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https://issues.apache.org/jira/browse/HADOOP-4646?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12647174#action_12647174
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Amareshwari Sriramadasu commented on HADOOP-4646:
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Runping, Can you attach JobTracker log and one of stuck reducer log?
> Reduce stuck in pending state for ever even though the job tracker shows a
> lot of free slots
> --------------------------------------------------------------------------------------------
>
> Key: HADOOP-4646
> URL: https://issues.apache.org/jira/browse/HADOOP-4646
> Project: Hadoop Core
> Issue Type: Bug
> Components: mapred
> Affects Versions: 0.17.2
> Reporter: Runping Qi
>
> A job with 38 mappers and 38 reducers running on a cluster with 36 slots.
> All mapper tasks completed. 17 reducer tasks completed. 11 reducers are still
> in the running state
> and one is in the oending state and stay there forever.
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