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https://issues.apache.org/jira/browse/HADOOP-2758?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Raghu Angadi updated HADOOP-2758:
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Description:
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.
was:
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.
Release Note: 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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