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From "Andrew Hancock (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (MAPREDUCE-3267) MR2 reduce tasks showing >100% complete
Date Mon, 23 Apr 2012 15:11:34 GMT

    [ https://issues.apache.org/jira/browse/MAPREDUCE-3267?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13259647#comment-13259647
] 

Andrew Hancock commented on MAPREDUCE-3267:
-------------------------------------------

I am experiencing this bug in version 0.22 as well.

It happens any time I turn on the following config in my job:

config.setFloat("mapreduce.reduce.input.buffer.percent", 0.1f);

If I remove this setting, the bug goes away.

When this option is turned on, the following symptoms are exhibited: 
1. During the reduce phase many of the reduce tasks will quickly read > 100%. The Job will
then report 100% complete.

2. I have on occasion seen it then go back below 100% on the overall progress. It will oscillate
between different numbers in that case.

3. The job appears to complete normally in spite of the progress reporting issues.
                
> MR2 reduce tasks showing >100% complete
> ---------------------------------------
>
>                 Key: MAPREDUCE-3267
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-3267
>             Project: Hadoop Map/Reduce
>          Issue Type: Bug
>          Components: mrv2, task
>    Affects Versions: 0.23.0
>            Reporter: Todd Lipcon
>            Assignee: Ravi Prakash
>
> My job is currently showing >100% reduce completion. Some reduce tasks are much higher
than 100% complete. they appear to be in the "last merge pass" stage

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