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From "Devaraj Das (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-5289) Tasks are not scheduled even though task trackers have extra slots
Date Fri, 20 Feb 2009 04:04:03 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-5289?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12675230#action_12675230

Devaraj Das commented on HADOOP-5289:

Runping, did the pending tasks finally run when the other reducers completed or they remained
in the PENDING state for ever ?

> 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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