Package org.apache.hadoop.hdfs.server.federation.store

Class StateStoreCacheUpdateService

java.lang.Object

org.apache.hadoop.service.AbstractService

org.apache.hadoop.hdfs.server.federation.router.PeriodicService

org.apache.hadoop.hdfs.server.federation.store.StateStoreCacheUpdateService

All Implemented Interfaces:

Closeable, AutoCloseable, org.apache.hadoop.service.Service

public class StateStoreCacheUpdateService
extends PeriodicService

Service to periodically update the StateStoreService cached information in the Router. This is for performance and removes the State Store from the critical path in common operations.

Nested Class Summary

Nested classes/interfaces inherited from interface org.apache.hadoop.service.Service

org.apache.hadoop.service.Service.STATE

Constructor Summary

Constructors

Constructor	Description
StateStoreCacheUpdateService(StateStoreService stateStore)	Create a new Cache update service.

Method Summary

Modifier and Type	Method	Description
void	periodicInvoke()	Method that the service will run periodically.
protected void	serviceInit(org.apache.hadoop.conf.Configuration conf)

Methods inherited from class org.apache.hadoop.hdfs.server.federation.router.PeriodicService

getErrorCount, getIntervalMs, getLastUpdate, getRunCount, serviceStart, serviceStop, setIntervalMs, startPeriodic, stopPeriodic

Methods inherited from class org.apache.hadoop.service.AbstractService

close, getBlockers, getConfig, getFailureCause, getFailureState, getLifecycleHistory, getName, getServiceState, getStartTime, init, isInState, noteFailure, putBlocker, registerGlobalListener, registerServiceListener, removeBlocker, setConfig, start, stop, toString, unregisterGlobalListener, unregisterServiceListener, waitForServiceToStop

Methods inherited from class java.lang.Object

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

Constructor Details

StateStoreCacheUpdateService

public StateStoreCacheUpdateService(StateStoreService stateStore)

Create a new Cache update service.

Parameters:

stateStore - Implementation of the state store

Method Details

serviceInit

protected void serviceInit(org.apache.hadoop.conf.Configuration conf)
                    throws Exception

Overrides:

serviceInit in class org.apache.hadoop.service.AbstractService

Throws:

Exception

periodicInvoke

public void periodicInvoke()

Description copied from class: PeriodicService

Method that the service will run periodically.

Specified by:

periodicInvoke in class PeriodicService