[jira] [Commented] (MAPREDUCE-5194) Heed interrupts during Fetcher shutdown

["Arun C Murthy (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/MAPREDUCE-5194?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13684655#comment-13684655 ] 

Arun C Murthy commented on MAPREDUCE-5194:
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[~chris.douglas] some questions:

# Should we make openConnection synchronized and add an analogous (synchronized) closeConnection method? 
# In copyMapsFromHost should we check for stopped before we call openConnection?
# Also, should we call disconnect in the case stopped is true after the call to Fetcher.connect in copyMapsFromHost?

                
> 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
>            Assignee: Chris Douglas
>            Priority: Minor
>             Fix For: 2.1.0-beta
>
>         Attachments: M5194-1.patch, 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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