org.apache.hadoop.hbase.master.snapshot

Class DisabledTableSnapshotHandler

java.lang.Object

org.apache.hadoop.hbase.executor.EventHandler

org.apache.hadoop.hbase.master.snapshot.TakeSnapshotHandler

org.apache.hadoop.hbase.master.snapshot.DisabledTableSnapshotHandler

All Implemented Interfaces:

Comparable<EventHandler>, Runnable, ForeignExceptionSnare, SnapshotSentinel

@InterfaceAudience.Private
 @InterfaceStability.Evolving
public class DisabledTableSnapshotHandler
extends TakeSnapshotHandler

Take a snapshot of a disabled table.

Table must exist when taking the snapshot, or results are undefined.

Field Summary

Fields inherited from class org.apache.hadoop.hbase.master.snapshot.TakeSnapshotHandler

conf, htd, master, metricsSnapshot, monitor, rootDir, rootFs, snapshot, snapshotManager, snapshotManifest, snapshotTable, status, workingDir, workingDirFs

Fields inherited from class org.apache.hadoop.hbase.executor.EventHandler

eventType, seqids, server, waitingTimeForEvents

Constructor Summary

Constructors

Constructor and Description
DisabledTableSnapshotHandler(org.apache.hadoop.hbase.shaded.protobuf.generated.SnapshotProtos.SnapshotDescription snapshot, MasterServices masterServices, SnapshotManager snapshotManager)

Method Summary

Modifier and Type	Method and Description
protected boolean	downgradeToSharedTableLock() When taking snapshot, first we must acquire the exclusive table lock to confirm that there are no ongoing merge/split procedures.
DisabledTableSnapshotHandler	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	snapshotRegions(List<Pair<RegionInfo,ServerName>> regionsAndLocations) Snapshot the specified regions

Methods inherited from class org.apache.hadoop.hbase.master.snapshot.TakeSnapshotHandler

cancel, getCompletionTimestamp, getException, getExceptionIfFailed, getSnapshot, hasException, isFinished, process, rethrowException, rethrowExceptionIfFailed, snapshotDisabledRegion

Methods inherited from class org.apache.hadoop.hbase.executor.EventHandler

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

Methods inherited from class java.lang.Object

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

Constructor Detail

DisabledTableSnapshotHandler

public DisabledTableSnapshotHandler(org.apache.hadoop.hbase.shaded.protobuf.generated.SnapshotProtos.SnapshotDescription snapshot,
                                    MasterServices masterServices,
                                    SnapshotManager snapshotManager)
                             throws IOException

Parameters:

snapshot - descriptor of the snapshot to take

masterServices - master services provider

Throws:

IOException - if it cannot access the filesystem of the snapshot temporary directory

Method Detail

prepare

public DisabledTableSnapshotHandler prepare()
                                     throws Exception

Description copied from class: 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().

Overrides:

prepare in class TakeSnapshotHandler

Returns:

the instance of this class

Throws:

Exception - when something goes wrong

snapshotRegions

public void snapshotRegions(List<Pair<RegionInfo,ServerName>> regionsAndLocations)
                     throws IOException,
                            org.apache.zookeeper.KeeperException

Description copied from class: TakeSnapshotHandler

Snapshot the specified regions

Specified by:

snapshotRegions in class TakeSnapshotHandler

Throws:

IOException

org.apache.zookeeper.KeeperException

downgradeToSharedTableLock

protected boolean downgradeToSharedTableLock()

Description copied from class: TakeSnapshotHandler

When taking snapshot, first we must acquire the exclusive table lock to confirm that there are no ongoing merge/split procedures. But later, we should try our best to release the exclusive lock as this may hurt the availability, because we need to hold the shared lock when assigning regions.

See HBASE-21480 for more details.

Specified by:

downgradeToSharedTableLock in class TakeSnapshotHandler