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https://issues.apache.org/jira/browse/HDFS-2080?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13065645#comment-13065645
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Todd Lipcon commented on HDFS-2080:
-----------------------------------
Li Pi has been doing some investigation of read performance in HBase, and has
seen that RawLocalFileSystem performs over 2x better than the checksummed local
filesystem for random reads out of the linux FS cache. So, this JIRA should
have significant speed improvements for HBase.
> Speed up DFS read path by lessening checksum overhead
> -----------------------------------------------------
>
> Key: HDFS-2080
> URL: https://issues.apache.org/jira/browse/HDFS-2080
> Project: Hadoop HDFS
> Issue Type: Improvement
> Components: hdfs client
> Affects Versions: 0.23.0
> Reporter: Todd Lipcon
> Assignee: Todd Lipcon
> Fix For: 0.23.0
>
> Attachments: hdfs-2080.txt, hdfs-2080.txt
>
>
> I've developed a series of patches that speeds up the HDFS read path by a
> factor of about 2.5x (~300M/sec to ~800M/sec for localhost reading from
> buffer cache) and also will make it easier to allow for advanced users (eg
> hbase) to skip a buffer copy.
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