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From "Ming Ma (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HDFS-9007) Fix HDFS Balancer to honor upgrade domain policy
Date Tue, 03 Nov 2015 20:03:28 GMT

     [ https://issues.apache.org/jira/browse/HDFS-9007?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel

Ming Ma updated HDFS-9007:
    Attachment: HDFS-9007-branch-2.patch

Here is the patch for branch-2.

> Fix HDFS Balancer to honor upgrade domain policy
> ------------------------------------------------
>                 Key: HDFS-9007
>                 URL: https://issues.apache.org/jira/browse/HDFS-9007
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>            Reporter: Ming Ma
>            Assignee: Ming Ma
>         Attachments: HDFS-9007-2.patch, HDFS-9007-branch-2.patch, HDFS-9007.patch
> In the current design of HDFS Balancer, it doesn't use BlockPlacementPolicy used by namenode
runtime. Instead, it has somewhat redundant code to make sure block allocation conforms with
the rack policy.
> When namenode uses upgrade domain based policy, we need to make sure that HDFS balancer
doesn't move blocks in a way that could violate upgrade domain block placement policy.
> In the longer term, we should consider how to make Balancer independent of the actual
BlockPlacementPolicy as in HDFS-1431. 

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