org.apache.hadoop.hdfs.net

Class DFSTopologyNodeImpl

java.lang.Object

org.apache.hadoop.net.NodeBase

org.apache.hadoop.net.InnerNodeImpl

org.apache.hadoop.hdfs.net.DFSTopologyNodeImpl

All Implemented Interfaces:

org.apache.hadoop.net.InnerNode, org.apache.hadoop.net.Node

public class DFSTopologyNodeImpl
extends org.apache.hadoop.net.InnerNodeImpl

The HDFS-specific representation of a network topology inner node. The difference is this class includes the information about the storage type info of this subtree. This info will be used when selecting subtrees in block placement.

Field Summary

Fields

Modifier and Type	Field and Description
static org.slf4j.Logger	LOG

Fields inherited from class org.apache.hadoop.net.InnerNodeImpl

children, childrenMap, numOfLeaves

Fields inherited from class org.apache.hadoop.net.NodeBase

level, location, name, parent, PATH_SEPARATOR, PATH_SEPARATOR_STR, ROOT

Method Summary

Methods

Modifier and Type	Method and Description
boolean	add(org.apache.hadoop.net.Node n)
void	childAddStorage(String childName, org.apache.hadoop.fs.StorageType type) Called by a child node of the current node to increment a storage count.
void	childRemoveStorage(String childName, org.apache.hadoop.fs.StorageType type) Called by a child node of the current node to decrement a storage count.
boolean	equals(Object o)
int	getSubtreeStorageCount(org.apache.hadoop.fs.StorageType type)
int	hashCode()
boolean	remove(org.apache.hadoop.net.Node n)

Methods inherited from class org.apache.hadoop.net.InnerNodeImpl

getChildren, getLeaf, getLoc, getNextAncestorName, getNumOfLeaves, isAncestor, isParent, isRack

Methods inherited from class org.apache.hadoop.net.NodeBase

getLevel, getName, getNetworkLocation, getParent, getPath, getPathComponents, locationToDepth, normalize, setLevel, setNetworkLocation, setParent, toString

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.apache.hadoop.net.Node

getLevel, getName, getNetworkLocation, getParent, setLevel, setNetworkLocation, setParent

Field Detail

LOG

public static final org.slf4j.Logger LOG

Method Detail

getSubtreeStorageCount

public int getSubtreeStorageCount(org.apache.hadoop.fs.StorageType type)

add

public boolean add(org.apache.hadoop.net.Node n)

Specified by:

add in interface org.apache.hadoop.net.InnerNode

Overrides:

add in class org.apache.hadoop.net.InnerNodeImpl

equals

public boolean equals(Object o)

Overrides:

equals in class org.apache.hadoop.net.InnerNodeImpl

hashCode

public int hashCode()

Overrides:

hashCode in class org.apache.hadoop.net.InnerNodeImpl

remove

public boolean remove(org.apache.hadoop.net.Node n)

Specified by:

remove in interface org.apache.hadoop.net.InnerNode

Overrides:

remove in class org.apache.hadoop.net.InnerNodeImpl

childAddStorage

public void childAddStorage(String childName,
                   org.apache.hadoop.fs.StorageType type)

Called by a child node of the current node to increment a storage count. lock is needed as different datanodes may call recursively to modify the same parent. TODO : this may not happen at all, depending on how heartheat is processed

Parameters:

childName - the name of the child that tries to add the storage type

type - the type being incremented.

childRemoveStorage

public void childRemoveStorage(String childName,
                      org.apache.hadoop.fs.StorageType type)

Called by a child node of the current node to decrement a storage count.

Parameters:

childName - the name of the child removing a storage type.

type - the type being removed.