HMaster` deletes a table.
`void`	`preDeleteTableHandler(ObserverContext<MasterCoprocessorEnvironment> ctx, TableName tableName)` Called before `HMaster` deletes a table.
`void`	`preDisableTable(ObserverContext<MasterCoprocessorEnvironment> ctx, TableName tableName)` Called prior to disabling a table.
`void`	`preDisableTableHandler(ObserverContext<MasterCoprocessorEnvironment> ctx, TableName tableName)` Called prior to disabling a table.
`void`	`preDispatchMerge(ObserverContext<MasterCoprocessorEnvironment> ctx, HRegionInfo regionA, HRegionInfo regionB)` Called before dispatching region merge request.
`void`	`preEnableTable(ObserverContext<MasterCoprocessorEnvironment> ctx, TableName tableName)` Called prior to enabling a table.
`void`	`preEnableTableHandler(ObserverContext<MasterCoprocessorEnvironment> ctx, TableName tableName)` Called prior to enabling a table.
`void`	`preGetClusterStatus(ObserverContext<MasterCoprocessorEnvironment> ctx)` Called before get cluster status.
`void`	`preGetNamespaceDescriptor(ObserverContext<MasterCoprocessorEnvironment> ctx, String namespace)` Called before a getNamespaceDescriptor request has been processed.
`void`	`preGetTableDescriptors(ObserverContext<MasterCoprocessorEnvironment> ctx, List<TableName> tableNamesList, List<HTableDescriptor> descriptors)` 已过时。 Use preGetTableDescriptors with regex instead.
`void`	`preGetTableDescriptors(ObserverContext<MasterCoprocessorEnvironment> ctx, List<TableName> tableNamesList, List<HTableDescriptor> descriptors, String regex)` Called before a getTableDescriptors request has been processed.
`void`	`preGetTableNames(ObserverContext<MasterCoprocessorEnvironment> ctx, List<HTableDescriptor> descriptors, String regex)` Called before a getTableNames request has been processed.
`void`	`preListNamespaceDescriptors(ObserverContext<MasterCoprocessorEnvironment> ctx, List<NamespaceDescriptor> descriptors)` Called before a listNamespaceDescriptors request has been processed.
`void`	`preListProcedures(ObserverContext<MasterCoprocessorEnvironment> ctx)` Called before a listProcedures request has been processed.
`void`	`preListSnapshot(ObserverContext<MasterCoprocessorEnvironment> ctx, org.apache.hadoop.hbase.protobuf.generated.HBaseProtos.SnapshotDescription snapshot)` Called before listSnapshots request has been processed.
`void`	`preMasterInitialization(ObserverContext<MasterCoprocessorEnvironment> ctx)` Call before the master initialization is set to true.
`void`	`preModifyColumn(ObserverContext<MasterCoprocessorEnvironment> ctx, TableName tableName, HColumnDescriptor descriptor)` Called prior to modifying a column family's attributes.
`void`	`preModifyColumnHandler(ObserverContext<MasterCoprocessorEnvironment> ctx, TableName tableName, HColumnDescriptor descriptor)` Called prior to modifying a column family's attributes.
`void`	`preModifyNamespace(ObserverContext<MasterCoprocessorEnvironment> ctx, NamespaceDescriptor ns)` Called prior to modifying a namespace's properties.
`void`	`preModifyTable(ObserverContext<MasterCoprocessorEnvironment> ctx, TableName tableName, HTableDescriptor htd)` Called prior to modifying a table's properties.
`void`	`preModifyTableHandler(ObserverContext<MasterCoprocessorEnvironment> ctx, TableName tableName, HTableDescriptor htd)` Called prior to modifying a table's properties.
`void`	`preMove(ObserverContext<MasterCoprocessorEnvironment> ctx, HRegionInfo region, ServerName srcServer, ServerName destServer)` Called prior to moving a given region from one region server to another.
`void`	`preMoveServers(ObserverContext<MasterCoprocessorEnvironment> ctx, Set<Address> servers, String targetGroup)` Called before servers are moved to target region server group
`void`	`preMoveServersAndTables(ObserverContext<MasterCoprocessorEnvironment> ctx, Set<Address> servers, Set<TableName> tables, String targetGroup)` Called before servers are moved to target region server group
`void`	`preMoveTables(ObserverContext<MasterCoprocessorEnvironment> ctx, Set<TableName> tables, String targetGroup)` Called before tables are moved to target region server group
`void`	`preRegionOffline(ObserverContext<MasterCoprocessorEnvironment> ctx, HRegionInfo regionInfo)` Called prior to marking a given region as offline.
`void`	`preRemoveRSGroup(ObserverContext<MasterCoprocessorEnvironment> ctx, String name)` Called before a region server group is removed
`void`	`preRemoveServers(ObserverContext<MasterCoprocessorEnvironment> ctx, Set<Address> servers)` Called before servers are removed from rsgroup
`void`	`preRestoreSnapshot(ObserverContext<MasterCoprocessorEnvironment> ctx, org.apache.hadoop.hbase.protobuf.generated.HBaseProtos.SnapshotDescription snapshot, HTableDescriptor hTableDescriptor)` Called before a snapshot is restored.
`void`	`preSetNamespaceQuota(ObserverContext<MasterCoprocessorEnvironment> ctx, String namespace, org.apache.hadoop.hbase.protobuf.generated.QuotaProtos.Quotas quotas)` Called before the quota for the namespace is stored.
`boolean`	`preSetSplitOrMergeEnabled(ObserverContext<MasterCoprocessorEnvironment> ctx, boolean newValue, Admin.MasterSwitchType switchType)` Called prior to setting split / merge switch
`void`	`preSetTableQuota(ObserverContext<MasterCoprocessorEnvironment> ctx, TableName tableName, org.apache.hadoop.hbase.protobuf.generated.QuotaProtos.Quotas quotas)` Called before the quota for the table is stored.
`void`	`preSetUserQuota(ObserverContext<MasterCoprocessorEnvironment> ctx, String userName, org.apache.hadoop.hbase.protobuf.generated.QuotaProtos.Quotas quotas)` Called before the quota for the user is stored.
`void`	`preSetUserQuota(ObserverContext<MasterCoprocessorEnvironment> ctx, String userName, String namespace, org.apache.hadoop.hbase.protobuf.generated.QuotaProtos.Quotas quotas)` Called before the quota for the user on the specified namespace is stored.
`void`	`preSetUserQuota(ObserverContext<MasterCoprocessorEnvironment> ctx, String userName, TableName tableName, org.apache.hadoop.hbase.protobuf.generated.QuotaProtos.Quotas quotas)` Called before the quota for the user on the specified table is stored.
`void`	`preShutdown(ObserverContext<MasterCoprocessorEnvironment> ctx)` Called prior to shutting down the full HBase cluster, including this `HMaster` process.
`void`	`preSnapshot(ObserverContext<MasterCoprocessorEnvironment> ctx, org.apache.hadoop.hbase.protobuf.generated.HBaseProtos.SnapshotDescription snapshot, HTableDescriptor hTableDescriptor)` Called before a new snapshot is taken.
`void`	`preStopMaster(ObserverContext<MasterCoprocessorEnvironment> ctx)` Called immediately prior to stopping this `HMaster` process.
`void`	`preTableFlush(ObserverContext<MasterCoprocessorEnvironment> ctx, TableName tableName)` Called before the table memstore is flushed to disk.
`void`	`preTruncateTable(ObserverContext<MasterCoprocessorEnvironment> ctx, TableName tableName)` Called before `HMaster` truncates a table.
`void`	`preTruncateTableHandler(ObserverContext<MasterCoprocessorEnvironment> ctx, TableName tableName)` Called before `HMaster` truncates a table.
`void`	`preUnassign(ObserverContext<MasterCoprocessorEnvironment> ctx, HRegionInfo regionInfo, boolean force)` Called prior to unassigning a given region.

