Stephen Chu created HDFS-4804:
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Summary: 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
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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