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From "Ming Ma (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HDFS-8647) Abstract BlockManager's rack policy into BlockPlacementPolicy
Date Tue, 23 Jun 2015 04:59:00 GMT
Ming Ma created HDFS-8647:

             Summary: Abstract BlockManager's rack policy into BlockPlacementPolicy
                 Key: HDFS-8647
                 URL: https://issues.apache.org/jira/browse/HDFS-8647
             Project: Hadoop HDFS
          Issue Type: Improvement
            Reporter: Ming Ma

Sometimes we want to have namenode use alternative block placement policy such as upgrade
domains in HDFS-7541.

BlockManager has built-in assumption about rack policy in functions such as useDelHint, blockHasEnoughRacks.
That means when we have new block placement policy, we need to modify BlockManager to account
for the new policy. Ideally BlockManager should ask BlockPlacementPolicy object instead. That
will allow us to provide new BlockPlacementPolicy without changing BlockManager.

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