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From "Tsz Wo Nicholas Sze (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-11742) Improve balancer usability after HDFS-8188
Date Fri, 05 May 2017 22:59:04 GMT

    [ https://issues.apache.org/jira/browse/HDFS-11742?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15999083#comment-15999083
] 

Tsz Wo Nicholas Sze commented on HDFS-11742:
--------------------------------------------

> ...  If so, please review the patch.

I actually have looked at the patch.  I am not sure it is the right approach since the datanode
pairs are sorted by priorities according to the utilization and data locality.  The patch
tries to schedule the same number of threads to all pairs.

> Improve balancer usability after HDFS-8188
> ------------------------------------------
>
>                 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, HDFS-11742.branch-2.8.patch, HDFS-11742.branch-2.patch,
HDFS-11742.trunk.patch, HDFS-11742.v2.trunk.patch
>
>
> 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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