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From "He Tianyi (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (MAPREDUCE-6757) Multithreaded mapper corrupts buffer pusher in nativetask
Date Tue, 16 Aug 2016 10:08:20 GMT

     [ https://issues.apache.org/jira/browse/MAPREDUCE-6757?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

He Tianyi updated MAPREDUCE-6757:
---------------------------------
    Attachment: MAPREDUCE-6757.0000.patch

> Multithreaded mapper corrupts buffer pusher in nativetask
> ---------------------------------------------------------
>
>                 Key: MAPREDUCE-6757
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-6757
>             Project: Hadoop Map/Reduce
>          Issue Type: Bug
>          Components: nativetask
>    Affects Versions: 3.0.0-alpha1
>            Reporter: He Tianyi
>         Attachments: MAPREDUCE-6757.0000.patch
>
>
> Multiple threads could be calling {{collect}} method of the same {{NativeMapOutputCollectorDelegator}}
instance at the same time. In this case, buffer can be corrupted.
> This may occur when executing Hive queries with custom script.
> Adding 'synchronized' keyword to {{collect}} method would solve the problem.



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