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From "Arpit Agarwal (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-8647) Abstract BlockManager's rack policy into BlockPlacementPolicy
Date Thu, 03 Dec 2015 21:29:11 GMT

    [ https://issues.apache.org/jira/browse/HDFS-8647?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15038624#comment-15038624
] 

Arpit Agarwal commented on HDFS-8647:
-------------------------------------

bq. a. After change, auto replication (if single rack have already enough replicas == RF)
will not happen when the cluster is added with one more rack. Only this will be triggered
only if RF changes on those blocks.
Hi [~brahmareddy], does this mean we have a change of behavior in 2.6/2.7 after HDFS-8647
until HDFS-9127 is fixed? Thanks.

> 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.



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