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https://issues.apache.org/jira/browse/HADOOP-6723?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12863725#action_12863725
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Jeff Hammerbacher commented on HADOOP-6723:
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Any reason this hasn't been committed yet?
> unchecked exceptions thrown in IPC Connection orphan clients
> ------------------------------------------------------------
>
> Key: HADOOP-6723
> URL: https://issues.apache.org/jira/browse/HADOOP-6723
> Project: Hadoop Common
> Issue Type: Bug
> Components: ipc
> Affects Versions: 0.20.2
> Reporter: Todd Lipcon
> Assignee: Todd Lipcon
> Priority: Critical
> Fix For: 0.21.0, 0.22.0
>
> Attachments: hadoop-6723.txt
>
>
> If the server sends back some malformed data, for example, receiveResponse()
> can end up with an incorrect call ID. Then, when it tries to find it in the
> calls map, it will end up with null and throw NPE in receiveResponse. This
> isn't caught anywhere, so the original IPC client ends up hanging forever
> instead of catching an exception. Another example is if the writable
> implementation itself throws an unchecked exception or OOME.
> We should catch Throwable in Connection.run() and shut down the connection if
> we catch one.
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