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From "Hairong Kuang (JIRA)" <j...@apache.org>
Subject [jira] Updated: (HADOOP-5145) Balancer sometimes runs out of memory after days or weeks running
Date Wed, 04 Mar 2009 18:07:56 GMT

     [ https://issues.apache.org/jira/browse/HADOOP-5145?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel

Hairong Kuang updated HADOOP-5145:

    Attachment: balancerOME1.patch

The patch incorporates Nicholas' review comments.

> Balancer sometimes runs out of memory after days or weeks running
> -----------------------------------------------------------------
>                 Key: HADOOP-5145
>                 URL: https://issues.apache.org/jira/browse/HADOOP-5145
>             Project: Hadoop Core
>          Issue Type: Bug
>          Components: dfs
>            Reporter: Hairong Kuang
>            Assignee: Hairong Kuang
>             Fix For: 0.21.0
>         Attachments: balancerOME.patch, balancerOME1.patch
> The culprit is a HashMap called MovedBlocks. By design this map does not get cleaned
up between iterations. This is because the deletion of source replicas is done by NN. When
next iteration starts, source replicas may not have been deleted, Balancer does not want to
schedule them to move again. To prevent running out of memory, Balancer should expire/clean
the movedBlocks from some iterations back.

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