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https://issues.apache.org/jira/browse/HDFS-9761?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15133625#comment-15133625
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Mingliang Liu commented on HDFS-9761:
-------------------------------------
{{hadoop.hdfs.TestRollingUpgrade}} seems flaky and is tracked by [HDFS-9664].
Other failing tests seem unrelated so I filed individual jiras.
* {{TestBlockScanner}} is tracked by [HDFS-9765]
* {{TestDataNodeMetrics#testDataNodeTimeSpend}} by [HDFS-9766]
* {{TestFileAppend#testMultipleAppends}} by [HDFS-9767]
> Rebalancer sleeps too long between iterations
> ---------------------------------------------
>
> Key: HDFS-9761
> URL: https://issues.apache.org/jira/browse/HDFS-9761
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: balancer & mover
> Reporter: Adrian Bridgett
> Assignee: Mingliang Liu
> Priority: Blocker
> Attachments: HDFS-9761.000.patch
>
>
> Whilst reading the code to try and determine why I'm seeing bad performance I
> think I've spotted an inadvertent move of a sleep() to inside a for loop.
> This means that instead of sleeping once per iteration the balance is
> sleeping once per namenode per iteration. If I've done my maths correctly
> the sleep time default is 18seconds so this is a nice little speedup for HA
> clusters.
> Commit d31a41c35927f02f2fb40d19380b5df4bb2b6d57 moved the sleep in
> org/apache/hadoop/hdfs/server/balancer/Balancer.java:run()
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