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https://issues.apache.org/jira/browse/HDFS-6046?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13918861#comment-13918861
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Colin Patrick McCabe commented on HDFS-6046:
--------------------------------------------
I also fixed a few cases where the values in hdfs-default.xml did not agree
with those in DFSConfig.java
> add dfs.client.mmap.enabled
> ---------------------------
>
> Key: HDFS-6046
> URL: https://issues.apache.org/jira/browse/HDFS-6046
> Project: Hadoop HDFS
> Issue Type: Sub-task
> Components: hdfs-client
> Affects Versions: 2.4.0
> Reporter: Colin Patrick McCabe
> Attachments: HDFS-6046.001.patch, HDFS-6046.002.patch
>
>
> It would be nice to have a configuration variable, dfs.client.mmap.enabled.
> which would disable mmap reads in the client. This could come in handy for
> debugging or performance benchmarking.
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