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https://issues.apache.org/jira/browse/HADOOP-3915?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12620518#action_12620518
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Devaraj Das commented on HADOOP-3915:
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Is the problem to do with reducers waiting happening consistently?
> reducers hang, jobtracker loosing completely track of them.
> -----------------------------------------------------------
>
> Key: HADOOP-3915
> URL: https://issues.apache.org/jira/browse/HADOOP-3915
> Project: Hadoop Core
> Issue Type: Bug
> Affects Versions: 0.17.1
> Environment: EC2, Debian Etch (but not the ec2-contrib stuff)
> streaming.jar
> Reporter: Andreas Kostyrka
> Fix For: 0.17.2
>
>
> I just noticed the following curious situation:
> -) 18 of 22 reducers are waiting for 3 hours or so with 0.01MB/s and no
> progress.
> -) hadoop job -kill-task does not work on the ids shown
> -) killing all reduce work tasks (the spawned Python processes, not java
> TaskTracker$Child) gets completely ignored by the JobTracker, the jobtracker
> shows them still as running.
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