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