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https://issues.apache.org/jira/browse/HDFS-1564?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13182009#comment-13182009
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Harsh J commented on HDFS-1564:
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I wonder if this still makes sense to have, and if we should just close it and
keep the existing behavior which seems to work well enough for many users (Not
many seem to seek nor complain over this).
Rita's way would incur too many configuration additions, considering that we
have DNs today with 8-12 disks or even more. Having a comma-list of
reservations is also expensive (and confusing) to maintain, and an admin can
easily make mistakes when adding/removing volumes to the data dir set.
I propose that we close this as Won't Fix for now, until there is sufficient
user-driven need again. I've simply not seen enough need for this, and setting
a reserved value across disks also makes sense.
> 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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