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https://issues.apache.org/jira/browse/HADOOP-5289?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12675239#action_12675239
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Runping Qi commented on HADOOP-5289:
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the pending tasks finally got scheduled.
> Tasks are not scheduled even though task trackers have extra slots
> ------------------------------------------------------------------
>
> Key: HADOOP-5289
> URL: https://issues.apache.org/jira/browse/HADOOP-5289
> Project: Hadoop Core
> Issue Type: Bug
> Components: mapred
> Affects Versions: 0.19.0
> Reporter: Runping Qi
>
> I ran a job with 51 reduce tasks on a cluster with 13 task trackers running
> Hadoop 0.19. Each task tracker has 5 reduce slots.
> Initially, each task tracker accepted 4 reduce tasks as expected. However, 3
> task trackers were put into blacklist because many tasks failed on them.
> However, those failed tasks stayed in pending state, not being scheduled to
> other task trackers, even though each of the other healthy tracker has one
> free slot.
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