从接口继承的方法 org.apache.hadoop.hbase.Coprocessor
start, stop

- 方法详细资料
  - preCreateTable
```
void preCreateTable(ObserverContext<MasterCoprocessorEnvironment> ctx,
                  HTableDescriptor desc,
                  HRegionInfo[] regions)
                    throws IOException
```
    Called before a new table is created by HMaster. Called as part of create table RPC call. It can't bypass the default action, e.g., ctx.bypass() won't have effect.
    
    参数:
    ctx - the environment to interact with the framework and master
    desc - the HTableDescriptor for the table
    regions - the initial regions created for the table
    
    抛出:
    
    IOException
  - postCreateTable
```
void postCreateTable(ObserverContext<MasterCoprocessorEnvironment> ctx,
                   HTableDescriptor desc,
                   HRegionInfo[] regions)
                     throws IOException
```
    Called after the createTable operation has been requested. Called as part of create table RPC call.
    
    参数:
    ctx - the environment to interact with the framework and master
    desc - the HTableDescriptor for the table
    regions - the initial regions created for the table
    
    抛出:
    
    IOException
  - preCreateTableHandler
```
void preCreateTableHandler(ObserverContext<MasterCoprocessorEnvironment> ctx,
                         HTableDescriptor desc,
                         HRegionInfo[] regions)
                           throws IOException
```
    Called before a new table is created by HMaster. Called as part of create table handler and it is async to the create RPC call. It can't bypass the default action, e.g., ctx.bypass() won't have effect.
    
    参数:
    ctx - the environment to interact with the framework and master
    desc - the HTableDescriptor for the table
    regions - the initial regions created for the table
    
    抛出:
    
    IOException
  - postCreateTableHandler
```
void postCreateTableHandler(ObserverContext<MasterCoprocessorEnvironment> ctx,
                          HTableDescriptor desc,
                          HRegionInfo[] regions)
                            throws IOException
```
    Called after the createTable operation has been requested. Called as part of create table RPC call. Called as part of create table handler and it is async to the create RPC call.
    
    参数:
    ctx - the environment to interact with the framework and master
    desc - the HTableDescriptor for the table
    regions - the initial regions created for the table
    
    抛出:
    
    IOException
  - preDeleteTable
```
void preDeleteTable(ObserverContext<MasterCoprocessorEnvironment> ctx,
                  TableName tableName)
                    throws IOException
```
    Called before HMaster deletes a table. Called as part of delete table RPC call. It can't bypass the default action, e.g., ctx.bypass() won't have effect.
    
    参数:
    ctx - the environment to interact with the framework and master
    tableName - the name of the table
    
    抛出:
    
    IOException
  - postDeleteTable
```
void postDeleteTable(ObserverContext<MasterCoprocessorEnvironment> ctx,
                   TableName tableName)
                     throws IOException
```
    Called after the deleteTable operation has been requested. Called as part of delete table RPC call.
    
    参数:
    ctx - the environment to interact with the framework and master
    tableName - the name of the table
    
    抛出:
    
    IOException
  - preDeleteTableHandler
```
void preDeleteTableHandler(ObserverContext<MasterCoprocessorEnvironment> ctx,
                         TableName tableName)
                           throws IOException
```
    Called before HMaster deletes a table. Called as part of delete table handler and it is async to the delete RPC call. It can't bypass the default action, e.g., ctx.bypass() won't have effect.
    
    参数:
    ctx - the environment to interact with the framework and master
    tableName - the name of the table
    
    抛出:
    
    IOException
  - postDeleteTableHandler
```
void postDeleteTableHandler(ObserverContext<MasterCoprocessorEnvironment> ctx,
                          TableName tableName)
                            throws IOException
```
    Called after HMaster deletes a table. Called as part of delete table handler and it is async to the delete RPC call. It can't bypass the default action, e.g., ctx.bypass() won't have effect.
    
    参数:
    ctx - the environment to interact with the framework and master
    tableName - the name of the table
    
    抛出:
    
    IOException
  - preTruncateTable
```
void preTruncateTable(ObserverContext<MasterCoprocessorEnvironment> ctx,
                    TableName tableName)
                      throws IOException
```
    Called before HMaster truncates a table. Called as part of truncate table RPC call. It can't bypass the default action, e.g., ctx.bypass() won't have effect.
    
    参数:
    ctx - the environment to interact with the framework and master
    tableName - the name of the table
    
    抛出:
    
    IOException
  - postTruncateTable
```
void postTruncateTable(ObserverContext<MasterCoprocessorEnvironment> ctx,
                     TableName tableName)
                       throws IOException
```
    Called after the truncateTable operation has been requested. Called as part of truncate table RPC call. The truncate is synchronous, so this method will be called when the truncate operation is terminated.
    
    参数:
    ctx - the environment to interact with the framework and master
    tableName - the name of the table
    
    抛出:
    
    IOException
  - preTruncateTableHandler
```
void preTruncateTableHandler(ObserverContext<MasterCoprocessorEnvironment> ctx,
                           TableName tableName)
                             throws IOException
```
    Called before HMaster truncates a table. Called as part of truncate table handler and it is sync to the truncate RPC call. It can't bypass the default action, e.g., ctx.bypass() won't have effect.
    
    参数:
    ctx - the environment to interact with the framework and master
    tableName - the name of the table
    
    抛出:
    
    IOException
  - postTruncateTableHandler
```
void postTruncateTableHandler(ObserverContext<MasterCoprocessorEnvironment> ctx,
                            TableName tableName)
                              throws IOException
```
    Called after HMaster truncates a table. Called as part of truncate table handler and it is sync to the truncate RPC call. It can't bypass the default action, e.g., ctx.bypass() won't have effect.
    
    参数:
    ctx - the environment to interact with the framework and master
    tableName - the name of the table
    
    抛出:
    
    IOException
  - preModifyTable
```
void preModifyTable(ObserverContext<MasterCoprocessorEnvironment> ctx,
                  TableName tableName,
                  HTableDescriptor htd)
                    throws IOException
```
    Called prior to modifying a table's properties. Called as part of modify table RPC call. It can't bypass the default action, e.g., ctx.bypass() won't have effect.
    
    参数:
    ctx - the environment to interact with the framework and master
    tableName - the name of the table
    htd - the HTableDescriptor
    
    抛出:
    
    IOException
  - postModifyTable
```
void postModifyTable(ObserverContext<MasterCoprocessorEnvironment> ctx,
                   TableName tableName,
                   HTableDescriptor htd)
                     throws IOException
```
    Called after the modifyTable operation has been requested. Called as part of modify table RPC call.
    
    参数:
    ctx - the environment to interact with the framework and master
    tableName - the name of the table
    htd - the HTableDescriptor
    
    抛出:
    
    IOException
  - preModifyTableHandler
```
void preModifyTableHandler(ObserverContext<MasterCoprocessorEnvironment> ctx,
                         TableName tableName,
                         HTableDescriptor htd)
                           throws IOException
```
    Called prior to modifying a table's properties. Called as part of modify table handler and it is async to the modify table RPC call. It can't bypass the default action, e.g., ctx.bypass() won't have effect.
    
