org.apache.hadoop.hdfs.server.blockmanagement

Class DatanodeAdminMonitorBase

java.lang.Object

org.apache.hadoop.hdfs.server.blockmanagement.DatanodeAdminMonitorBase

All Implemented Interfaces:

Runnable, org.apache.hadoop.conf.Configurable, DatanodeAdminMonitorInterface

Direct Known Subclasses:

DatanodeAdminBackoffMonitor, DatanodeAdminDefaultMonitor

public abstract class DatanodeAdminMonitorBase
extends Object
implements DatanodeAdminMonitorInterface, org.apache.hadoop.conf.Configurable

This abstract class provides some base methods which are inherited by the DatanodeAdmin BackOff and Default Monitors, which control decommission and maintenance mode.

Field Summary

Fields

Modifier and Type	Field and Description
protected org.apache.hadoop.hdfs.server.blockmanagement.BlockManager	blockManager
protected org.apache.hadoop.conf.Configuration	conf
protected org.apache.hadoop.hdfs.server.blockmanagement.DatanodeAdminManager	dnAdmin
protected int	maxConcurrentTrackedNodes The maximum number of nodes to track in outOfServiceNodeBlocks.
protected org.apache.hadoop.hdfs.server.namenode.Namesystem	namesystem

Constructor Summary

Constructors

Constructor and Description
DatanodeAdminMonitorBase()

Method Summary

Modifier and Type	Method and Description
Queue<org.apache.hadoop.hdfs.server.blockmanagement.DatanodeDescriptor>	getCancelledNodes()
org.apache.hadoop.conf.Configuration	getConf() Get the current Configuration stored in this object.
int	getPendingNodeCount() Get the number of datanodes nodes in the pending queue.
Queue<org.apache.hadoop.hdfs.server.blockmanagement.DatanodeDescriptor>	getPendingNodes()
protected abstract void	processConf() Abstract method which must be implemented by the sub-classes to process set various instance variables from the Configuration passed at object creation time.
void	setBlockManager(org.apache.hadoop.hdfs.server.blockmanagement.BlockManager bm) Set the blockmanager for the cluster.
void	setConf(org.apache.hadoop.conf.Configuration conf) Used by the Configurable interface, which is used by ReflectionUtils to create an instance of the monitor class.
void	setDatanodeAdminManager(org.apache.hadoop.hdfs.server.blockmanagement.DatanodeAdminManager admin) Set the DatanodeAdminManager instance in use in the namenode.
void	setNameSystem(org.apache.hadoop.hdfs.server.namenode.Namesystem ns) Set the cluster namesystem.
void	startTrackingNode(org.apache.hadoop.hdfs.server.blockmanagement.DatanodeDescriptor dn) Start tracking a node for decommission or maintenance.

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.apache.hadoop.hdfs.server.blockmanagement.DatanodeAdminMonitorInterface

getBlocksPerLock, getNumNodesChecked, getPendingRepLimit, getTrackedNodeCount, setBlocksPerLock, setPendingRepLimit, stopTrackingNode

Methods inherited from interface java.lang.Runnable

run

Field Detail

blockManager

protected org.apache.hadoop.hdfs.server.blockmanagement.BlockManager blockManager

namesystem

protected org.apache.hadoop.hdfs.server.namenode.Namesystem namesystem

dnAdmin

protected org.apache.hadoop.hdfs.server.blockmanagement.DatanodeAdminManager dnAdmin

conf

protected org.apache.hadoop.conf.Configuration conf

maxConcurrentTrackedNodes

protected int maxConcurrentTrackedNodes

The maximum number of nodes to track in outOfServiceNodeBlocks. A value of 0 means no limit.

Constructor Detail

DatanodeAdminMonitorBase

public DatanodeAdminMonitorBase()

Method Detail

setNameSystem

public void setNameSystem(org.apache.hadoop.hdfs.server.namenode.Namesystem ns)

Set the cluster namesystem.

Specified by:

setNameSystem in interface DatanodeAdminMonitorInterface

Parameters:

ns - The namesystem for the cluster

setBlockManager

public void setBlockManager(org.apache.hadoop.hdfs.server.blockmanagement.BlockManager bm)

Set the blockmanager for the cluster.

Specified by:

setBlockManager in interface DatanodeAdminMonitorInterface

Parameters:

bm - The cluster BlockManager

setDatanodeAdminManager

public void setDatanodeAdminManager(org.apache.hadoop.hdfs.server.blockmanagement.DatanodeAdminManager admin)

Set the DatanodeAdminManager instance in use in the namenode.

Specified by:

setDatanodeAdminManager in interface DatanodeAdminMonitorInterface

Parameters:

admin - The current DatanodeAdminManager

setConf

public void setConf(org.apache.hadoop.conf.Configuration conf)

Used by the Configurable interface, which is used by ReflectionUtils to create an instance of the monitor class. This method will be called to pass the Configuration to the new object.

Specified by:

setConf in interface org.apache.hadoop.conf.Configurable

Parameters:

conf - configuration to be used

getConf

public org.apache.hadoop.conf.Configuration getConf()

Get the current Configuration stored in this object.

Specified by:

getConf in interface org.apache.hadoop.conf.Configurable

Returns:

Configuration used when the object was created

processConf

protected abstract void processConf()

Abstract method which must be implemented by the sub-classes to process set various instance variables from the Configuration passed at object creation time.

startTrackingNode

public void startTrackingNode(org.apache.hadoop.hdfs.server.blockmanagement.DatanodeDescriptor dn)

Start tracking a node for decommission or maintenance. The given Datanode will be queued for later processing in pendingNodes. This method must be called under the namenode write lock.

Specified by:

startTrackingNode in interface DatanodeAdminMonitorInterface

Parameters:

dn - The datanode to start tracking

getPendingNodeCount

public int getPendingNodeCount()

Get the number of datanodes nodes in the pending queue. Ie the count of nodes waiting to decommission but have not yet started the process.

Specified by:

getPendingNodeCount in interface DatanodeAdminMonitorInterface

Returns:

The count of pending nodes

getPendingNodes

public Queue<org.apache.hadoop.hdfs.server.blockmanagement.DatanodeDescriptor> getPendingNodes()

Specified by:

getPendingNodes in interface DatanodeAdminMonitorInterface

getCancelledNodes

public Queue<org.apache.hadoop.hdfs.server.blockmanagement.DatanodeDescriptor> getCancelledNodes()

Specified by:

getCancelledNodes in interface DatanodeAdminMonitorInterface