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From "Kihwal Lee (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-11742) Improve balancer usability after HDFS-8188
Date Fri, 05 May 2017 22:43:04 GMT

    [ https://issues.apache.org/jira/browse/HDFS-11742?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15999071#comment-15999071

Kihwal Lee commented on HDFS-11742:

bq.  Do you think that this is still a blocker of the release?
- HDFS-8188 has problems. It will affect many users, if it is included in a release as is.
I will -1 the release if the issue is not properly addressed.
- I believe this this jira (HDFS-11742) prevents hitting the issue. Thus this jira is a release
- IF HDFS-11742 is included alongwith HDFS-8188 and HDFS-11377, I will retract -1 on HDFS-8188.
If not, I will maintain -1.

Do you understand the nature of the issue and how it could affect people? If so, please review
the patch.

> 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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