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From "Raghu Angadi (JIRA)" <j...@apache.org>
Subject [jira] Created: (HADOOP-2758) Reduce memory copies when data is read from DFS
Date Thu, 31 Jan 2008 21:25:09 GMT
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

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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