    参数:
    ctx - the environment to interact with the framework and master
    tableName - the name of the table
    htd - the HTableDescriptor
    
    抛出:
    
    IOException
  - postModifyTableHandler
```
void postModifyTableHandler(ObserverContext<MasterCoprocessorEnvironment> ctx,
                          TableName tableName,
                          HTableDescriptor htd)
                            throws IOException
```
    Called after to modifying a table's properties. Called as part of modify table handler and it is async to the modify table RPC call. It can't bypass the default action, e.g., ctx.bypass() won't have effect.
    
    参数:
    ctx - the environment to interact with the framework and master
    tableName - the name of the table
    htd - the HTableDescriptor
    
    抛出:
    
    IOException
  - preAddColumn
```
void preAddColumn(ObserverContext<MasterCoprocessorEnvironment> ctx,
                TableName tableName,
                HColumnDescriptor column)
                  throws IOException
```
    Called prior to adding a new column family to the table. Called as part of add column RPC call.
    
    参数:
    ctx - the environment to interact with the framework and master
    tableName - the name of the table
    column - the HColumnDescriptor
    
    抛出:
    
    IOException
  - postAddColumn
```
void postAddColumn(ObserverContext<MasterCoprocessorEnvironment> ctx,
                 TableName tableName,
                 HColumnDescriptor column)
                   throws IOException
```
    Called after the new column family has been created. Called as part of add column RPC call.
    
    参数:
    ctx - the environment to interact with the framework and master
    tableName - the name of the table
    column - the HColumnDescriptor
    
    抛出:
    
    IOException
  - preAddColumnHandler
```
void preAddColumnHandler(ObserverContext<MasterCoprocessorEnvironment> ctx,
                       TableName tableName,
                       HColumnDescriptor column)
                         throws IOException
```
    Called prior to adding a new column family to the table. Called as part of add column handler.
    
    参数:
    ctx - the environment to interact with the framework and master
    tableName - the name of the table
    column - the HColumnDescriptor
    
    抛出:
    
    IOException
  - postAddColumnHandler
```
void postAddColumnHandler(ObserverContext<MasterCoprocessorEnvironment> ctx,
                        TableName tableName,
                        HColumnDescriptor column)
                          throws IOException
```
    Called after the new column family has been created. Called as part of add column handler.
    
    参数:
    ctx - the environment to interact with the framework and master
    tableName - the name of the table
    column - the HColumnDescriptor
    
    抛出:
    
    IOException
  - preModifyColumn
```
void preModifyColumn(ObserverContext<MasterCoprocessorEnvironment> ctx,
                   TableName tableName,
                   HColumnDescriptor descriptor)
                     throws IOException
```
    Called prior to modifying a column family's attributes. Called as part of modify column RPC call.
    
    参数:
    ctx - the environment to interact with the framework and master
    tableName - the name of the table
    descriptor - the HColumnDescriptor
    
    抛出:
    
    IOException
  - postModifyColumn
```
void postModifyColumn(ObserverContext<MasterCoprocessorEnvironment> ctx,
                    TableName tableName,
                    HColumnDescriptor descriptor)
                      throws IOException
```
    Called after the column family has been updated. Called as part of modify column RPC call.
    
    参数:
    ctx - the environment to interact with the framework and master
    tableName - the name of the table
    descriptor - the HColumnDescriptor
    
    抛出:
    
    IOException
  - preModifyColumnHandler
```
void preModifyColumnHandler(ObserverContext<MasterCoprocessorEnvironment> ctx,
                          TableName tableName,
                          HColumnDescriptor descriptor)
                            throws IOException
```
    Called prior to modifying a column family's attributes. Called as part of modify column handler.
    
    参数:
    ctx - the environment to interact with the framework and master
    tableName - the name of the table
    descriptor - the HColumnDescriptor
    
    抛出:
    
    IOException
  - postModifyColumnHandler
```
void postModifyColumnHandler(ObserverContext<MasterCoprocessorEnvironment> ctx,
                           TableName tableName,
                           HColumnDescriptor descriptor)
                             throws IOException
```
    Called after the column family has been updated. Called as part of modify column handler.
    
    参数:
    ctx - the environment to interact with the framework and master
    tableName - the name of the table
    descriptor - the HColumnDescriptor
    
    抛出:
    
    IOException
  - preDeleteColumn
```
void preDeleteColumn(ObserverContext<MasterCoprocessorEnvironment> ctx,
                   TableName tableName,
                   byte[] c)
                     throws IOException
```
    Called prior to deleting the entire column family. Called as part of delete column RPC call.
    
    参数:
    ctx - the environment to interact with the framework and master
    tableName - the name of the table
    c - the column
    
    抛出:
    
    IOException
  - postDeleteColumn
```
void postDeleteColumn(ObserverContext<MasterCoprocessorEnvironment> ctx,
                    TableName tableName,
                    byte[] c)
                      throws IOException
```
    Called after the column family has been deleted. Called as part of delete column RPC call.
    
    参数:
    ctx - the environment to interact with the framework and master
    tableName - the name of the table
    c - the column
    
    抛出:
    
    IOException
  - preDeleteColumnHandler
```
void preDeleteColumnHandler(ObserverContext<MasterCoprocessorEnvironment> ctx,
                          TableName tableName,
                          byte[] c)
                            throws IOException
```
    Called prior to deleting the entire column family. Called as part of delete column handler.
    
    参数:
    ctx - the environment to interact with the framework and master
    tableName - the name of the table
    c - the column
    
    抛出:
    
    IOException
  - postDeleteColumnHandler
```
void postDeleteColumnHandler(ObserverContext<MasterCoprocessorEnvironment> ctx,
                           TableName tableName,
                           byte[] c)
                             throws IOException
```
    Called after the column family has been deleted. Called as part of delete column handler.
    
    参数:
    ctx - the environment to interact with the framework and master
    tableName - the name of the table
    c - the column
    
    抛出:
    
    IOException
  - preEnableTable
```
void preEnableTable(ObserverContext<MasterCoprocessorEnvironment> ctx,
                  TableName tableName)
                    throws IOException
```
    Called prior to enabling a table. Called as part of enable table RPC call. It can't bypass the default action, e.g., ctx.bypass() won't have effect.
    
    参数:
    ctx - the environment to interact with the framework and master
    tableName - the name of the table
    
    抛出:
    
    IOException
  - postEnableTable
```
void postEnableTable(ObserverContext<MasterCoprocessorEnvironment> ctx,
                   TableName tableName)
                     throws IOException
```
    Called after the enableTable operation has been requested. Called as part of enable table RPC call.
    
    参数:
    ctx - the environment to interact with the framework and master
    tableName - the name of the table
    
    抛出:
    
    IOException
  - preEnableTableHandler
```
void preEnableTableHandler(ObserverContext<MasterCoprocessorEnvironment> ctx,
                         TableName tableName)
                           throws IOException
```
    Called prior to enabling a table. Called as part of enable table handler and it is async to the enable table RPC call. It can't bypass the default action, e.g., ctx.bypass() won't have effect.
    
    参数:
    ctx - the environment to interact with the framework and master
    tableName - the name of the table
    
    抛出:
    
    IOException
  - postEnableTableHandler
```
void postEnableTableHandler(ObserverContext<MasterCoprocessorEnvironment> ctx,
                          TableName tableName)
                            throws IOException
```
    Called after the enableTable operation has been requested. Called as part of enable table handler and it is async to the enable table RPC call.
    
