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https://issues.apache.org/jira/browse/HADOOP-2975?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12601212#action_12601212
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Hairong Kuang commented on HADOOP-2975:
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The patch looks good. But one disadvantage is that it keeps on growing the
buffer size but never shrinking it. One solution could be we allocate a big
enough buffer which should fit most requests. For a bigger size request, we do
dynamic allocation then throw it away after serialization.
> IPC server should not allocate a buffer for each request
> --------------------------------------------------------
>
> Key: HADOOP-2975
> URL: https://issues.apache.org/jira/browse/HADOOP-2975
> Project: Hadoop Core
> Issue Type: Improvement
> Components: ipc
> Affects Versions: 0.16.0
> Reporter: Hairong Kuang
> Attachments: Hadoop-2975-v1.patch
>
>
> Currently the IPC server allocates a buffer for each incoming request. The
> buffer is thrown away after the request is serialized. This leads to very
> inefficient heap utilization. It would be nicer if all requests from one
> connection could share a same common buffer since the ipc server has only one
> request is being read from a socket at a time.
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