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https://issues.apache.org/jira/browse/HBASE-14540?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14983720#comment-14983720
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Hadoop QA commented on HBASE-14540:
-----------------------------------
{color:red}-1 overall{color}. Here are the results of testing the latest
attachment
http://issues.apache.org/jira/secure/attachment/12769858/14540.txt
against master branch at commit c6d3dcdea33efa4fa745b323f6ff46b8b0711309.
ATTACHMENT ID: 12769858
{color:green}+1 @author{color}. The patch does not contain any @author
tags.
{color:red}-1 tests included{color}. The patch doesn't appear to include
any new or modified tests.
Please justify why no new tests are needed for this
patch.
Also please list what manual steps were performed to
verify this patch.
{color:green}+1 hadoop versions{color}. The patch compiles with all
supported hadoop versions (2.4.0 2.4.1 2.5.0 2.5.1 2.5.2 2.6.0 2.6.1 2.7.0
2.7.1)
{color:green}+1 javac{color}. The applied patch does not increase the
total number of javac compiler warnings.
{color:green}+1 protoc{color}. The applied patch does not increase the
total number of protoc compiler warnings.
{color:green}+1 javadoc{color}. The javadoc tool did not generate any
warning messages.
{color:red}-1 checkstyle{color}. The applied patch generated
1731 checkstyle errors (more than the master's current 1730 errors).
{color:green}+1 findbugs{color}. The patch does not introduce any new
Findbugs (version 2.0.3) warnings.
{color:green}+1 release audit{color}. The applied patch does not increase
the total number of release audit warnings.
{color:green}+1 lineLengths{color}. The patch does not introduce lines
longer than 100
{color:green}+1 site{color}. The mvn post-site goal succeeds with this patch.
{color:green}+1 core tests{color}. The patch passed unit tests in .
Test results:
https://builds.apache.org/job/PreCommit-HBASE-Build/16322//testReport/
Release Findbugs (version 2.0.3) warnings:
https://builds.apache.org/job/PreCommit-HBASE-Build/16322//artifact/patchprocess/newFindbugsWarnings.html
Checkstyle Errors:
https://builds.apache.org/job/PreCommit-HBASE-Build/16322//artifact/patchprocess/checkstyle-aggregate.html
Console output:
https://builds.apache.org/job/PreCommit-HBASE-Build/16322//console
This message is automatically generated.
> Write Ahead Log Batching Optimization
> -------------------------------------
>
> Key: HBASE-14540
> URL: https://issues.apache.org/jira/browse/HBASE-14540
> Project: HBase
> Issue Type: Improvement
> Reporter: John Leach
> Assignee: John Leach
> Attachments: 14540.txt, HBaseWALBlockingWaitStrategy.java, writes.png
>
>
> The new write ahead log mechanism seems to batch too few mutations when
> running inside the disruptor. As we scaled our load up (many threads with
> small writes), we saw the number of hdfs sync operations grow in concert with
> the number of writes. Generally, one would expect the size of the batches to
> grow but the number of actual sync operations to settle.
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