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https://issues.apache.org/jira/browse/HDFS-13283?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16450405#comment-16450405
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Lukas Majercak commented on HDFS-13283:
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LGTM too, the tests don't seem to be related. [~chris.douglas]?
> Percentage based Reserved Space Calculation for DataNode
> --------------------------------------------------------
>
> Key: HDFS-13283
> URL: https://issues.apache.org/jira/browse/HDFS-13283
> Project: Hadoop HDFS
> Issue Type: New Feature
> Components: datanode, hdfs
> Reporter: Lukas Majercak
> Assignee: Lukas Majercak
> Priority: Major
> Attachments: HDFS-13283.000.patch, HDFS-13283.001.patch,
> HDFS-13283.002.patch, HDFS-13283.003.patch, HDFS-13283.004.patch,
> HDFS-13283.005.patch, HDFS-13283.006.patch, HDFS-13283.007.patch
>
>
> Currently, the only way to configure reserved disk space for non-HDFS data on
> a DataNode is a constant value via {{dfs.datanode.du.reserved}}. This can be
> an issue in non-heterogeneous clusters where size of DNs can differ. The
> proposed solution is to allow percentage based configuration (and their
> combination):
> # ABSOLUTE
> ** based on absolute number of reserved space
> # PERCENTAGE
> ** based on percentage of total capacity in the storage
> # CONSERVATIVE
> ** calculates both of the above and takes the one that will yield more
> reserved space
> # AGGRESSIVE
> ** calculates 1. 2. and takes the one that will yield less reserved space
>
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