[
https://issues.apache.org/jira/browse/HADOOP-2758?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Raghu Angadi updated HADOOP-2758:
---------------------------------
Attachment: HADOOP-2758.patch
Thank Konstantin. Update patch includes all the changes.
regd sendBuf and maxChunksPerPacket: these are made local to sendBlock(), I
think thats what you meant (instead of sendChunks(), which invoked in
sendBlock() in a loop).
Will make this patch available once DFSIO benchmark shows the buffering is same
as before.
> 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
>
>
> 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.
--
This message is automatically generated by JIRA.
-
You can reply to this email to add a comment to the issue online.
