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https://issues.apache.org/jira/browse/HDFS-8538?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14573975#comment-14573975
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Tsz Wo Nicholas Sze commented on HDFS-8538:
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> ... they almost always want the available space policy. ...
This statement may not be true. E.g. a disk with 2T free space and a disk with
1T free space, the 2T disk should not be more preferable than the 1T disk since
both of them have plenty of space.
> ... but we've always gotten complaints about uneven disk usage from customers
> with differently sized disks, ...
You will get more complaints for performance degradation after the change.
BTW, they should set the policy themselves or run balancer.
> Change the default volume choosing policy to
> AvailableSpaceVolumeChoosingPolicy
> -------------------------------------------------------------------------------
>
> Key: HDFS-8538
> URL: https://issues.apache.org/jira/browse/HDFS-8538
> Project: Hadoop HDFS
> Issue Type: Improvement
> Affects Versions: 2.7.0
> Reporter: Andrew Wang
> Assignee: Andrew Wang
> Attachments: hdfs-8538.001.patch
>
>
> For datanodes with different sized disks, they almost always want the
> available space policy. Users with homogenous disks are unaffected.
> Since this code has baked for a while, let's change it to be the default.
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