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From "Max Lapan (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HDFS-4420) Provide a way to exclude subtree from balancing process
Date Fri, 25 Jan 2013 12:41:13 GMT

     [ https://issues.apache.org/jira/browse/HDFS-4420?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel

Max Lapan updated HDFS-4420:

    Status: Patch Available  (was: Open)
> 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,
> 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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