    参数:
    ctx - the environment to interact with the framework and master
    tableName - the name of the table
    
    抛出:
    
    IOException
  - preDisableTable
```
void preDisableTable(ObserverContext<MasterCoprocessorEnvironment> ctx,
                   TableName tableName)
                     throws IOException
```
    Called prior to disabling a table. Called as part of disable table RPC call. It can't bypass the default action, e.g., ctx.bypass() won't have effect.
    
    参数:
    ctx - the environment to interact with the framework and master
    tableName - the name of the table
    
    抛出:
    
    IOException
  - postDisableTable
```
void postDisableTable(ObserverContext<MasterCoprocessorEnvironment> ctx,
                    TableName tableName)
                      throws IOException
```
    Called after the disableTable operation has been requested. Called as part of disable table RPC call.
    
    参数:
    ctx - the environment to interact with the framework and master
    tableName - the name of the table
    
    抛出:
    
    IOException
  - preDisableTableHandler
```
void preDisableTableHandler(ObserverContext<MasterCoprocessorEnvironment> ctx,
                          TableName tableName)
                            throws IOException
```
    Called prior to disabling a table. Called as part of disable table handler and it is asyn to the disable table RPC call. It can't bypass the default action, e.g., ctx.bypass() won't have effect.
    
    参数:
    ctx - the environment to interact with the framework and master
    tableName - the name of the table
    
    抛出:
    
    IOException
  - postDisableTableHandler
```
void postDisableTableHandler(ObserverContext<MasterCoprocessorEnvironment> ctx,
                           TableName tableName)
                             throws IOException
```
    Called after the disableTable operation has been requested. Called as part of disable table handler and it is asyn to the disable table RPC call.
    
    参数:
    ctx - the environment to interact with the framework and master
    tableName - the name of the table
    
    抛出:
    
    IOException
  - preMove
```
void preMove(ObserverContext<MasterCoprocessorEnvironment> ctx,
           HRegionInfo region,
           ServerName srcServer,
           ServerName destServer)
             throws IOException
```
    Called prior to moving a given region from one region server to another.
    
    参数:
    ctx - the environment to interact with the framework and master
    region - the HRegionInfo
    srcServer - the source ServerName
    destServer - the destination ServerName
    
    抛出:
    
    IOException
  - postMove
```
void postMove(ObserverContext<MasterCoprocessorEnvironment> ctx,
            HRegionInfo region,
            ServerName srcServer,
            ServerName destServer)
              throws IOException
```
    Called after the region move has been requested.
    
    参数:
    ctx - the environment to interact with the framework and master
    region - the HRegionInfo
    srcServer - the source ServerName
    destServer - the destination ServerName
    
    抛出:
    
    IOException
  - preAbortProcedure
```
void preAbortProcedure(ObserverContext<MasterCoprocessorEnvironment> ctx,
                     ProcedureExecutor<MasterProcedureEnv> procEnv,
                     long procId)
                       throws IOException
```
    Called before a abortProcedure request has been processed.
    
    参数:
    ctx - the environment to interact with the framework and master
    
    抛出:
    
    IOException
  - postAbortProcedure
```
void postAbortProcedure(ObserverContext<MasterCoprocessorEnvironment> ctx)
                        throws IOException
```
    Called after a abortProcedure request has been processed.
    
    参数:
    ctx - the environment to interact with the framework and master
    
    抛出:
    
    IOException
  - preListProcedures
```
void preListProcedures(ObserverContext<MasterCoprocessorEnvironment> ctx)
                       throws IOException
```
    Called before a listProcedures request has been processed.
    
    参数:
    ctx - the environment to interact with the framework and master
    
    抛出:
    
    IOException
  - postListProcedures
```
void postListProcedures(ObserverContext<MasterCoprocessorEnvironment> ctx,
                      List<ProcedureInfo> procInfoList)
                        throws IOException
```
    Called after a listProcedures request has been processed.
    
    参数:
    ctx - the environment to interact with the framework and master
    procInfoList - the list of procedures about to be returned
    
    抛出:
    
    IOException
  - preAssign
```
void preAssign(ObserverContext<MasterCoprocessorEnvironment> ctx,
             HRegionInfo regionInfo)
               throws IOException
```
    Called prior to assigning a specific region.
    
    参数:
    ctx - the environment to interact with the framework and master
    regionInfo - the regionInfo of the region
    
    抛出:
    
    IOException
  - postAssign
```
void postAssign(ObserverContext<MasterCoprocessorEnvironment> ctx,
              HRegionInfo regionInfo)
                throws IOException
```
    Called after the region assignment has been requested.
    
    参数:
    ctx - the environment to interact with the framework and master
    regionInfo - the regionInfo of the region
    
    抛出:
    
    IOException
  - preUnassign
```
void preUnassign(ObserverContext<MasterCoprocessorEnvironment> ctx,
               HRegionInfo regionInfo,
               boolean force)
                 throws IOException
```
    Called prior to unassigning a given region.
    
    参数:
    ctx - the environment to interact with the framework and master
    regionInfo -
    force - whether to force unassignment or not
    
    抛出:
    
    IOException
  - postUnassign
```
void postUnassign(ObserverContext<MasterCoprocessorEnvironment> ctx,
                HRegionInfo regionInfo,
                boolean force)
                  throws IOException
```
    Called after the region unassignment has been requested.
    
    参数:
    ctx - the environment to interact with the framework and master
    regionInfo -
    force - whether to force unassignment or not
    
    抛出:
    
    IOException
  - preRegionOffline
```
void preRegionOffline(ObserverContext<MasterCoprocessorEnvironment> ctx,
                    HRegionInfo regionInfo)
                      throws IOException
```
    Called prior to marking a given region as offline. ctx.bypass() will not have any impact on this hook.
    
    参数:
    ctx - the environment to interact with the framework and master
    regionInfo -
    
    抛出:
    
    IOException
  - postRegionOffline
```
void postRegionOffline(ObserverContext<MasterCoprocessorEnvironment> ctx,
                     HRegionInfo regionInfo)
                       throws IOException
```
    Called after the region has been marked offline.
    
    参数:
    ctx - the environment to interact with the framework and master
    regionInfo -
    
    抛出:
    
    IOException
  - preBalance
```
void preBalance(ObserverContext<MasterCoprocessorEnvironment> ctx)
                throws IOException
```
    Called prior to requesting rebalancing of the cluster regions, though after the initial checks for regions in transition and the balance switch flag.
    
    参数:
    ctx - the environment to interact with the framework and master
    
    抛出:
    
    IOException
  - postBalance
```
void postBalance(ObserverContext<MasterCoprocessorEnvironment> ctx,
               List<RegionPlan> plans)
                 throws IOException
```
    Called after the balancing plan has been submitted.
    
    参数:
    ctx - the environment to interact with the framework and master
    plans - the RegionPlans which master has executed. RegionPlan serves as hint as for the final destination for the underlying region but may not represent the final state of assignment
    
    抛出:
    
    IOException
  - preSetSplitOrMergeEnabled
```
boolean preSetSplitOrMergeEnabled(ObserverContext<MasterCoprocessorEnvironment> ctx,
                                boolean newValue,
                                Admin.MasterSwitchType switchType)
                                  throws IOException
```
    Called prior to setting split / merge switch
    
    参数:
    ctx - the coprocessor instance's environment
    newValue - the new value submitted in the call
    switchType - type of switch
    
    抛出:
    
    IOException
  - postSetSplitOrMergeEnabled
```
void postSetSplitOrMergeEnabled(ObserverContext<MasterCoprocessorEnvironment> ctx,
                              boolean newValue,
                              Admin.MasterSwitchType switchType)
                                throws IOException
```
    Called after setting split / merge switch
    
    参数:
    ctx - the coprocessor instance's environment
    newValue - the new value submitted in the call
    switchType - type of switch
    
    抛出:
    
    IOException
  - preBalanceSwitch
```
boolean preBalanceSwitch(ObserverContext<MasterCoprocessorEnvironment> ctx,
                       boolean newValue)
                         throws IOException
```
    Called prior to modifying the flag used to enable/disable region balancing.
    
