Package org.apache.hadoop.hdfs

Class PeerCache

java.lang.Object

org.apache.hadoop.hdfs.PeerCache

@Unstable
@Private
@VisibleForTesting
public class PeerCache
extends java.lang.Object

A cache of input stream sockets to Data Node.

Constructor Summary

Constructors

Constructor	Description
PeerCache(int c, long e)

Method Summary

Modifier and Type	Method	Description
Peer	get(DatanodeID dnId, boolean isDomain)	Get a cached peer connected to the given DataNode.
void	put(DatanodeID dnId, Peer peer)	Give an unused socket to the cache.
int	size()

Methods inherited from class java.lang.Object

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

Constructor Detail

PeerCache

public PeerCache(int c,
                 long e)

Method Detail

get

public Peer get(DatanodeID dnId,
                boolean isDomain)

Get a cached peer connected to the given DataNode.

Parameters:

dnId - The DataNode to get a Peer for.

isDomain - Whether to retrieve a DomainPeer or not.

Returns:

An open Peer connected to the DN, or null if none was found.

put

public void put(DatanodeID dnId,
                Peer peer)

Give an unused socket to the cache.

size

public int size()