org.apache.hadoop.hbase.regionserver.handler

Class RegionReplicaFlushHandler

java.lang.Object

org.apache.hadoop.hbase.executor.EventHandler

org.apache.hadoop.hbase.regionserver.handler.RegionReplicaFlushHandler

All Implemented Interfaces:

Comparable<Runnable>, Runnable

@InterfaceAudience.Private
public class RegionReplicaFlushHandler
extends EventHandler

HBASE-11580: With the async wal approach (HBASE-11568), the edits are not persisted to wal in secondary region replicas. This means that a secondary region replica can serve some edits from it's memstore that that is still not flushed from primary. We do not want to allow secondary region's seqId to go back in time, when this secondary region is opened elsewhere after a crash or region move. We will trigger a flush cache in the primary region replica and wait for observing a complete flush cycle before marking the region readsEnabled. This handler does the flushing of the primary region replica and ensures that regular region opening is not blocked while the secondary replica is blocked on flush.

Field Summary

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

eventType, seqids, server, waitingTimeForEvents

Constructor Summary

Constructors

Constructor and Description
RegionReplicaFlushHandler(Server server, org.apache.hadoop.hbase.client.ClusterConnection connection, org.apache.hadoop.hbase.client.RpcRetryingCallerFactory rpcRetryingCallerFactory, org.apache.hadoop.hbase.ipc.RpcControllerFactory rpcControllerFactory, int operationTimeout, HRegion region)

Method Summary

Modifier and Type	Method and Description
protected void	handleException(Throwable t) Event exception handler, may be overridden
void	process() This method is the main processing loop to be implemented by the various subclasses.

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

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

Methods inherited from class java.lang.Object

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

Constructor Detail

RegionReplicaFlushHandler

public RegionReplicaFlushHandler(Server server,
                                 org.apache.hadoop.hbase.client.ClusterConnection connection,
                                 org.apache.hadoop.hbase.client.RpcRetryingCallerFactory rpcRetryingCallerFactory,
                                 org.apache.hadoop.hbase.ipc.RpcControllerFactory rpcControllerFactory,
                                 int operationTimeout,
                                 HRegion region)

Method Detail

process

public void process()
             throws IOException

Description copied from class: EventHandler

This method is the main processing loop to be implemented by the various subclasses.

Specified by:

process in class EventHandler

Throws:

IOException

handleException

protected void handleException(Throwable t)

Description copied from class: EventHandler

Event exception handler, may be overridden

Overrides:

handleException in class EventHandler

Parameters:

t - Throwable object