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From "Brahma Reddy Battula (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HDFS-11256) Rebalance specific directory
Date Fri, 16 Dec 2016 10:02:58 GMT

     [ https://issues.apache.org/jira/browse/HDFS-11256?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel

Brahma Reddy Battula updated HDFS-11256:
    Target Version/s:   (was: 3.0.0-alpha1)

> Rebalance specific directory
> ----------------------------
>                 Key: HDFS-11256
>                 URL: https://issues.apache.org/jira/browse/HDFS-11256
>             Project: Hadoop HDFS
>          Issue Type: New Feature
>          Components: balancer & mover
>    Affects Versions: 3.0.0-alpha1
>            Reporter: Amos Bird
> Currently hdfs only supports rebalancing over entire cluster. This might not be utilized
by data processing systems like hive, spark, impala etl. 
> In hive, we may need to maximize some fact tables IO performance by carefully sharding
their blocks evenly over all disks. Normally a INSERT SELECT is done to achieve such redistributing
> Given a table is backed by one directory on hdfs, rebalancing specific dir may be very

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