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https://issues.apache.org/jira/browse/HADOOP-6915?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12898025#action_12898025
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Jeff Hammerbacher commented on HADOOP-6915:
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In a magical world where ponies run free under rainbows, adding restart() as a
method to HDFS-326 would be another way to tackle this sort of problem.
> Add daemon restart option
> -------------------------
>
> Key: HADOOP-6915
> URL: https://issues.apache.org/jira/browse/HADOOP-6915
> Project: Hadoop Common
> Issue Type: Improvement
> Components: scripts
> Reporter: Nicolas Spiegelberg
> Priority: Minor
> Fix For: 0.22.0, 0.20-append
>
> Attachments: HADOOP-6915_0.20-append.patch, HADOOP-6915_0.22.patch
>
>
> With the addition of AvatarNode, we are working on a rolling restart option
> for upgrading a cluster. It seems that a generic restart option would be
> useful for this purpose and perhaps other administrative tasks. Add a
> 'restart' option to hadoop-daemon.sh and also modify 'slaves.sh' to run
> operations in parallel or serially.
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