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https://issues.apache.org/jira/browse/HADOOP-8986?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13485238#comment-13485238
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Robert Joseph Evans commented on HADOOP-8986:
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This can save several hundred MB on an AM with many reduce tasks.
> Server$Call object is never released after it is sent
> -----------------------------------------------------
>
> Key: HADOOP-8986
> URL: https://issues.apache.org/jira/browse/HADOOP-8986
> Project: Hadoop Common
> Issue Type: Bug
> Components: ipc
> Affects Versions: 2.0.2-alpha, 0.23.4
> Reporter: Robert Joseph Evans
> Assignee: Robert Joseph Evans
> Priority: Critical
>
> When an IPC response cannot be returned without blocking the Server$Call
> object attached to the SelectionKey of the write selector. However the call
> object is never removed from the SlectionKey. So for a connection that rarely
> has large responses but is long lived there is a lot of data.
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