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From "Yongjun Zhang (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-6133) Make Balancer support exclude specified path
Date Fri, 20 Feb 2015 13:36:15 GMT

    [ https://issues.apache.org/jira/browse/HDFS-6133?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14328914#comment-14328914
] 

Yongjun Zhang commented on HDFS-6133:
-------------------------------------

HI [~cmccabe],

My understanding is that HDFS-4420's approach is a passive "pinning": it tells balancer not
to move the blocks belonging to a specified file path; on the other hand, HDFS-6133 proactively
pin the blocks at write time by specifying favored nodes. I think if we do passive "pinning"
after the the blocks of a file have been moved by balancer, then it may not be preferred behavior.
Hi [~zhaoyunjiong], would you please share your thoughts when you started with this approach
when HDFS-4420's patch was already there?

Hi [~szetszwo] and [~zhaoyunjiong], about HDFS-6133, I was wondering whether there is any
compatibility issue when we do rolling upgrade? There are API changes at {{DataTansferProtocol#writeBlock}},
what would happen if DNs with HDFS-6133 (trying to pin) talks to DNs without the fix? Would
you please comment? 

Thanks.


> Make Balancer support exclude specified path
> --------------------------------------------
>
>                 Key: HDFS-6133
>                 URL: https://issues.apache.org/jira/browse/HDFS-6133
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>          Components: balancer & mover, datanode
>            Reporter: zhaoyunjiong
>            Assignee: zhaoyunjiong
>             Fix For: 2.7.0
>
>         Attachments: HDFS-6133-1.patch, HDFS-6133-10.patch, HDFS-6133-11.patch, HDFS-6133-2.patch,
HDFS-6133-3.patch, HDFS-6133-4.patch, HDFS-6133-5.patch, HDFS-6133-6.patch, HDFS-6133-7.patch,
HDFS-6133-8.patch, HDFS-6133-9.patch, HDFS-6133.patch
>
>
> Currently, run Balancer will destroying Regionserver's data locality.
> If getBlocks could exclude blocks belongs to files which have specific path prefix, like
"/hbase", then we can run Balancer without destroying Regionserver's data locality.



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