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https://issues.apache.org/jira/browse/HADOOP-1702?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12596230#action_12596230
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Hadoop QA commented on HADOOP-1702:
-----------------------------------
+1 overall. Here are the results of testing the latest attachment
http://issues.apache.org/jira/secure/attachment/12381909/HADOOP-1702.patch
against trunk revision 655593.
+1 @author. The patch does not contain any @author tags.
+1 tests included. The patch appears to include 3 new or modified tests.
+1 javadoc. The javadoc tool did not generate any warning messages.
+1 javac. The applied patch does not increase the total number of javac
compiler warnings.
+1 findbugs. The patch does not introduce any new Findbugs warnings.
+1 release audit. The applied patch does not increase the total number of
release audit warnings.
+1 core tests. The patch passed core unit tests.
+1 contrib tests. The patch passed contrib unit tests.
Test results:
http://hudson.zones.apache.org/hudson/job/Hadoop-Patch/2452/testReport/
Findbugs warnings:
http://hudson.zones.apache.org/hudson/job/Hadoop-Patch/2452/artifact/trunk/build/test/findbugs/newPatchFindbugsWarnings.html
Checkstyle results:
http://hudson.zones.apache.org/hudson/job/Hadoop-Patch/2452/artifact/trunk/build/test/checkstyle-errors.html
Console output:
http://hudson.zones.apache.org/hudson/job/Hadoop-Patch/2452/console
This message is automatically generated.
> Reduce buffer copies when data is written to DFS
> ------------------------------------------------
>
> Key: HADOOP-1702
> URL: https://issues.apache.org/jira/browse/HADOOP-1702
> Project: Hadoop Core
> Issue Type: Bug
> Components: dfs
> Affects Versions: 0.14.0
> Reporter: Raghu Angadi
> Assignee: Raghu Angadi
> Fix For: 0.18.0
>
> Attachments: HADOOP-1702.patch, HADOOP-1702.patch, HADOOP-1702.patch,
> HADOOP-1702.patch, HADOOP-1702.patch, HADOOP-1702.patch, HADOOP-1702.patch,
> HADOOP-1702.patch, HADOOP-1702.patch
>
>
> HADOOP-1649 adds extra buffering to improve write performance. The following
> diagram shows buffers as pointed by (numbers). Each eatra buffer adds an
> extra copy since most of our read()/write()s match the io.bytes.per.checksum,
> which is much smaller than buffer size.
> {noformat}
> (1) (2) (3) (5)
> +---||----[ CLIENT ]---||----<>-----||---[ DATANODE ]---||--<>-> to Mirror
>
> | (buffer) (socket) | (4)
> | +--||--+
> ===== |
> ===== =====
> (disk) =====
> {noformat}
> Currently loops that read and write block data, handle one checksum chunk at
> a time. By reading multiple chunks at a time, we can remove buffers (1), (2),
> (3), and (5).
> Similarly some copies can be reduced when clients read data from the DFS.
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