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https://issues.apache.org/jira/browse/HDFS-9761?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Chris Nauroth updated HDFS-9761:
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Target Version/s: 2.8.0
Priority: Blocker (was: Minor)
I think we need to raise this to blocker status for release 2.8.0, considering
that the balancer is supposed to get faster in this version after patches like
HDFS-8818 and HDFS-8824.
[~ctrezzo] and [~mingma], would you mind reviewing this bug report since you
had done the work on HDFS-8890?
> 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
> Priority: Blocker
>
> 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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