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https://issues.apache.org/jira/browse/HDFS-2012?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13117829#comment-13117829
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Konstantin Shvachko commented on HDFS-2012:
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In Balancer.initNodes(.) there is logic that classifies nodes 4 groups:
# underUtilied, whose utilization is less than avgUtilization - threshold
# utilized below average, whose utilization is < avgUtilization, but >=
(avgUtilization-threshold)
# utilized above average, whose utilization is > avgUtilization, but <=
(avgUtilization+threshold)
# overUtilied, whose utilization is > avgUtilization + threshold
The problem here is that if the node's utilization exactly = avgUtilization,
then it does not belong to any of the four groups and the assert kicks in.
The fix is to include such node to group 2 or 3. I'd prefer 3.
> Recurring failure of TestBalancer on branch-0.22
> ------------------------------------------------
>
> Key: HDFS-2012
> URL: https://issues.apache.org/jira/browse/HDFS-2012
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: balancer, test
> Affects Versions: 0.22.0
> Reporter: Aaron T. Myers
> Priority: Blocker
> Fix For: 0.22.0
>
> Attachments: TestBalancerLog.html
>
>
> This has been failing on Hudson for the last two builds and fails on my local
> box as well.
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