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From "Walter Su (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-8647) Abstract BlockManager's rack policy into BlockPlacementPolicy
Date Mon, 29 Jun 2015 12:19:04 GMT

    [ https://issues.apache.org/jira/browse/HDFS-8647?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14605532#comment-14605532
] 

Walter Su commented on HDFS-8647:
---------------------------------

thanks for filing this [~mingma].

I'm afraid the whole patch is huge. So I break the task to pieces. Since BlockManager is critical
code and we should be careful. I prefer do it step by step. It also make review easier. Hope
you're ok with that.

> 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: Walter Su
>
> 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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