    参数:
    ctx - the coprocessor instance's environment
    newValue - the new flag value submitted in the call
    
    抛出:
    
    IOException
  - postBalanceSwitch
```
void postBalanceSwitch(ObserverContext<MasterCoprocessorEnvironment> ctx,
                     boolean oldValue,
                     boolean newValue)
                       throws IOException
```
    Called after the flag to enable/disable balancing has changed.
    
    参数:
    ctx - the coprocessor instance's environment
    oldValue - the previously set balanceSwitch value
    newValue - the newly set balanceSwitch value
    
    抛出:
    
    IOException
  - preShutdown
```
void preShutdown(ObserverContext<MasterCoprocessorEnvironment> ctx)
                 throws IOException
```
    Called prior to shutting down the full HBase cluster, including this HMaster process.
    
    抛出:
    
    IOException
  - preStopMaster
```
void preStopMaster(ObserverContext<MasterCoprocessorEnvironment> ctx)
                   throws IOException
```
    Called immediately prior to stopping this HMaster process.
    
    抛出:
    
    IOException
  - postStartMaster
```
void postStartMaster(ObserverContext<MasterCoprocessorEnvironment> ctx)
                     throws IOException
```
    Called immediately after an active master instance has completed initialization. Will not be called on standby master instances unless they take over the active role.
    
    抛出:
    
    IOException
  - preMasterInitialization
```
void preMasterInitialization(ObserverContext<MasterCoprocessorEnvironment> ctx)
                             throws IOException
```
    Call before the master initialization is set to true. HMaster process.
    
    抛出:
    
    IOException
  - preSnapshot
```
void preSnapshot(ObserverContext<MasterCoprocessorEnvironment> ctx,
               org.apache.hadoop.hbase.protobuf.generated.HBaseProtos.SnapshotDescription snapshot,
               HTableDescriptor hTableDescriptor)
                 throws IOException
```
    Called before a new snapshot is taken. Called as part of snapshot RPC call. It can't bypass the default action, e.g., ctx.bypass() won't have effect.
    
    参数:
    ctx - the environment to interact with the framework and master
    snapshot - the SnapshotDescriptor for the snapshot
    hTableDescriptor - the hTableDescriptor of the table to snapshot
    
    抛出:
    
    IOException
  - postSnapshot
```
void postSnapshot(ObserverContext<MasterCoprocessorEnvironment> ctx,
                org.apache.hadoop.hbase.protobuf.generated.HBaseProtos.SnapshotDescription snapshot,
                HTableDescriptor hTableDescriptor)
                  throws IOException
```
    Called after the snapshot operation has been requested. Called as part of snapshot RPC call.
    
    参数:
    ctx - the environment to interact with the framework and master
    snapshot - the SnapshotDescriptor for the snapshot
    hTableDescriptor - the hTableDescriptor of the table to snapshot
    
    抛出:
    
    IOException
  - preListSnapshot
```
void preListSnapshot(ObserverContext<MasterCoprocessorEnvironment> ctx,
                   org.apache.hadoop.hbase.protobuf.generated.HBaseProtos.SnapshotDescription snapshot)
                     throws IOException
```
    Called before listSnapshots request has been processed. It can't bypass the default action, e.g., ctx.bypass() won't have effect.
    
    参数:
    ctx - the environment to interact with the framework and master
    snapshot - the SnapshotDescriptor of the snapshot to list
    
    抛出:
    
    IOException
  - postListSnapshot
```
void postListSnapshot(ObserverContext<MasterCoprocessorEnvironment> ctx,
                    org.apache.hadoop.hbase.protobuf.generated.HBaseProtos.SnapshotDescription snapshot)
                      throws IOException
```
    Called after listSnapshots request has been processed. It can't bypass the default action, e.g., ctx.bypass() won't have effect.
    
    参数:
    ctx - the environment to interact with the framework and master
    snapshot - the SnapshotDescriptor of the snapshot to list
    
    抛出:
    
    IOException
  - preCloneSnapshot
```
void preCloneSnapshot(ObserverContext<MasterCoprocessorEnvironment> ctx,
                    org.apache.hadoop.hbase.protobuf.generated.HBaseProtos.SnapshotDescription snapshot,
                    HTableDescriptor hTableDescriptor)
                      throws IOException
```
    Called before a snapshot is cloned. Called as part of restoreSnapshot RPC call. It can't bypass the default action, e.g., ctx.bypass() won't have effect.
    
    参数:
    ctx - the environment to interact with the framework and master
    snapshot - the SnapshotDescriptor for the snapshot
    hTableDescriptor - the hTableDescriptor of the table to create
    
    抛出:
    
    IOException
  - postCloneSnapshot
```
void postCloneSnapshot(ObserverContext<MasterCoprocessorEnvironment> ctx,
                     org.apache.hadoop.hbase.protobuf.generated.HBaseProtos.SnapshotDescription snapshot,
                     HTableDescriptor hTableDescriptor)
                       throws IOException
```
    Called after a snapshot clone operation has been requested. Called as part of restoreSnapshot RPC call.
    
    参数:
    ctx - the environment to interact with the framework and master
    snapshot - the SnapshotDescriptor for the snapshot
    hTableDescriptor - the hTableDescriptor of the table to create
    
    抛出:
    
    IOException
  - preRestoreSnapshot
```
void preRestoreSnapshot(ObserverContext<MasterCoprocessorEnvironment> ctx,
                      org.apache.hadoop.hbase.protobuf.generated.HBaseProtos.SnapshotDescription snapshot,
                      HTableDescriptor hTableDescriptor)
                        throws IOException
```
    Called before a snapshot is restored. Called as part of restoreSnapshot RPC call. It can't bypass the default action, e.g., ctx.bypass() won't have effect.
    
    参数:
    ctx - the environment to interact with the framework and master
    snapshot - the SnapshotDescriptor for the snapshot
    hTableDescriptor - the hTableDescriptor of the table to restore
    
    抛出:
    
    IOException
  - postRestoreSnapshot
```
void postRestoreSnapshot(ObserverContext<MasterCoprocessorEnvironment> ctx,
                       org.apache.hadoop.hbase.protobuf.generated.HBaseProtos.SnapshotDescription snapshot,
                       HTableDescriptor hTableDescriptor)
                         throws IOException
```
    Called after a snapshot restore operation has been requested. Called as part of restoreSnapshot RPC call.
    
    参数:
    ctx - the environment to interact with the framework and master
    snapshot - the SnapshotDescriptor for the snapshot
    hTableDescriptor - the hTableDescriptor of the table to restore
    
    抛出:
    
    IOException
  - preDeleteSnapshot
```
void preDeleteSnapshot(ObserverContext<MasterCoprocessorEnvironment> ctx,
                     org.apache.hadoop.hbase.protobuf.generated.HBaseProtos.SnapshotDescription snapshot)
                       throws IOException
```
    Called before a snapshot is deleted. Called as part of deleteSnapshot RPC call. It can't bypass the default action, e.g., ctx.bypass() won't have effect.
    
