org.apache.hadoop.hdfs.server.protocol
Class DatanodeCommand
java.lang.Object
org.apache.hadoop.hdfs.server.protocol.ServerCommand
org.apache.hadoop.hdfs.server.protocol.DatanodeCommand
- All Implemented Interfaces:
- org.apache.hadoop.io.Writable
- Direct Known Subclasses:
- BlockCommand, BlockRecoveryCommand, KeyUpdateCommand, UpgradeCommand
@Union(value={java.lang.Void.class,org.apache.hadoop.hdfs.server.protocol.DatanodeCommand.Register.class,org.apache.hadoop.hdfs.server.protocol.DatanodeCommand.Finalize.class,BlockCommand.class,UpgradeCommand.class,BlockRecoveryCommand.class,KeyUpdateCommand.class})
@InterfaceAudience.Private
@InterfaceStability.Evolving
public abstract class DatanodeCommand
- extends ServerCommand
Base class for data-node command.
Issued by the name-node to notify data-nodes what should be done.
Methods inherited from class java.lang.Object |
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
REGISTER
public static final DatanodeCommand REGISTER
FINALIZE
public static final DatanodeCommand FINALIZE
DatanodeCommand
public DatanodeCommand()
Copyright © 2009 The Apache Software Foundation