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https://issues.apache.org/jira/browse/HDFS-9608?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16360653#comment-16360653
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Vinayakumar B commented on HDFS-9608:
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Should this go to branch-2.8 (possibly 2.7) as well?
IMO, it should. Any other opinions?
> 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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