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Xiao Chen commented on HDFS-8647: --------------------------------- Thanks a lot for the review and commit Zhe! > 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 > Assignee: Brahma Reddy Battula > Fix For: 2.8.0, 2.7.3, 2.6.4 > > Attachments: HDFS-8647-001.patch, HDFS-8647-002.patch, > HDFS-8647-003.patch, HDFS-8647-004.patch, HDFS-8647-004.patch, > HDFS-8647-005.patch, HDFS-8647-006.patch, HDFS-8647-007.patch, > HDFS-8647-008.patch, HDFS-8647-009.patch, HDFS-8647-branch26.patch, > HDFS-8647-branch27.patch > > > 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. -- This message was sent by Atlassian JIRA (v6.3.4#6332)