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https://issues.apache.org/jira/browse/HDFS-1564?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13596859#comment-13596859
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John Meza commented on HDFS-1564:
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I think dfs.datanode.du.pct works well for heterogeneous disks, especially when
the disks have a wide range of capacities. When disk capacities are the same
or very close dfs.datanode.du.pct or dfs.datanode.du.reserved would work.
Neither solve my needs well. I have an 8 DN cluster used for performance
testing. On occasion I need some or all of these machines for other tasks. It
would be great if could reserve 300Gb on a couple of disks. Not all of the
disks, just a couple.
Maintaining a comma-list can lead to mistakes, especially for DNs with more
than a couple of disks. To simplify this identify reserve for specific disks,
all others default to a value.
For example, a DN with 8 disks: /fs1,/fs2,../fs8.
<name>dfs.datanode.du.reserved</name>
<value>10737418240, /fs1/dfs/dn:322122547200,
/fs2/dfs/dn:322122547200</value>
This reserves /fs1=300Gb, /fs2=300Gb, all others default=10Gb
> 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: datanode
> 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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