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https://issues.apache.org/jira/browse/HDFS-6988?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14142715#comment-14142715
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Arpit Agarwal commented on HDFS-6988:
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An absolute freespace setting does not work that well out of the box. Too high
and we waste free space on small ramdisks. Too low and we are letting cold data
occupy larger ramdisks and forcing newer writes to disk.
Adding an absolute upper limit to the percentage calculation would probably
address your concerns. I'll make a change.
> Make RAM disk eviction thresholds configurable
> ----------------------------------------------
>
> Key: HDFS-6988
> URL: https://issues.apache.org/jira/browse/HDFS-6988
> Project: Hadoop HDFS
> Issue Type: Sub-task
> Components: datanode
> Affects Versions: HDFS-6581
> Reporter: Arpit Agarwal
> Assignee: Arpit Agarwal
> Fix For: HDFS-6581
>
>
> Per feedback from [~cmccabe] on HDFS-6930, we can make the eviction
> thresholds configurable. The hard-coded thresholds may not be appropriate for
> very large RAM disks.
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