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https://issues.apache.org/jira/browse/HADOOP-5145?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Hairong Kuang updated HADOOP-5145:
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Attachment: balancerOME.patch
Here is a patch that implements the old blocks purge strategy.
> 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
>
>
> 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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