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https://issues.apache.org/jira/browse/HDFS-4804?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13651333#comment-13651333
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Aaron T. Myers commented on HDFS-4804:
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+1, the patch looks good to me. I'm going to commit this momentarily.
> WARN when users set the block balanced preference percent below 0.5 or above
> 1.0
> --------------------------------------------------------------------------------
>
> Key: HDFS-4804
> URL: https://issues.apache.org/jira/browse/HDFS-4804
> Project: Hadoop HDFS
> Issue Type: Improvement
> Affects Versions: 2.0.4-alpha
> Reporter: Stephen Chu
> Assignee: Stephen Chu
> Priority: Minor
> Attachments: HDFS-4804.patch
>
>
> With the new feature added in HDFS-1804 (Add a new block-volume device
> choosing policy that looks at free space), it'd be useful to have a WARN log
> if the operator sets
> dfs.datanode.fsdataset.volume.choosing.balanced-space-preference-percent to a
> value greater than 1.0. This might happen if the operator mistakenly assumes
> that this setting takes in a percentage number from 0.0-100.0, while the
> setting actually takes a range 0.0-1.0.
> Also, it'd be useful to WARN in the case that value is set below 0.5, which
> would cause disks with less free space to get more block allocations.
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