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https://issues.apache.org/jira/browse/HDFS-8789?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15995424#comment-15995424
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Chris Trezzo commented on HDFS-8789:
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[~kihwal] [~zhz] I am not sure what your plans are to support migration from
one block placement policy to another (i.e. migrating from default to upgrade
domains), but I have a patch posted on this jira which contains the migrator
that we used to convert our clusters. It is definitely does not handle all use
cases, so I would be interested to hear your approaches as well. Thanks!
> Block Placement policy migrator
> -------------------------------
>
> Key: HDFS-8789
> URL: https://issues.apache.org/jira/browse/HDFS-8789
> Project: Hadoop HDFS
> Issue Type: New Feature
> Reporter: Chris Trezzo
> Assignee: Chris Trezzo
> Attachments: HDFS-8789-trunk-STRAWMAN-v1.patch
>
>
> As we start to add new block placement policies to HDFS, it will be necessary
> to have a robust tool that can migrate HDFS blocks between placement
> policies. This jira is for the design and implementation of that tool.
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