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From "Harsh J (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-4420) Provide a way to exclude subtree from balancing process
Date Thu, 28 Feb 2013 17:43:14 GMT

    [ https://issues.apache.org/jira/browse/HDFS-4420?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13589701#comment-13589701
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Harsh J commented on HDFS-4420:
-------------------------------

Closed a dupe of this I'd unknowingly filed, i.e. HDFS-4509, but it had some additional federation
use points which solve this more elegantly, if anyone's interested.
                
> Provide a way to exclude subtree from balancing process
> -------------------------------------------------------
>
>                 Key: HDFS-4420
>                 URL: https://issues.apache.org/jira/browse/HDFS-4420
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>          Components: balancer
>            Reporter: Max Lapan
>            Priority: Minor
>         Attachments: Balancer-exclude-subtree-0.90.2.patch, Balancer-exclude-trunk.patch,
Balancer-exclude-trunk-v2.patch, Balancer-exclude-trunk-v3.patch
>
>
> During balancer operation, it balances all blocks, regardless of their filesystem hierarchy.
Sometimes, it would be usefull to exclude some subtree from balancing process.
> For example, regionservers data locality is cruical for HBase performance. Region's data
is tied to regionservers, which reside on specific machines in cluster. During operation,
regionservers reads and writes region's data, and after some time, all this data are reside
on local machine, so, all reads become local, which is great for performance. Balancer breaks
this locality during opertation by moving blocks around.
> This patch adds [-exclude <path>] switch, and, if path is provided,
> balancer will not move blocks under this path during operation.
> Attached patch have tested for 0.90.2.

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