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

Class MountTableRefresherService

java.lang.Object

org.apache.hadoop.service.AbstractService

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

All Implemented Interfaces:

java.io.Closeable, java.lang.AutoCloseable, org.apache.hadoop.service.Service

public class MountTableRefresherService
extends org.apache.hadoop.service.AbstractService

This service is invoked from MountTableStore when there is change in mount table entries and it updates mount table entry cache on local router as well as on all remote routers. Refresh on local router is done by calling CachedRecordStore.loadCache(boolean)} API directly, no RPC call involved, but on remote routers refresh is done through RouterClient(RPC call). To improve performance, all routers are refreshed in separate thread and all connection are cached. Cached connections are removed from cache and closed when their max live time is elapsed.

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
MountTableRefresherService(Router router)	Create a new service to refresh mount table cache when there is change in mount table entries.

Method Summary

Modifier and Type	Method	Description
protected void	closeRouterClient(RouterClient client)
protected RouterClient	createRouterClient(java.net.InetSocketAddress routerSocket, org.apache.hadoop.conf.Configuration config)
protected MountTableRefresherThread	getLocalRefresher(java.lang.String adminAddress)
void	refresh()	Refresh mount table cache of this router as well as all other routers.
protected void	serviceInit(org.apache.hadoop.conf.Configuration conf)
protected void	serviceStart()
protected void	serviceStop()

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 Detail

MountTableRefresherService

public MountTableRefresherService(Router router)

Create a new service to refresh mount table cache when there is change in mount table entries.

Parameters:

router - whose mount table cache will be refreshed

Method Detail

serviceInit

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

Overrides:

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

Throws:

java.lang.Exception

closeRouterClient

@VisibleForTesting
protected void closeRouterClient(RouterClient client)

createRouterClient

@VisibleForTesting
protected RouterClient createRouterClient(java.net.InetSocketAddress routerSocket,
                                          org.apache.hadoop.conf.Configuration config)
                                   throws java.io.IOException

Throws:

java.io.IOException

serviceStart

protected void serviceStart()
                     throws java.lang.Exception

Overrides:

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

Throws:

java.lang.Exception

serviceStop

protected void serviceStop()
                    throws java.lang.Exception

Overrides:

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

Throws:

java.lang.Exception

refresh

public void refresh()
             throws StateStoreUnavailableException

Refresh mount table cache of this router as well as all other routers.

Throws:

StateStoreUnavailableException - if the state store is not available.

getLocalRefresher

@VisibleForTesting
protected MountTableRefresherThread getLocalRefresher(java.lang.String adminAddress)