org.apache.hadoop.hdfs.server.balancer
Class MovedBlocks<L>

java.lang.Object
  org.apache.hadoop.hdfs.server.balancer.MovedBlocks<L>

Type Parameters:

L - Location type

public class MovedBlocks<L>
extends Object

This window makes sure to keep blocks that have been moved within a fixed time interval (default is 1.5 hour). Old window has blocks that are older; Current window has blocks that are more recent; Cleanup method triggers the check if blocks in the old window are more than the fixed time interval. If yes, purge the old window and then move blocks in current window to old window.

Nested Class Summary

static class

MovedBlocks.Locations<L> A class for keeping track of a block and its locations

Constructor Summary

MovedBlocks(long winTimeInterval)
initialize the moved blocks collection

Method Summary

void	cleanup() remove old blocks
boolean	contains(org.apache.hadoop.hdfs.protocol.Block block)
void	put(MovedBlocks.Locations<L> block) add a block thus marking a block to be moved

Methods inherited from class java.lang.Object

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

Constructor Detail

MovedBlocks

public MovedBlocks(long winTimeInterval)

initialize the moved blocks collection

Method Detail

put

public void put(MovedBlocks.Locations<L> block)

add a block thus marking a block to be moved

contains

public boolean contains(org.apache.hadoop.hdfs.protocol.Block block)

Returns:

if a block is marked as moved

cleanup

public void cleanup()

remove old blocks