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https://issues.apache.org/jira/browse/HDFS-9608?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16365171#comment-16365171
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Brahma Reddy Battula commented on HDFS-9608:
--------------------------------------------

Yes, It's nice to have.

> Disk IO imbalance in HDFS with heterogeneous storages
> -----------------------------------------------------
>
>                 Key: HDFS-9608
>                 URL: https://issues.apache.org/jira/browse/HDFS-9608
>             Project: Hadoop HDFS
>          Issue Type: Bug
>    Affects Versions: 2.6.0
>            Reporter: Wei Zhou
>            Assignee: Wei Zhou
>            Priority: Major
>             Fix For: 2.9.0, 3.0.0-alpha1
>
>         Attachments: HDFS-9608.01.patch, HDFS-9608.02.patch, 
> HDFS-9608.03.patch, HDFS-9608.04.patch, HDFS-9608.05.patch, 
> HDFS-9608.06.patch, HDFS-9608.07.patch
>
>
> Currently RoundRobinVolumeChoosingPolicy use a shared index to choose volumes 
> in HDFS with heterogeneous storages, this leads to non-RR choosing mode for 
> certain type of storage.
> Besides, it uses a shared lock for synchronization which limits the 
> concurrency of volume choosing process. Volume choosing threads that 
> operating on different storage types should be able to run concurrently. 



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