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https://issues.apache.org/jira/browse/HDFS-3552?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13398632#comment-13398632
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Todd Lipcon commented on HDFS-3552:
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What's the use case for this?
> change the placement policy without restarting NameNode
> --------------------------------------------------------
>
> Key: HDFS-3552
> URL: https://issues.apache.org/jira/browse/HDFS-3552
> Project: Hadoop HDFS
> Issue Type: New Feature
> Reporter: Sho Shimauchi
>
> Pluggable placement policy was introduced into 0.21 as HDFS-385, but it would
> be more useful if user could change the placement policy without restarting
> NameNode.
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