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https://issues.apache.org/jira/browse/HADOOP-2975?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12602126#action_12602126
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Hairong Kuang commented on HADOOP-2975:
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I got a chance to talk to my coworker Ben about object allocation in Java. it
seemed we should not worry too much about the frequent small object allocation
since Java does a pretty good job on this. See
http://www-128.ibm.com/developerworks/java/library/j-jtp01274.html. Instead we
should try hard to avoid big object allocation.
> 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, Hadoop-2975-v2.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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