org.apache.hadoop.hbase.master.snapshot

类 RestoreSnapshotHandler

java.lang.Object

org.apache.hadoop.hbase.executor.EventHandler

org.apache.hadoop.hbase.master.handler.TableEventHandler

org.apache.hadoop.hbase.master.snapshot.RestoreSnapshotHandler

所有已实现的接口:

Comparable<Runnable>, Runnable, SnapshotSentinel

@InterfaceAudience.Private
public class RestoreSnapshotHandler
extends TableEventHandler
implements SnapshotSentinel

Handler to Restore a snapshot.

Uses RestoreSnapshotHelper to replace the table content with the data available in the snapshot.

嵌套类概要

从类继承的嵌套类/接口 org.apache.hadoop.hbase.executor.EventHandler

EventHandler.EventHandlerListener

字段概要

从类继承的字段 org.apache.hadoop.hbase.master.handler.TableEventHandler

masterServices, tableLock, tableName

从类继承的字段 org.apache.hadoop.hbase.executor.EventHandler

eventType, seqids, server, waitingTimeForEvents

构造器概要

构造器

构造器和说明
RestoreSnapshotHandler(MasterServices masterServices, org.apache.hadoop.hbase.protobuf.generated.HBaseProtos.SnapshotDescription snapshot, HTableDescriptor htd, boolean restoreAcl)

方法概要

方法

限定符和类型	方法和说明
void	cancel(String why) Actively cancel a running snapshot.
protected void	completed(Throwable exception) Called after that process() is completed.
long	getCompletionTimestamp()
ForeignException	getExceptionIfFailed() Get the exception that caused the snapshot to fail, if the snapshot has failed.
org.apache.hadoop.hbase.protobuf.generated.HBaseProtos.SnapshotDescription	getSnapshot()
protected void	handleTableOperation(List<HRegionInfo> hris) The restore table is executed in place
boolean	isFinished() Check to see if the snapshot is finished, where finished may be success or failure.
RestoreSnapshotHandler	prepare() Event handlers should do all the necessary checks in this method (rather than in the constructor, or in process()) so that the caller, which is mostly executed in the ipc context can fail fast.
void	rethrowExceptionIfFailed() Rethrow the exception returned by SnapshotSentinel.getExceptionIfFailed().

从类继承的方法 org.apache.hadoop.hbase.master.handler.TableEventHandler

getTableDescriptor, prepareWithTableLock, process, releaseTableLock, reOpenAllRegions

从类继承的方法 org.apache.hadoop.hbase.executor.EventHandler

compareTo, getEventType, getInformativeName, getListener, getPriority, getSeqid, handleException, run, setListener, toString

从类继承的方法 java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

构造器详细资料

RestoreSnapshotHandler

public RestoreSnapshotHandler(MasterServices masterServices,
                      org.apache.hadoop.hbase.protobuf.generated.HBaseProtos.SnapshotDescription snapshot,
                      HTableDescriptor htd,
                      boolean restoreAcl)
                       throws IOException

抛出:

IOException

方法详细资料

prepare

public RestoreSnapshotHandler prepare()
                               throws IOException

从类复制的说明: EventHandler

Event handlers should do all the necessary checks in this method (rather than in the constructor, or in process()) so that the caller, which is mostly executed in the ipc context can fail fast. Process is executed async from the client ipc, so this method gives a quick chance to do some basic checks. Should be called after constructing the EventHandler, and before process().

覆盖:

prepare 在类中 TableEventHandler

返回:

the instance of this class

抛出:

IOException

handleTableOperation

protected void handleTableOperation(List<HRegionInfo> hris)
                             throws IOException

The restore table is executed in place. - The on-disk data will be restored - reference files are put in place without moving data - [if something fail here: you need to delete the table and re-run the restore] - hbase:meta will be updated - [if something fail here: you need to run hbck to fix hbase:meta entries] The passed in list gets changed in this method

指定者:

handleTableOperation 在类中 TableEventHandler

抛出:

IOException

completed

protected void completed(Throwable exception)

从类复制的说明: TableEventHandler

Called after that process() is completed.

覆盖:

completed 在类中 TableEventHandler

参数:

exception - null if process() is successful or not null if something has failed.

isFinished

public boolean isFinished()

从接口复制的说明: SnapshotSentinel

Check to see if the snapshot is finished, where finished may be success or failure.

指定者:

isFinished 在接口中 SnapshotSentinel

返回:

false if the snapshot is still in progress, true if the snapshot has finished

getCompletionTimestamp

public long getCompletionTimestamp()

指定者:

getCompletionTimestamp 在接口中 SnapshotSentinel

返回:

-1 if the snapshot is in progress, otherwise the completion timestamp.

getSnapshot

public org.apache.hadoop.hbase.protobuf.generated.HBaseProtos.SnapshotDescription getSnapshot()

指定者:

getSnapshot 在接口中 SnapshotSentinel

返回:

the description of the snapshot being run

cancel

public void cancel(String why)

从接口复制的说明: SnapshotSentinel

Actively cancel a running snapshot.

指定者:

cancel 在接口中 SnapshotSentinel

参数:

why - Reason for cancellation.

getExceptionIfFailed

public ForeignException getExceptionIfFailed()

从接口复制的说明: SnapshotSentinel

Get the exception that caused the snapshot to fail, if the snapshot has failed.

指定者:

getExceptionIfFailed 在接口中 SnapshotSentinel

返回:

ForeignException that caused the snapshot to fail, or null if the snapshot is still in progress or has succeeded

rethrowExceptionIfFailed

public void rethrowExceptionIfFailed()
                              throws ForeignException

从接口复制的说明: SnapshotSentinel

Rethrow the exception returned by SnapshotSentinel.getExceptionIfFailed(). If there is no exception this is a no-op.

指定者:

rethrowExceptionIfFailed 在接口中 SnapshotSentinel

抛出:

ForeignException - all exceptions from remote sources are procedure exceptions