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https://issues.apache.org/jira/browse/HDFS-2080?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13051164#comment-13051164
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Todd Lipcon commented on HDFS-2080:
-----------------------------------
Disabling checksum completely is about 16% faster than the hardware CRC.
My test to switch between them was to comment out the one line that calls the
hardware code and replace it with the one line that calls a fairly fast C
function. So there shouldn't be other factors in play that I can think of. Of
course more experimentation is quite welcome!
> Speed up DFS read path
> ----------------------
>
> 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
>
>
> 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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