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https://issues.apache.org/jira/browse/HADOOP-9703?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13702766#comment-13702766
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Colin Patrick McCabe commented on HADOOP-9703:
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I don't think we want one of these per client. You might consider moving the
SEND_PARAMS_EXECUTOR into the ClientCache, and having that cache pass it into
the constructor of {{org.apache.hadoop.ipc.Client}}.
Alternately, you could have some kind of reference-counted static object inside
the Client class. That would involve fewer code changes.
> org.apache.hadoop.ipc.Client leaks threads on stop.
> ---------------------------------------------------
>
> Key: HADOOP-9703
> URL: https://issues.apache.org/jira/browse/HADOOP-9703
> Project: Hadoop Common
> Issue Type: Bug
> Reporter: Mark Miller
> Assignee: Tsuyoshi OZAWA
> Priority: Minor
>
> org.apache.hadoop.ipc.Client#stop says "Stop all threads related to this
> client." but does not shutdown the static SEND_PARAMS_EXECUTOR, so usage of
> this class always leaks threads rather than cleanly closing or shutting down.
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