    参数:
    ctx - the environment to interact with the framework and master
    snapshot - the SnapshotDescriptor of the snapshot to delete
    
    抛出:
    
    IOException
  - postDeleteSnapshot
```
void postDeleteSnapshot(ObserverContext<MasterCoprocessorEnvironment> ctx,
                      org.apache.hadoop.hbase.protobuf.generated.HBaseProtos.SnapshotDescription snapshot)
                        throws IOException
```
    Called after the delete snapshot operation has been requested. Called as part of deleteSnapshot RPC call.
    
    参数:
    ctx - the environment to interact with the framework and master
    snapshot - the SnapshotDescriptor of the snapshot to delete
    
    抛出:
    
    IOException
  - preGetTableDescriptors
```
@Deprecated
void preGetTableDescriptors(ObserverContext<MasterCoprocessorEnvironment> ctx,
                                     List<TableName> tableNamesList,
                                     List<HTableDescriptor> descriptors)
                            throws IOException
```
    已过时。 Use preGetTableDescriptors with regex instead.
    
    Called before a getTableDescriptors request has been processed.
    
    参数:
    ctx - the environment to interact with the framework and master
    tableNamesList - the list of table names, or null if querying for all
    descriptors - an empty list, can be filled with what to return if bypassing
    
    抛出:
    
    IOException
  - postGetTableDescriptors
```
@Deprecated
void postGetTableDescriptors(ObserverContext<MasterCoprocessorEnvironment> ctx,
                                      List<HTableDescriptor> descriptors)
                             throws IOException
```
    已过时。 Use postGetTableDescriptors with regex instead.
    
    Called after a getTableDescriptors request has been processed.
    
    参数:
    ctx - the environment to interact with the framework and master
    descriptors - the list of descriptors about to be returned
    
    抛出:
    
    IOException
  - preGetTableDescriptors
```
void preGetTableDescriptors(ObserverContext<MasterCoprocessorEnvironment> ctx,
                          List<TableName> tableNamesList,
                          List<HTableDescriptor> descriptors,
                          String regex)
                            throws IOException
```
    Called before a getTableDescriptors request has been processed.
    
    参数:
    ctx - the environment to interact with the framework and master
    tableNamesList - the list of table names, or null if querying for all
    descriptors - an empty list, can be filled with what to return if bypassing
    regex - regular expression used for filtering the table names
    
    抛出:
    
    IOException
  - postGetTableDescriptors
```
void postGetTableDescriptors(ObserverContext<MasterCoprocessorEnvironment> ctx,
                           List<TableName> tableNamesList,
                           List<HTableDescriptor> descriptors,
                           String regex)
                             throws IOException
```
    Called after a getTableDescriptors request has been processed.
    
    参数:
    ctx - the environment to interact with the framework and master
    tableNamesList - the list of table names, or null if querying for all
    descriptors - the list of descriptors about to be returned
    regex - regular expression used for filtering the table names
    
    抛出:
    
    IOException
  - preGetTableNames
```
void preGetTableNames(ObserverContext<MasterCoprocessorEnvironment> ctx,
                    List<HTableDescriptor> descriptors,
                    String regex)
                      throws IOException
```
    Called before a getTableNames request has been processed.
    
    参数:
    ctx - the environment to interact with the framework and master
    descriptors - an empty list, can be filled with what to return if bypassing
    regex - regular expression used for filtering the table names
    
    抛出:
    
    IOException
  - postGetTableNames
```
void postGetTableNames(ObserverContext<MasterCoprocessorEnvironment> ctx,
                     List<HTableDescriptor> descriptors,
                     String regex)
                       throws IOException
```
    Called after a getTableNames request has been processed.
    
    参数:
    ctx - the environment to interact with the framework and master
    descriptors - the list of descriptors about to be returned
    regex - regular expression used for filtering the table names
    
    抛出:
    
    IOException
  - preCreateNamespace
```
void preCreateNamespace(ObserverContext<MasterCoprocessorEnvironment> ctx,
                      NamespaceDescriptor ns)
                        throws IOException
```
    Called before a new namespace is created by HMaster. It can't bypass the default action, e.g., ctx.bypass() won't have effect.
    
    参数:
    ctx - the environment to interact with the framework and master
    ns - the NamespaceDescriptor for the table
    
    抛出:
    
    IOException
  - postCreateNamespace
```
void postCreateNamespace(ObserverContext<MasterCoprocessorEnvironment> ctx,
                       NamespaceDescriptor ns)
                         throws IOException
```
    Called after the createNamespace operation has been requested.
    
    参数:
    ctx - the environment to interact with the framework and master
    ns - the NamespaceDescriptor for the table
    
    抛出:
    
    IOException
  - preDeleteNamespace
```
void preDeleteNamespace(ObserverContext<MasterCoprocessorEnvironment> ctx,
                      String namespace)
                        throws IOException
```
    Called before HMaster deletes a namespace It can't bypass the default action, e.g., ctx.bypass() won't have effect.
    
    参数:
    ctx - the environment to interact with the framework and master
    namespace - the name of the namespace
    
    抛出:
    
    IOException
  - postDeleteNamespace
```
void postDeleteNamespace(ObserverContext<MasterCoprocessorEnvironment> ctx,
                       String namespace)
                         throws IOException
```
    Called after the deleteNamespace operation has been requested.
    
    参数:
    ctx - the environment to interact with the framework and master
    namespace - the name of the namespace
    
    抛出:
    
    IOException
  - preModifyNamespace
```
void preModifyNamespace(ObserverContext<MasterCoprocessorEnvironment> ctx,
                      NamespaceDescriptor ns)
                        throws IOException
```
    Called prior to modifying a namespace's properties. It can't bypass the default action, e.g., ctx.bypass() won't have effect.
    
    参数:
    ctx - the environment to interact with the framework and master
    ns - the NamespaceDescriptor
    
    抛出:
    
    IOException
  - postModifyNamespace
```
void postModifyNamespace(ObserverContext<MasterCoprocessorEnvironment> ctx,
                       NamespaceDescriptor ns)
                         throws IOException
```
    Called after the modifyNamespace operation has been requested.
    
    参数:
    ctx - the environment to interact with the framework and master
    ns - the NamespaceDescriptor
    
    抛出:
    
    IOException
  - preGetNamespaceDescriptor
```
void preGetNamespaceDescriptor(ObserverContext<MasterCoprocessorEnvironment> ctx,
                             String namespace)
                               throws IOException
```
    Called before a getNamespaceDescriptor request has been processed.
    
    参数:
    ctx - the environment to interact with the framework and master
    namespace - the name of the namespace
    
    抛出:
    
    IOException
  - postGetNamespaceDescriptor
```
void postGetNamespaceDescriptor(ObserverContext<MasterCoprocessorEnvironment> ctx,
                              NamespaceDescriptor ns)
                                throws IOException
```
    Called after a getNamespaceDescriptor request has been processed.
    
    参数:
    ctx - the environment to interact with the framework and master
    ns - the NamespaceDescriptor
    
    抛出:
    
    IOException
  - preListNamespaceDescriptors
```
void preListNamespaceDescriptors(ObserverContext<MasterCoprocessorEnvironment> ctx,
                               List<NamespaceDescriptor> descriptors)
                                 throws IOException
```
    Called before a listNamespaceDescriptors request has been processed.
    
