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https://issues.apache.org/jira/browse/HDFS-6988?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14158494#comment-14158494
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Colin Patrick McCabe commented on HDFS-6988:
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bq. If we are going with a single value can you suggest a default.
What we did in HDFS-4949 was to make the feature off by default, and require
admins (or management software) to configure it in order to use it. We could
adopt this approach for HDFS-6581 as well.
We already know that some configuration will be required, since sysadmins need
to set up the ramdisk. It will never be possible to simply upgrade your
software and immediately get HDFS-6581, since you won't have a ramdisk by
default. So making admins (or management software) set an HDFS configuration
key as well seems fine.
> Add configurable limit for percentage-based eviction threshold
> --------------------------------------------------------------
>
> 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
> Fix For: HDFS-6581
>
> Attachments: HDFS-6988.01.patch, HDFS-6988.02.patch
>
>
> 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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