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From "Aaron T. Myers (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-4804) WARN when users set the block balanced preference percent below 0.5 or above 1.0
Date Tue, 07 May 2013 21:35:17 GMT

    [ https://issues.apache.org/jira/browse/HDFS-4804?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13651333#comment-13651333
] 

Aaron T. Myers commented on HDFS-4804:
--------------------------------------

+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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