[jira] Commented: (HADOOP-6460) Namenode runs of out of memory due to memory leak in ipc Server

["Suresh Srinivas (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/HADOOP-6460?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12792876#action_12792876 ] 

Suresh Srinivas commented on HADOOP-6460:
-----------------------------------------

This problem was introduced in Hadoop-4348 when the following line that resets ByteArrayOutputStream is accidentally removed:
{noformat}
-          buf.reset();
{noformat}

This results in growth of byte[] in ByteArrayOutputStream (which doubles in size every time it fills up).

> 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
>
>
> 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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