org.apache.hadoop.hdfs.server.namenode

类 DatanodeDescriptor

java.lang.Object

org.apache.hadoop.hdfs.protocol.DatanodeID

org.apache.hadoop.hdfs.protocol.DatanodeInfo

org.apache.hadoop.hdfs.server.namenode.DatanodeDescriptor

所有已实现的接口:

Comparable<DatanodeID>, Writable, WritableComparable<DatanodeID>, Node

public class DatanodeDescriptor
extends DatanodeInfo

DatanodeDescriptor tracks stats on a given DataNode, such as available storage capacity, last update time, etc., and maintains a set of blocks stored on the datanode. This data structure is a data structure that is internal to the namenode. It is *not* sent over-the-wire to the Client or the Datnodes. Neither is it stored persistently in the fsImage.

嵌套类概要

嵌套类

限定符和类型	类和说明
static class	DatanodeDescriptor.BlockTargetPair Block and targets pair

从类继承的嵌套类/接口 org.apache.hadoop.hdfs.protocol.DatanodeInfo

DatanodeInfo.AdminStates

字段概要

字段

限定符和类型	字段和说明
protected boolean	isAlive
protected boolean	needKeyUpdate

从类继承的字段 org.apache.hadoop.hdfs.protocol.DatanodeInfo

adminState, capacity, dfsUsed, hostName, lastUpdate, location, remaining, xceiverCount

从类继承的字段 org.apache.hadoop.hdfs.protocol.DatanodeID

EMPTY_ARRAY, infoPort, ipcPort, name, storageID

构造器概要

构造器

构造器和说明
DatanodeDescriptor() Default constructor
DatanodeDescriptor(DatanodeID nodeID) DatanodeDescriptor constructor
DatanodeDescriptor(DatanodeID nodeID, long capacity, long dfsUsed, long remaining, int xceiverCount) DatanodeDescriptor constructor
DatanodeDescriptor(DatanodeID nodeID, String networkLocation) DatanodeDescriptor constructor
DatanodeDescriptor(DatanodeID nodeID, String networkLocation, String hostName) DatanodeDescriptor constructor
DatanodeDescriptor(DatanodeID nodeID, String networkLocation, String hostName, long capacity, long dfsUsed, long remaining, int xceiverCount) DatanodeDescriptor constructor

方法概要

方法

限定符和类型	方法和说明
long	getBalancerBandwidth()
int	getBlocksScheduled()
int	numBlocks()
void	setBalancerBandwidth(long bandwidth)

从类继承的方法 org.apache.hadoop.hdfs.protocol.DatanodeInfo

dumpDatanode, getAdminState, getCapacity, getDatanodeReport, getDfsUsed, getDfsUsedPercent, getHostName, getLastUpdate, getLevel, getName, getNameWithIpcPort, getNetworkLocation, getNonDfsUsed, getParent, getRemaining, getRemainingPercent, getXceiverCount, isDecommissioned, isDecommissionInProgress, isStale, readFields, setAdminState, setCapacity, setDecommissioned, setHostName, setLastUpdate, setLevel, setNetworkLocation, setParent, setRemaining, setXceiverCount, startDecommission, stopDecommission, write

从类继承的方法 org.apache.hadoop.hdfs.protocol.DatanodeID

compareTo, equals, getHost, getInfoPort, getIpcPort, getName, getPort, getStorageID, hashCode, setStorageID, toString, updateRegInfo

从类继承的方法 java.lang.Object

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

从接口继承的方法 org.apache.hadoop.net.Node

getName

字段详细资料

isAlive

protected boolean isAlive

needKeyUpdate

protected boolean needKeyUpdate

构造器详细资料

DatanodeDescriptor

public DatanodeDescriptor()

Default constructor

DatanodeDescriptor

public DatanodeDescriptor(DatanodeID nodeID)

DatanodeDescriptor constructor

参数:

nodeID - id of the data node

DatanodeDescriptor

public DatanodeDescriptor(DatanodeID nodeID,
                  String networkLocation)

DatanodeDescriptor constructor

参数:

nodeID - id of the data node

networkLocation - location of the data node in network

DatanodeDescriptor

public DatanodeDescriptor(DatanodeID nodeID,
                  String networkLocation,
                  String hostName)

DatanodeDescriptor constructor

参数:

nodeID - id of the data node

networkLocation - location of the data node in network

hostName - it could be different from host specified for DatanodeID

DatanodeDescriptor

public DatanodeDescriptor(DatanodeID nodeID,
                  long capacity,
                  long dfsUsed,
                  long remaining,
                  int xceiverCount)

DatanodeDescriptor constructor

参数:

nodeID - id of the data node

capacity - capacity of the data node

dfsUsed - space used by the data node

remaining - remaing capacity of the data node

xceiverCount - # of data transfers at the data node

DatanodeDescriptor

public DatanodeDescriptor(DatanodeID nodeID,
                  String networkLocation,
                  String hostName,
                  long capacity,
                  long dfsUsed,
                  long remaining,
                  int xceiverCount)

DatanodeDescriptor constructor

参数:

nodeID - id of the data node

networkLocation - location of the data node in network

capacity - capacity of the data node, including space used by non-dfs

dfsUsed - the used space by dfs datanode

remaining - remaing capacity of the data node

xceiverCount - # of data transfers at the data node

方法详细资料

numBlocks

public int numBlocks()

getBlocksScheduled

public int getBlocksScheduled()

返回:

Approximate number of blocks currently scheduled to be written to this datanode.

getBalancerBandwidth

public long getBalancerBandwidth()

返回:

Blanacer bandwidth in bytes per second for this datanode.

setBalancerBandwidth

public void setBalancerBandwidth(long bandwidth)

参数:

bandwidth - Blanacer bandwidth in bytes per second for this datanode.