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Posted to hdfs-issues@hadoop.apache.org by "Todd Lipcon (Updated) (JIRA)" <ji...@apache.org> on 2011/10/21 08:06:40 UTC

[jira] [Updated] (HDFS-2080) Speed up DFS read path by lessening checksum overhead

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

Todd Lipcon updated HDFS-2080:
------------------------------

    Component/s: performance
    
> 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: 0.23.0
>
>         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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