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https://issues.apache.org/jira/browse/HDFS-15294?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Jinglun reopened HDFS-15294:
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> Federation balance tool
> -----------------------
>
> Key: HDFS-15294
> URL: https://issues.apache.org/jira/browse/HDFS-15294
> Project: Hadoop HDFS
> Issue Type: New Feature
> Reporter: Jinglun
> Assignee: Jinglun
> Priority: Major
> Fix For: 3.4.0
>
> Attachments: BalanceProcedureScheduler.png, HDFS-15294.001.patch,
> HDFS-15294.002.patch, HDFS-15294.003.patch, HDFS-15294.003.reupload.patch,
> HDFS-15294.004.patch, HDFS-15294.005.patch, HDFS-15294.006.patch,
> HDFS-15294.007.patch, distcp-balance.pdf, distcp-balance.v2.pdf
>
>
> This jira introduces a new HDFS federation balance tool to balance data
> across different federation namespaces. It uses Distcp to copy data from the
> source path to the target path.
> The process is:
> 1. Use distcp and snapshot diff to sync data between src and dst until they
> are the same.
> 2. Update mount table in Router if we specified RBF mode.
> 3. Deal with src data, move to trash, delete or skip them.
> The design of fedbalance tool comes from the discussion in HDFS-15087.
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