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https://issues.apache.org/jira/browse/HDFS-9006?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14954023#comment-14954023
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Ming Ma commented on HDFS-9006:
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Thanks [~eddyxu] and [~ctrezzo]!
> Provide BlockPlacementPolicy that supports upgrade domain
> ---------------------------------------------------------
>
> Key: HDFS-9006
> URL: https://issues.apache.org/jira/browse/HDFS-9006
> Project: Hadoop HDFS
> Issue Type: Sub-task
> Reporter: Ming Ma
> Assignee: Ming Ma
> Fix For: 3.0.0, 2.8.0
>
> Attachments: HDFS-9006-2.patch, HDFS-9006-3.patch, HDFS-9006.patch
>
>
> As part of the upgrade domain feature, we need to provide the actual upgrade
> domain block placement.
> Namenode provides a mechanism to specify custom block placement policy. We
> can use that to implement BlockPlacementPolicy with upgrade domain support.
> {noformat}
> <property>
> <name>dfs.block.replicator.classname</name>
> <value>org.apache.hadoop.hdfs.server.blockmanagement.BlockPlacementPolicyWithUpgradeDomain</value>
> </property>
> {noformat}
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