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From "Kihwal Lee (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-11742) Improve balancer usability after HDFS-8818
Date Thu, 20 Jul 2017 19:58:00 GMT

    [ https://issues.apache.org/jira/browse/HDFS-11742?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16095263#comment-16095263
] 

Kihwal Lee commented on HDFS-11742:
-----------------------------------

bq. do you think this is a blocker for 2.7.4 - it's marked as such?
It caused performance regression for us. The impact depends on the scale and the nature of
imbalance.  We would not run the new balancer (now back-ported to 2.7.4) without this. 

> Improve balancer usability after HDFS-8818
> ------------------------------------------
>
>                 Key: HDFS-11742
>                 URL: https://issues.apache.org/jira/browse/HDFS-11742
>             Project: Hadoop HDFS
>          Issue Type: Bug
>            Reporter: Kihwal Lee
>            Assignee: Kihwal Lee
>            Priority: Blocker
>              Labels: release-blocker
>         Attachments: balancer2.8.png, balancer_fix.png, HDFS-11742.branch-2.8.patch,
HDFS-11742.branch-2.patch, HDFS-11742.trunk.patch, HDFS-11742.v2.trunk.patch, replaceBlockNumOps-8w.jpg
>
>
> We ran 2.8 balancer with HDFS-8818 on a 280-node and a 2,400-node cluster. In both cases,
it would hang forever after two iterations. The two iterations were also moving things at
a significantly lower rate. The hang itself is fixed by HDFS-11377, but the design limitation
remains, so the balancer throughput ends up actually lower.
> Instead of reverting HDFS-8188 as originally suggested, I am making a small change to
make it less error prone and more usable.



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