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From "Raghu Angadi (JIRA)" <j...@apache.org>
Subject [jira] Updated: (HADOOP-2758) Reduce memory copies when data is read from DFS
Date Fri, 18 Apr 2008 00:11:23 GMT

     [ https://issues.apache.org/jira/browse/HADOOP-2758?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Raghu Angadi updated HADOOP-2758:
---------------------------------

    Release Note: DataNode takes 50% less CPU while serving data to clients.  (was: DataNode
takes 50% less CPU while serving data to clients. Mention it to User : YES. )

> Reduce memory copies when data is read from DFS
> -----------------------------------------------
>
>                 Key: HADOOP-2758
>                 URL: https://issues.apache.org/jira/browse/HADOOP-2758
>             Project: Hadoop Core
>          Issue Type: Improvement
>          Components: dfs
>            Reporter: Raghu Angadi
>            Assignee: Raghu Angadi
>             Fix For: 0.17.0
>
>         Attachments: HADOOP-2758.patch, HADOOP-2758.patch, HADOOP-2758.patch, HADOOP-2758.patch,
HADOOP-2758.patch, HADOOP-2758.patch
>
>
> Currently datanode and client part of DFS perform multiple copies of data on the 'read
path' (i.e. path from storage on datanode to user buffer on the client). This jira reduces
these copies by enhancing data read protocol and implementation of read on both datanode and
the client. I will describe the changes in next comment.
> Requirement is that this fix should reduce CPU used and should not cause regression in
any benchmarks. It might not improve the benchmarks since most benchmarks are not cpu bound.

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