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From "Vinayakumar B (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-8647) Abstract BlockManager's rack policy into BlockPlacementPolicy
Date Wed, 14 Oct 2015 17:22:05 GMT

    [ https://issues.apache.org/jira/browse/HDFS-8647?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14957311#comment-14957311
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Vinayakumar B commented on HDFS-8647:
-------------------------------------

bq. I was trying to point out that cherry-pick likely won't work. It is just to make sure
after I commit it to trunk, there is patch for reference in case I need to manually resolve
it as part of cherry-pick.
yes, correct. 
What i exactly meant is, currently there will be lot of difference, since EC is not merged
to branch-2. after that it would be easy to merge. Anyway I am okay if its okay to go with
different patch for branch-2.

> 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
>         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
>
>
> 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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