[jira] [Updated] (HDFS-11742) Improve balancer usability after HDFS-8188

["Kihwal Lee (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/HDFS-11742?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Kihwal Lee updated HDFS-11742:
------------------------------
    Summary: Improve balancer usability after HDFS-8188  (was: Revert the core changes from HDFS-8818)

> 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
>         Attachments: balancer2.8.png, 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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