    参数:
    ctx - the environment to interact with the framework and master
    descriptors - an empty list, can be filled with what to return if bypassing
    
    抛出:
    
    IOException
  - postListNamespaceDescriptors
```
void postListNamespaceDescriptors(ObserverContext<MasterCoprocessorEnvironment> ctx,
                                List<NamespaceDescriptor> descriptors)
                                  throws IOException
```
    Called after a listNamespaceDescriptors request has been processed.
    
    参数:
    ctx - the environment to interact with the framework and master
    descriptors - the list of descriptors about to be returned
    
    抛出:
    
    IOException
  - preTableFlush
```
void preTableFlush(ObserverContext<MasterCoprocessorEnvironment> ctx,
                 TableName tableName)
                   throws IOException
```
    Called before the table memstore is flushed to disk.
    
    参数:
    ctx - the environment to interact with the framework and master
    tableName - the name of the table
    
    抛出:
    
    IOException
  - postTableFlush
```
void postTableFlush(ObserverContext<MasterCoprocessorEnvironment> ctx,
                  TableName tableName)
                    throws IOException
```
    Called after the table memstore is flushed to disk.
    
    参数:
    ctx - the environment to interact with the framework and master
    tableName - the name of the table
    
    抛出:
    
    IOException
  - preSetUserQuota
```
void preSetUserQuota(ObserverContext<MasterCoprocessorEnvironment> ctx,
                   String userName,
                   org.apache.hadoop.hbase.protobuf.generated.QuotaProtos.Quotas quotas)
                     throws IOException
```
    Called before the quota for the user is stored.
    
    参数:
    ctx - the environment to interact with the framework and master
    userName - the name of user
    quotas - the quota settings
    
    抛出:
    
    IOException
  - postSetUserQuota
```
void postSetUserQuota(ObserverContext<MasterCoprocessorEnvironment> ctx,
                    String userName,
                    org.apache.hadoop.hbase.protobuf.generated.QuotaProtos.Quotas quotas)
                      throws IOException
```
    Called after the quota for the user is stored.
    
    参数:
    ctx - the environment to interact with the framework and master
    userName - the name of user
    quotas - the quota settings
    
    抛出:
    
    IOException
  - preSetUserQuota
```
void preSetUserQuota(ObserverContext<MasterCoprocessorEnvironment> ctx,
                   String userName,
                   TableName tableName,
                   org.apache.hadoop.hbase.protobuf.generated.QuotaProtos.Quotas quotas)
                     throws IOException
```
    Called before the quota for the user on the specified table is stored.
    
    参数:
    ctx - the environment to interact with the framework and master
    userName - the name of user
    tableName - the name of the table
    quotas - the quota settings
    
    抛出:
    
    IOException
  - postSetUserQuota
```
void postSetUserQuota(ObserverContext<MasterCoprocessorEnvironment> ctx,
                    String userName,
                    TableName tableName,
                    org.apache.hadoop.hbase.protobuf.generated.QuotaProtos.Quotas quotas)
                      throws IOException
```
    Called after the quota for the user on the specified table is stored.
    
    参数:
    ctx - the environment to interact with the framework and master
    userName - the name of user
    tableName - the name of the table
    quotas - the quota settings
    
    抛出:
    
    IOException
  - preSetUserQuota
```
void preSetUserQuota(ObserverContext<MasterCoprocessorEnvironment> ctx,
                   String userName,
                   String namespace,
                   org.apache.hadoop.hbase.protobuf.generated.QuotaProtos.Quotas quotas)
                     throws IOException
```
    Called before the quota for the user on the specified namespace is stored.
    
    参数:
    ctx - the environment to interact with the framework and master
    userName - the name of user
    namespace - the name of the namespace
    quotas - the quota settings
    
    抛出:
    
    IOException
  - postSetUserQuota
```
void postSetUserQuota(ObserverContext<MasterCoprocessorEnvironment> ctx,
                    String userName,
                    String namespace,
                    org.apache.hadoop.hbase.protobuf.generated.QuotaProtos.Quotas quotas)
                      throws IOException
```
    Called after the quota for the user on the specified namespace is stored.
    
    参数:
    ctx - the environment to interact with the framework and master
    userName - the name of user
    namespace - the name of the namespace
    quotas - the quota settings
    
    抛出:
    
    IOException
  - preSetTableQuota
```
void preSetTableQuota(ObserverContext<MasterCoprocessorEnvironment> ctx,
                    TableName tableName,
                    org.apache.hadoop.hbase.protobuf.generated.QuotaProtos.Quotas quotas)
                      throws IOException
```
    Called before the quota for the table is stored.
    
    参数:
    ctx - the environment to interact with the framework and master
    tableName - the name of the table
    quotas - the quota settings
    
    抛出:
    
    IOException
  - postSetTableQuota
```
void postSetTableQuota(ObserverContext<MasterCoprocessorEnvironment> ctx,
                     TableName tableName,
                     org.apache.hadoop.hbase.protobuf.generated.QuotaProtos.Quotas quotas)
                       throws IOException
```
    Called after the quota for the table is stored.
    
    参数:
    ctx - the environment to interact with the framework and master
    tableName - the name of the table
    quotas - the quota settings
    
    抛出:
    
    IOException
  - preSetNamespaceQuota
```
void preSetNamespaceQuota(ObserverContext<MasterCoprocessorEnvironment> ctx,
                        String namespace,
                        org.apache.hadoop.hbase.protobuf.generated.QuotaProtos.Quotas quotas)
                          throws IOException
```
    Called before the quota for the namespace is stored.
    
    参数:
    ctx - the environment to interact with the framework and master
    namespace - the name of the namespace
    quotas - the quota settings
    
    抛出:
    
    IOException
  - postSetNamespaceQuota
```
void postSetNamespaceQuota(ObserverContext<MasterCoprocessorEnvironment> ctx,
                         String namespace,
                         org.apache.hadoop.hbase.protobuf.generated.QuotaProtos.Quotas quotas)
                           throws IOException
```
    Called after the quota for the namespace is stored.
    
    参数:
    ctx - the environment to interact with the framework and master
    namespace - the name of the namespace
    quotas - the quota settings
    
    抛出:
    
    IOException
  - preDispatchMerge
```
void preDispatchMerge(ObserverContext<MasterCoprocessorEnvironment> ctx,
                    HRegionInfo regionA,
                    HRegionInfo regionB)
                      throws IOException
```
    Called before dispatching region merge request. It can't bypass the default action, e.g., ctx.bypass() won't have effect.
    
    参数:
    ctx - coprocessor environment
    regionA - first region to be merged
    regionB - second region to be merged
    
    抛出:
    
    IOException - if an error occurred on the coprocessor
  - postDispatchMerge
```
void postDispatchMerge(ObserverContext<MasterCoprocessorEnvironment> c,
                     HRegionInfo regionA,
                     HRegionInfo regionB)
                       throws IOException
```
    called after dispatching the region merge request.
    
    参数:
    c - coprocessor environment
    regionA - first region to be merged
    regionB - second region to be merged
    
    抛出:
    
    IOException - if an error occurred on the coprocessor
  - preGetClusterStatus
```
void preGetClusterStatus(ObserverContext<MasterCoprocessorEnvironment> ctx)
                         throws IOException
```
    Called before get cluster status.
    
    抛出:
    
    IOException
  - postGetClusterStatus
```
void postGetClusterStatus(ObserverContext<MasterCoprocessorEnvironment> ctx,
                        ClusterStatus status)
                          throws IOException
```
    Called after get cluster status.
    
