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https://issues.apache.org/jira/browse/HDFS-9551?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15059469#comment-15059469
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BELUGA BEHR commented on HDFS-9551:
-----------------------------------
I do not mean this as a block-buster optimization, but the less thread
contention the better. I've wrote some unit tests on my local system that
demonstrate some small, but observable, improvements with four or more threads.
> 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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