[jira] [Commented] (HDFS-8789) Block Placement policy migrator

["Chris Trezzo (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/HDFS-8789?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15995424#comment-15995424 ] 

Chris Trezzo commented on HDFS-8789:
------------------------------------

[~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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