org.apache.hadoop.hbase.client

Class MasterAddressRefresher

java.lang.Object

org.apache.hadoop.hbase.client.MasterAddressRefresher

All Implemented Interfaces:

Closeable, AutoCloseable

@InterfaceAudience.Private
public class MasterAddressRefresher
extends Object
implements Closeable

Thread safe utility that keeps master end points used by MasterRegistry up to date. This uses the RPC MasterProtos.ClientMetaService.getMasters(org.apache.hbase.thirdparty.com.google.protobuf.RpcController, org.apache.hadoop.hbase.shaded.protobuf.generated.MasterProtos.GetMastersRequest, org.apache.hbase.thirdparty.com.google.protobuf.RpcCallback<org.apache.hadoop.hbase.shaded.protobuf.generated.MasterProtos.GetMastersResponse>) to fetch the latest list of registered masters. By default the refresh happens periodically (configured via PERIODIC_REFRESH_INTERVAL_SECS). The refresh can also be triggered on demand via refreshNow(). To prevent a flood of on-demand refreshes we expect that any attempts two should be spaced at least MIN_SECS_BETWEEN_REFRESHES seconds apart.

Field Summary

Fields

Modifier and Type	Field and Description
static String	MIN_SECS_BETWEEN_REFRESHES
static String	PERIODIC_REFRESH_INTERVAL_SECS

Method Summary

Modifier and Type	Method and Description
void	close()

Methods inherited from class java.lang.Object

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

Field Detail

PERIODIC_REFRESH_INTERVAL_SECS

public static final String PERIODIC_REFRESH_INTERVAL_SECS

See Also:

Constant Field Values

MIN_SECS_BETWEEN_REFRESHES

public static final String MIN_SECS_BETWEEN_REFRESHES

See Also:

Constant Field Values

Method Detail

close

public void close()

Specified by:

close in interface Closeable

Specified by:

close in interface AutoCloseable