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https://issues.apache.org/jira/browse/HADOOP-6460?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12793946#action_12793946
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Raghu Angadi commented on HADOOP-6460:
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How often the array shrinks and grows depends on how often the response the
high water mark (1MB in the patch). 10KB does not matter much if HWM is covers
most of the RPCs.
> Namenode runs of out of memory due to memory leak in ipc Server
> ---------------------------------------------------------------
>
> Key: HADOOP-6460
> URL: https://issues.apache.org/jira/browse/HADOOP-6460
> Project: Hadoop Common
> Issue Type: Bug
> Affects Versions: 0.20.1, 0.21.0, 0.22.0
> Reporter: Suresh Srinivas
> Assignee: Suresh Srinivas
> Priority: Blocker
> Fix For: 0.20.2, 0.21.0, 0.22.0
>
> Attachments: hadoop-6460.1.patch, hadoop-6460.patch
>
>
> Namenode heap usage grows disproportional to the number objects supports
> (files, directories and blocks). Based on heap dump analysis, this is due to
> large growth in ByteArrayOutputStream allocated in
> o.a.h.ipc.Server.Handler.run().
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