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https://issues.apache.org/jira/browse/HDFS-12011?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16061785#comment-16061785
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chencan commented on HDFS-12011:
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Thank you for your reply. I found fsvolume's reference count may
increase/decrease during every read and write process. So i think this can
represent the load on the disk. It seems thoughtless. I have tested it in my
environment using hibench dfsioe,the performance of this policy is not better
than other ones. I think part of the reason is dfsioe's test filesize is equal.
May be this policy is a choice in a complex situation where the disk load is
uneven.
> Add a new load balancing volume choosing policy
> ------------------------------------------------
>
> Key: HDFS-12011
> URL: https://issues.apache.org/jira/browse/HDFS-12011
> Project: Hadoop HDFS
> Issue Type: Improvement
> Components: datanode
> Reporter: chencan
> Assignee: chencan
> Attachments: HADOOP-12011.002.path, HADOOP-12011.patch
>
>
> There are two types of volume choosing policies when choose a volume
> inner a datanode to write in a datablock : RoundRobinVolumeChoosingPolicy and
> AvailableSpaceVolumeChoosingPolicy.This two policies do not take into account
> the fsvolume's load. We can add a new load balancing volume choosing policy,
> using existing reference in FsVolumeImpl.
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