    抛出:
    
    IOException
  - preClearDeadServers
```
void preClearDeadServers(ObserverContext<MasterCoprocessorEnvironment> ctx)
                         throws IOException
```
    Called before clear dead region servers.
    
    抛出:
    
    IOException
  - postClearDeadServers
```
void postClearDeadServers(ObserverContext<MasterCoprocessorEnvironment> ctx,
                        List<ServerName> servers,
                        List<ServerName> notClearedServers)
                          throws IOException
```
    Called after clear dead region servers.
    
    抛出:
    
    IOException
  - preMoveServers
```
void preMoveServers(ObserverContext<MasterCoprocessorEnvironment> ctx,
                  Set<Address> servers,
                  String targetGroup)
                    throws IOException
```
    Called before servers are moved to target region server group
    
    参数:
    ctx - the environment to interact with the framework and master
    servers - set of servers to move
    targetGroup - destination group
    
    抛出:
    
    IOException
  - postMoveServers
```
void postMoveServers(ObserverContext<MasterCoprocessorEnvironment> ctx,
                   Set<Address> servers,
                   String targetGroup)
                     throws IOException
```
    Called after servers are moved to target region server group
    
    参数:
    ctx - the environment to interact with the framework and master
    servers - set of servers to move
    targetGroup - name of group
    
    抛出:
    
    IOException - on failure
  - preMoveTables
```
void preMoveTables(ObserverContext<MasterCoprocessorEnvironment> ctx,
                 Set<TableName> tables,
                 String targetGroup)
                   throws IOException
```
    Called before tables are moved to target region server group
    
    参数:
    ctx - the environment to interact with the framework and master
    tables - set of tables to move
    targetGroup - name of group
    
    抛出:
    
    IOException - on failure
  - postMoveTables
```
void postMoveTables(ObserverContext<MasterCoprocessorEnvironment> ctx,
                  Set<TableName> tables,
                  String targetGroup)
                    throws IOException
```
    Called after servers are moved to target region server group
    
    参数:
    ctx - the environment to interact with the framework and master
    tables - set of tables to move
    targetGroup - name of group
    
    抛出:
    
    IOException - on failure
  - preMoveServersAndTables
```
void preMoveServersAndTables(ObserverContext<MasterCoprocessorEnvironment> ctx,
                           Set<Address> servers,
                           Set<TableName> tables,
                           String targetGroup)
                             throws IOException
```
    Called before servers are moved to target region server group
    
    参数:
    ctx - the environment to interact with the framework and master
    servers - set of servers to move
    targetGroup - destination group
    
    抛出:
    
    IOException - on failure
  - postMoveServersAndTables
```
void postMoveServersAndTables(ObserverContext<MasterCoprocessorEnvironment> ctx,
                            Set<Address> servers,
                            Set<TableName> tables,
                            String targetGroup)
                              throws IOException
```
    Called after servers are moved to target region server group
    
    参数:
    ctx - the environment to interact with the framework and master
    servers - set of servers to move
    targetGroup - name of group
    
    抛出:
    
    IOException
  - preAddRSGroup
```
void preAddRSGroup(ObserverContext<MasterCoprocessorEnvironment> ctx,
                 String name)
                   throws IOException
```
    Called before a new region server group is added
    
    参数:
    ctx - the environment to interact with the framework and master
    name - group name
    
    抛出:
    
    IOException - on failure
  - postAddRSGroup
```
void postAddRSGroup(ObserverContext<MasterCoprocessorEnvironment> ctx,
                  String name)
                    throws IOException
```
    Called after a new region server group is added
    
    参数:
    ctx - the environment to interact with the framework and master
    name - group name
    
    抛出:
    
    IOException - on failure
  - preRemoveRSGroup
```
void preRemoveRSGroup(ObserverContext<MasterCoprocessorEnvironment> ctx,
                    String name)
                      throws IOException
```
    Called before a region server group is removed
    
    参数:
    ctx - the environment to interact with the framework and master
    name - group name
    
    抛出:
    
    IOException - on failure
  - postRemoveRSGroup
```
void postRemoveRSGroup(ObserverContext<MasterCoprocessorEnvironment> ctx,
                     String name)
                       throws IOException
```
    Called after a region server group is removed
    
    参数:
    ctx - the environment to interact with the framework and master
    name - group name
    
    抛出:
    
    IOException - on failure
  - preRemoveServers
```
void preRemoveServers(ObserverContext<MasterCoprocessorEnvironment> ctx,
                    Set<Address> servers)
                      throws IOException
```
    Called before servers are removed from rsgroup
    
    参数:
    ctx - the environment to interact with the framework and master
    servers - set of decommissioned servers to remove
    
    抛出:
    
    IOException
  - postRemoveServers
```
void postRemoveServers(ObserverContext<MasterCoprocessorEnvironment> ctx,
                     Set<Address> servers)
                       throws IOException
```
    Called after servers are removed from rsgroup
    
    参数:
    ctx - the environment to interact with the framework and master
    servers - set of servers to remove
    
    抛出:
    
    IOException
  - preBalanceRSGroup
```
void preBalanceRSGroup(ObserverContext<MasterCoprocessorEnvironment> ctx,
                     String groupName)
                       throws IOException
```
    Called before a region server group is removed
    
    参数:
    ctx - the environment to interact with the framework and master
    groupName - group name
    
    抛出:
    
    IOException - on failure
  - postBalanceRSGroup
```
void postBalanceRSGroup(ObserverContext<MasterCoprocessorEnvironment> ctx,
                      String groupName,
                      boolean balancerRan)
                        throws IOException
```
    Called after a region server group is removed
    
    参数:
    ctx - the environment to interact with the framework and master
    groupName - group name
    
    抛出:
    
    IOException - on failure

接口 MasterObserver

嵌套类概要

从接口继承的嵌套类/接口 org.apache.hadoop.hbase.Coprocessor

字段概要

从接口继承的字段 org.apache.hadoop.hbase.Coprocessor

方法概要

从接口继承的方法 org.apache.hadoop.hbase.Coprocessor

方法详细资料

preCreateTable

postCreateTable

preCreateTableHandler

postCreateTableHandler

preDeleteTable

postDeleteTable

preDeleteTableHandler

postDeleteTableHandler

preTruncateTable

postTruncateTable

preTruncateTableHandler

postTruncateTableHandler

preModifyTable

postModifyTable

preModifyTableHandler

postModifyTableHandler

preAddColumn

postAddColumn

preAddColumnHandler

postAddColumnHandler

preModifyColumn

postModifyColumn

preModifyColumnHandler

postModifyColumnHandler

preDeleteColumn

postDeleteColumn

preDeleteColumnHandler

postDeleteColumnHandler

preEnableTable

postEnableTable

preEnableTableHandler

postEnableTableHandler

preDisableTable

postDisableTable

preDisableTableHandler

postDisableTableHandler

preMove

postMove

preAbortProcedure

postAbortProcedure

preListProcedures

postListProcedures

preAssign

postAssign

preUnassign

postUnassign

preRegionOffline

postRegionOffline

preBalance

postBalance

preSetSplitOrMergeEnabled

postSetSplitOrMergeEnabled

preBalanceSwitch

postBalanceSwitch

preShutdown

preStopMaster

postStartMaster

preMasterInitialization

preSnapshot

postSnapshot

preListSnapshot

postListSnapshot

preCloneSnapshot

postCloneSnapshot

preRestoreSnapshot

postRestoreSnapshot

preDeleteSnapshot

postDeleteSnapshot

preGetTableDescriptors

postGetTableDescriptors

preGetTableDescriptors

postGetTableDescriptors