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https://issues.apache.org/jira/browse/HADOOP-9655?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13705506#comment-13705506
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nemon lou commented on HADOOP-9655:
-----------------------------------
This patch has been tested on my cluster and has solved the problem.
> IPC Client call to the same host with multi thread takes very long time to
> report connection time out for many times
> ---------------------------------------------------------------------------------------------------------------------
>
> Key: HADOOP-9655
> URL: https://issues.apache.org/jira/browse/HADOOP-9655
> Project: Hadoop Common
> Issue Type: Bug
> Components: ipc
> Affects Versions: 2.0.4-alpha
> Reporter: nemon lou
> Attachments: HADOOP-9655.patch
>
>
> When one machine power off during running a job ,MRAppMaster find tasks timed
> out on that host and then call stop container for each container concurrently.
> But the IPC layer did it serially, for each call,the connection time out
> exception toke a few minutes to raise after 45 times reties. And AM hang for
> many hours to wait for stopContainer to finish.
> The jstack output file shows that most threads stuck at Connection.addCall
> waiting for a lock object hold by Connection.setupIOstreams.
> (The setupIOstreams method run slowlly becauseof connection time out during
> setupconnection.)
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