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https://issues.apache.org/jira/browse/HADOOP-6460?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12794144#action_12794144
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Suresh Srinivas commented on HADOOP-6460:
-----------------------------------------

buf.count() assuming you mean length of underlying byte array size is not 
exposed by ByteArrayOutputStream. setupResponse() is also called for 
Server.authFailedResponse. I do not think that grows to a large size, but 
having the log in setup response will make it generic for all streams. 

> 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-6460.5.patch, 
> hadoop-6460.6.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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