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https://issues.apache.org/jira/browse/HDFS-1564?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12977649#action_12977649
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Konstantin Shvachko commented on HDFS-1564:
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The main discussion was in HADOOP-1463 with subsequent improvements in
HADOOP-2816, HADOOP-2549.
We used to have {{dfs.datanode.du.pct}}, which defined a percent of reserved
space per volume. This was originally intended for heterogeneous systems, but
caused controversy or was not understood well, and was removed by HADOOP-4430.
I don't see any other way to address the different volumes issue but to
reintroduce {{dfs.datanode.du.pct}}. If this is what the requester wants let
him specify the exact meaning of the parameter and its relation to the existing
ones.
> Make dfs.datanode.du.reserved configurable per volume
> -----------------------------------------------------
>
> Key: HDFS-1564
> URL: https://issues.apache.org/jira/browse/HDFS-1564
> Project: Hadoop HDFS
> Issue Type: New Feature
> Components: data-node
> Reporter: Aaron T. Myers
> Priority: Minor
>
> In clusters with DNs which have heterogeneous data dir volumes, it would be
> nice if dfs.datanode.du.reserved could be configured per-volume.
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