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Date: Fri, 17 Jun 2011 14:03:47 +0000 (UTC)
From: "Nathan Roberts (JIRA)" <jira@apache.org>
To: hdfs-issues@hadoop.apache.org
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Subject: [jira] [Commented] (HDFS-2080) Speed up DFS read path
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    [ https://issues.apache.org/jira/browse/HDFS-2080?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13051082#comment-13051082 ] 

Nathan Roberts commented on HDFS-2080:
--------------------------------------

very nice. And I'll bet cpu usage (CPU_SECONDS/MB) went down significantly as well. 

> 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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