org.apache.hadoop.hdfs.server.namenode

类 UpgradeObjectNamenode

java.lang.Object

org.apache.hadoop.hdfs.server.common.UpgradeObject

org.apache.hadoop.hdfs.server.namenode.UpgradeObjectNamenode

所有已实现的接口:

Comparable<Upgradeable>, Upgradeable

public abstract class UpgradeObjectNamenode
extends UpgradeObject

Base class for name-node upgrade objects. Data-node upgrades are run in separate threads.

字段概要

从类继承的字段 org.apache.hadoop.hdfs.server.common.UpgradeObject

status

构造器概要

构造器

构造器和说明
UpgradeObjectNamenode()

方法概要

方法

限定符和类型	方法和说明
void	forceProceed()
protected FSNamesystem	getFSNamesystem()
HdfsConstants.NodeType	getType() Get the type of the software component, which this object is upgrading.
abstract UpgradeCommand	processUpgradeCommand(UpgradeCommand command) Process an upgrade command.
UpgradeCommand	startUpgrade() Prepare for the upgrade.

从类继承的方法 org.apache.hadoop.hdfs.server.common.UpgradeObject

compareTo, equals, getDescription, getUpgradeStatus, getUpgradeStatusReport, hashCode

从类继承的方法 java.lang.Object

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

从接口继承的方法 org.apache.hadoop.hdfs.server.common.Upgradeable

completeUpgrade, getVersion

构造器详细资料

UpgradeObjectNamenode

public UpgradeObjectNamenode()

方法详细资料

processUpgradeCommand

public abstract UpgradeCommand processUpgradeCommand(UpgradeCommand command)
                                              throws IOException

Process an upgrade command. RPC has only one very generic command for all upgrade related inter component communications. The actual command recognition and execution should be handled here. The reply is sent back also as an UpgradeCommand.

参数:

command -

返回:

the reply command which is analyzed on the client side.

抛出:

IOException

getType

public HdfsConstants.NodeType getType()

从接口复制的说明: Upgradeable

Get the type of the software component, which this object is upgrading.

返回:

type

startUpgrade

public UpgradeCommand startUpgrade()
                            throws IOException

从接口复制的说明: Upgradeable

Prepare for the upgrade. E.g. initialize upgrade data structures and set status to 0. Returns an upgrade command that is used for broadcasting to other cluster components. E.g. name-node informs data-nodes that they must perform a distributed upgrade.

返回:

an UpgradeCommand for broadcasting.

抛出:

IOException

getFSNamesystem

protected FSNamesystem getFSNamesystem()

forceProceed

public void forceProceed()
                  throws IOException

抛出:

IOException