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From "Todd Lipcon (Resolved) (JIRA)" <j...@apache.org>
Subject [jira] [Resolved] (HDFS-2080) Speed up DFS read path by lessening checksum overhead
Date Thu, 03 Nov 2011 07:01:35 GMT

     [ https://issues.apache.org/jira/browse/HDFS-2080?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Todd Lipcon resolved HDFS-2080.
-------------------------------

       Resolution: Fixed
    Fix Version/s: 0.23.1
     Hadoop Flags: Reviewed

All of the subtasks have now been completed and committed for 0.23.1 and 0.24. Thanks to those
that helped, especially Nathan, Kihwal, Eli, and Nicholas for the many reviews.
                
> 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, performance
>    Affects Versions: 0.23.0
>            Reporter: Todd Lipcon
>            Assignee: Todd Lipcon
>             Fix For: 0.24.0, 0.23.1
>
>         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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