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From "Tsz Wo Nicholas Sze (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-11742) Revert the core changes from HDFS-8818
Date Tue, 02 May 2017 22:30:04 GMT

    [ https://issues.apache.org/jira/browse/HDFS-11742?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15993912#comment-15993912
] 

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

What we need is HDFS-7639.  The number of moves should be limited by the number of threads.

> Revert the core changes from 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
>         Attachments: HDFS-11742.branch-2.8.patch, HDFS-11742.branch-2.patch, HDFS-11742.trunk.patch
>
>
> This is to revert the core changes made by HDFS-8818. The reason is explained in the
jira comments.  HDFS-8818 put in config and logging changes that are tied to the core change.
I will leave them as is.
> 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.



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