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https://issues.apache.org/jira/browse/HDFS-9551?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15060139#comment-15060139
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BELUGA BEHR commented on HDFS-9551:
-----------------------------------

Like many of these things, I don't think this testing is meaningful for any one 
configuration. Choice is good and this simply rounds out the available volume 
load-balancing algorithms a bit more.  I'm not going to fight to see this 
introduced, but as always, I appreciate the interest!

> Random VolumeChoosingPolicy
> ---------------------------
>
>                 Key: HDFS-9551
>                 URL: https://issues.apache.org/jira/browse/HDFS-9551
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>          Components: datanode
>    Affects Versions: 2.7.1
>            Reporter: BELUGA BEHR
>            Priority: Minor
>         Attachments: RandomVolumeChoosingPolicy.java, 
> TestRandomVolumeChoosingPolicy.java
>
>
> Please find attached a new implementation of VolumeChoosingPolicy.  This 
> implementation chooses volumes at random to place blocks.  It is thread-safe 
> and un-synchronized so there is less thread contention.



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