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https://issues.apache.org/jira/browse/HADOOP-4646?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12647230#action_12647230
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Amareshwari Sriramadasu commented on HADOOP-4646:
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Runping, Is the log you pasted is for a running reducer or is it for a
failed/completed one?
bq. 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.
Out of 38 reducers, you gave the state of 29 reducers here. what happened to
the other 9 reducers? Are they not shown in the UI at all?
> 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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