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https://issues.apache.org/jira/browse/HADOOP-10681?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14049715#comment-14049715
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Hadoop QA commented on HADOOP-10681:
------------------------------------
{color:red}-1 overall{color}. Here are the results of testing the latest
attachment
http://issues.apache.org/jira/secure/attachment/12653542/HADOOP-10681.2.patch
against trunk revision .
{color:green}+1 @author{color}. The patch does not contain any @author
tags.
{color:green}+1 tests included{color}. The patch appears to include 1 new
or modified test files.
{color:green}+1 javac{color}. The applied patch does not increase the
total number of javac compiler warnings.
{color:green}+1 javadoc{color}. There were no new javadoc warning messages.
{color:green}+1 eclipse:eclipse{color}. The patch built with
eclipse:eclipse.
{color:red}-1 findbugs{color}. The patch appears to introduce 4 new
Findbugs (version 1.3.9) warnings.
{color:green}+1 release audit{color}. The applied patch does not increase
the total number of release audit warnings.
{color:green}+1 core tests{color}. The patch passed unit tests in
hadoop-common-project/hadoop-common.
{color:green}+1 contrib tests{color}. The patch passed contrib unit tests.
Test results:
https://builds.apache.org/job/PreCommit-HADOOP-Build/4197//testReport/
Findbugs warnings:
https://builds.apache.org/job/PreCommit-HADOOP-Build/4197//artifact/trunk/patchprocess/newPatchFindbugsWarningshadoop-common.html
Console output:
https://builds.apache.org/job/PreCommit-HADOOP-Build/4197//console
This message is automatically generated.
> Remove synchronized blocks from SnappyCodec and ZlibCodec buffering inner loop
> ------------------------------------------------------------------------------
>
> Key: HADOOP-10681
> URL: https://issues.apache.org/jira/browse/HADOOP-10681
> Project: Hadoop Common
> Issue Type: Bug
> Components: performance
> Affects Versions: 2.2.0, 2.4.0, 2.5.0
> Reporter: Gopal V
> Assignee: Gopal V
> Labels: perfomance
> Attachments: HADOOP-10681.1.patch, HADOOP-10681.2.patch,
> compress-cmpxchg-small.png, perf-top-spill-merge.png, snappy-perf-unsync.png
>
>
> The current implementation of SnappyCompressor spends more time within the
> java loop of copying from the user buffer into the direct buffer allocated to
> the compressor impl, than the time it takes to compress the buffers.
> !perf-top-spill-merge.png!
> The bottleneck was found to be java monitor code inside SnappyCompressor.
> The methods are neatly inlined by the JIT into the parent caller
> (BlockCompressorStream::write), which unfortunately does not flatten out the
> synchronized blocks.
> !compress-cmpxchg-small.png!
> The loop does a write of small byte[] buffers (each IFile key+value).
> I counted approximately 6 monitor enter/exit blocks per k-v pair written.
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