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https://issues.apache.org/jira/browse/MAPREDUCE-2962?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13100786#comment-13100786
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Todd Lipcon commented on MAPREDUCE-2962:
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There were a couple of "lost map output" errors here, but it's strange that the
web UI doesn't show the tasks moving back from Complete to Pending/Running
> Map percentage complete calculation incorrect
> ---------------------------------------------
>
> Key: MAPREDUCE-2962
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-2962
> Project: Hadoop Map/Reduce
> Issue Type: Bug
> Affects Versions: 0.20.203.0
> Reporter: Todd Lipcon
> Priority: Minor
>
> For some reason I have a job with 5000 map tasks, all of which are complete,
> and it's reporting 99.98% complete. The client logs show "map 100%" and then
> going back down to "map 99%".
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