Ming Ma created HDFS-9006:
-----------------------------

             Summary: 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


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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