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From "Hudson (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-1312) Re-balance disks within a Datanode
Date Fri, 24 Jun 2016 06:20:21 GMT

    [ https://issues.apache.org/jira/browse/HDFS-1312?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15347802#comment-15347802

Hudson commented on HDFS-1312:

SUCCESS: Integrated in Hadoop-trunk-Commit #10014 (See [https://builds.apache.org/job/Hadoop-trunk-Commit/10014/])
HDFS-8821. Stop tracking CHANGES.txt in the HDFS-1312 feature branch. (arp: rev 4b93ddae07ba4332f40f896542ee2c6d7bf899ed)
* hadoop-hdfs-project/hadoop-hdfs/pom.xml
* hadoop-hdfs-project/hadoop-hdfs/HDFS-1312_CHANGES.txt
Fix a build break in HDFS-1312 (arp: rev 9be9703716d2787cd6ee0ebbbe44a18b1f039018)
* hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/diskbalancer/DiskBalancerException.java

> Re-balance disks within a Datanode
> ----------------------------------
>                 Key: HDFS-1312
>                 URL: https://issues.apache.org/jira/browse/HDFS-1312
>             Project: Hadoop HDFS
>          Issue Type: New Feature
>          Components: datanode
>            Reporter: Travis Crawford
>            Assignee: Anu Engineer
>         Attachments: Architecture_and_test_update.pdf, Architecture_and_testplan.pdf,
HDFS-1312.001.patch, HDFS-1312.002.patch, HDFS-1312.003.patch, HDFS-1312.004.patch, HDFS-1312.005.patch,
HDFS-1312.006.patch, HDFS-1312.007.patch, disk-balancer-proposal.pdf
> Filing this issue in response to ``full disk woes`` on hdfs-user.
> Datanodes fill their storage directories unevenly, leading to situations where certain
disks are full while others are significantly less used. Users at many different sites have
experienced this issue, and HDFS administrators are taking steps like:
> - Manually rebalancing blocks in storage directories
> - Decomissioning nodes & later readding them
> There's a tradeoff between making use of all available spindles, and filling disks at
the sameish rate. Possible solutions include:
> - Weighting less-used disks heavier when placing new blocks on the datanode. In write-heavy
environments this will still make use of all spindles, equalizing disk use over time.
> - Rebalancing blocks locally. This would help equalize disk use as disks are added/replaced
in older cluster nodes.
> Datanodes should actively manage their local disk so operator intervention is not needed.

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