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https://issues.apache.org/jira/browse/HDFS-8789?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15135414#comment-15135414
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Chris Trezzo commented on HDFS-8789:
------------------------------------
Also, here is the usage message for the command:
{noformat}
USAGE for Migrator:
-help
Displays this help message.
-placementpolicy
The target BlockPlacementPolicy that the migrator will migrate blocks
to. If not specified the migrator will use BlockPlacementPolicyDefault.
-fixblocks
Phase 3 dispatches block moves on the cluster. If this flag is not
specified, Phase 3 simply prints out the dry run moves, but does not dispatch
anything.
-blockpool [blockpoolid]
Only run the migrator on the specified block pool. If not specified,
the migrator will run on all blockpools.
-datanode [hostname]
Only run the migrator on the specified datanode. If not specified, the
migrator will run on all datanodes.
{noformat}
> 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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