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https://issues.apache.org/jira/browse/HDFS-6930?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14120340#comment-14120340
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Colin Patrick McCabe commented on HDFS-6930:
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bq. Colin, I filed HDFS-6988 to make the thresholds configurable.
thanks
bq. updated patch attached to check capacity before division.
+1
> Improve replica eviction from RAM disk
> --------------------------------------
>
> Key: HDFS-6930
> URL: https://issues.apache.org/jira/browse/HDFS-6930
> Project: Hadoop HDFS
> Issue Type: Sub-task
> Components: datanode
> Affects Versions: HDFS-6581
> Reporter: Arpit Agarwal
> Assignee: Arpit Agarwal
> Attachments: HDFS-6930.01.patch, HDFS-6930.02.patch
>
>
> The current replica eviction scheme is inefficient since it performs multiple
> file operations in the context of block allocation.
> A better implementation would be asynchronous eviction when free space on RAM
> disk falls below a low watermark to make block allocation faster.
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