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https://issues.apache.org/jira/browse/WHIRR-645?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13440690#comment-13440690
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Andrew Bayer commented on WHIRR-645:
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+1
> Race condition between collocated namenode and jobtracker start/init services
> -----------------------------------------------------------------------------
>
> Key: WHIRR-645
> URL: https://issues.apache.org/jira/browse/WHIRR-645
> Project: Whirr
> Issue Type: Bug
> Components: core
> Affects Versions: 0.7.1
> Reporter: Graham Gear
> Priority: Minor
> Attachments: WHIRR-645.patch
>
>
> If the jobtracker role is defined before the namenode role on the same node
> (as per majority of the examples), the jobtracker service will poll for
> namenode and race the namenode HDFS dir config steps, often resulting in a
> failed write of 'mapred.system.dir' and a dead jobtracker process.
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