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From "Doug Cutting (JIRA)" <j...@apache.org>
Subject [jira] Updated: (HADOOP-1077) Race condition in fetching map outputs (might lead to hung reduces)
Date Wed, 07 Mar 2007 23:15:24 GMT

     [ https://issues.apache.org/jira/browse/HADOOP-1077?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Doug Cutting updated HADOOP-1077:
---------------------------------

    Resolution: Fixed
        Status: Resolved  (was: Patch Available)

I just committed this.  Thanks, Devaraj!

> Race condition in fetching map outputs (might lead to hung reduces)
> -------------------------------------------------------------------
>
>                 Key: HADOOP-1077
>                 URL: https://issues.apache.org/jira/browse/HADOOP-1077
>             Project: Hadoop
>          Issue Type: Bug
>          Components: mapred
>            Reporter: Devaraj Das
>         Assigned To: Devaraj Das
>            Priority: Blocker
>             Fix For: 0.12.1
>
>         Attachments: 1077.2.patch, 1077.patch
>
>
> Sometimes when a map task is lost while the map-output fetch is happening from the TT
for that task, and the lost map has successfully executed on some other node, the event for
that successful execution is lost at the fetching TT. The fetching TT might eventually fail
to fetch the output for the lost task, but then since the event for the new run of the lost
map might also have been lost, the fetching TT might hang.
> This "hung" problem was discovered while working on HADOOP-1060.

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