org.apache.hadoop.hbase.regionserver.snapshot

类 RegionServerSnapshotManager

java.lang.Object

org.apache.hadoop.hbase.procedure.ProcedureManager

org.apache.hadoop.hbase.procedure.RegionServerProcedureManager

org.apache.hadoop.hbase.regionserver.snapshot.RegionServerSnapshotManager

@InterfaceAudience.LimitedPrivate(value="Configuration")
 @InterfaceStability.Unstable
public class RegionServerSnapshotManager
extends RegionServerProcedureManager

This manager class handles the work dealing with snapshots for a HRegionServer.

This provides the mechanism necessary to kick off a online snapshot specific Subprocedure that is responsible for the regions being served by this region server. If any failures occur with the subprocedure, the RegionSeverSnapshotManager's subprocedure handler, ProcedureMember, notifies the master's ProcedureCoordinator to abort all others.

On startup, requires start() to be called.

On shutdown, requires stop(boolean) to be called

嵌套类概要

嵌套类

限定符和类型	类和说明
class	RegionServerSnapshotManager.SnapshotSubprocedureBuilder Build the actual snapshot runner that will do all the 'hard' work

字段概要

字段

限定符和类型	字段和说明
static int	SNAPSHOT_REQUEST_THREADS_DEFAULT # of threads for snapshotting regions on the rs.
static String	SNAPSHOT_REQUEST_THREADS_KEY Conf key for number of request threads to start snapshots on regionservers
static String	SNAPSHOT_REQUEST_WAKE_MILLIS_KEY Conf key for millis between checks to see if snapshot completed or if there are errors
static long	SNAPSHOT_TIMEOUT_MILLIS_DEFAULT Keep threads alive in request pool for max of 300 seconds
static String	SNAPSHOT_TIMEOUT_MILLIS_KEY Conf key for max time to keep threads in snapshot request pool waiting

构造器概要

构造器

构造器和说明
RegionServerSnapshotManager()

方法概要

限定符和类型	方法和说明
Subprocedure	buildSubprocedure(org.apache.hadoop.hbase.shaded.protobuf.generated.SnapshotProtos.SnapshotDescription snapshot) If in a running state, creates the specified subprocedure for handling an online snapshot.
String	getProcedureSignature() Return the unique signature of the procedure.
void	initialize(RegionServerServices rss) Create a default snapshot handler - uses a zookeeper based member controller.
void	start() Start accepting snapshot requests.
void	stop(boolean force) Close this and all running snapshot tasks

从类继承的方法 org.apache.hadoop.hbase.procedure.ProcedureManager

equals, hashCode

从类继承的方法 java.lang.Object

clone, finalize, getClass, notify, notifyAll, toString, wait, wait, wait

字段详细资料

SNAPSHOT_REQUEST_THREADS_KEY

public static final String SNAPSHOT_REQUEST_THREADS_KEY

Conf key for number of request threads to start snapshots on regionservers

另请参阅:

常量字段值

SNAPSHOT_REQUEST_THREADS_DEFAULT

public static final int SNAPSHOT_REQUEST_THREADS_DEFAULT

# of threads for snapshotting regions on the rs.

另请参阅:

常量字段值

SNAPSHOT_TIMEOUT_MILLIS_KEY

public static final String SNAPSHOT_TIMEOUT_MILLIS_KEY

Conf key for max time to keep threads in snapshot request pool waiting

另请参阅:

常量字段值

SNAPSHOT_TIMEOUT_MILLIS_DEFAULT

public static final long SNAPSHOT_TIMEOUT_MILLIS_DEFAULT

Keep threads alive in request pool for max of 300 seconds

另请参阅:

常量字段值

SNAPSHOT_REQUEST_WAKE_MILLIS_KEY

public static final String SNAPSHOT_REQUEST_WAKE_MILLIS_KEY

Conf key for millis between checks to see if snapshot completed or if there are errors

另请参阅:

常量字段值

构造器详细资料

RegionServerSnapshotManager

public RegionServerSnapshotManager()

方法详细资料

start

public void start()

Start accepting snapshot requests.

指定者:

start 在类中 RegionServerProcedureManager

stop

public void stop(boolean force)
          throws IOException

Close this and all running snapshot tasks

指定者:

stop 在类中 RegionServerProcedureManager

参数:

force - forcefully stop all running tasks

抛出:

IOException

buildSubprocedure

public Subprocedure buildSubprocedure(org.apache.hadoop.hbase.shaded.protobuf.generated.SnapshotProtos.SnapshotDescription snapshot)

If in a running state, creates the specified subprocedure for handling an online snapshot. Because this gets the local list of regions to snapshot and not the set the master had, there is a possibility of a race where regions may be missed. This detected by the master in the snapshot verification step.

参数:

snapshot -

返回:

Subprocedure to submit to the ProcedureMemeber.

initialize

public void initialize(RegionServerServices rss)
                throws org.apache.zookeeper.KeeperException

Create a default snapshot handler - uses a zookeeper based member controller.

指定者:

initialize 在类中 RegionServerProcedureManager

参数:

rss - region server running the handler

抛出:

org.apache.zookeeper.KeeperException - if the zookeeper cluster cannot be reached

getProcedureSignature

public String getProcedureSignature()

从类复制的说明: ProcedureManager

Return the unique signature of the procedure. This signature uniquely identifies the procedure. By default, this signature is the string used in the procedure controller (i.e., the root ZK node name for the procedure)

指定者:

getProcedureSignature 在类中 ProcedureManager