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From "Chris Douglas (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (MAPREDUCE-5194) Heed interrupts during Fetcher shutdown
Date Wed, 01 May 2013 03:56:16 GMT

     [ https://issues.apache.org/jira/browse/MAPREDUCE-5194?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Chris Douglas updated MAPREDUCE-5194:
-------------------------------------

    Status: Open  (was: Patch Available)

The approach is incorrect. Interruption of {{InputStream}} requires closing the stream out
of band and relying on the {{SocketException}} to terminate the thread.
                
> Heed interrupts during Fetcher shutdown
> ---------------------------------------
>
>                 Key: MAPREDUCE-5194
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-5194
>             Project: Hadoop Map/Reduce
>          Issue Type: Task
>          Components: task
>            Reporter: Chris Douglas
>            Priority: Minor
>         Attachments: M5194.patch
>
>
> In the current implementation, {{Fetcher}} instances usually exit gracefully when the
shuffle succeeds. When it fails, threads are interrupted, but may continue running harmlessly
until the JVM shuts down.
> However, to generate consistent checkpoints, these threads should exit cleanly to quiesce
the state of the shuffle.

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