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From "Hadoop QA (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-12719) Add test WAL provider to quantify FSHLog overhead in the absence of HDFS.
Date Tue, 30 Dec 2014 22:12:13 GMT

    [ https://issues.apache.org/jira/browse/HBASE-12719?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14261557#comment-14261557
] 

Hadoop QA commented on HBASE-12719:
-----------------------------------

{color:green}+1 overall{color}.  Here are the results of testing the latest attachment 
  http://issues.apache.org/jira/secure/attachment/12689557/HBASE-12719.2.patch.txt
  against master branch at commit 734324e80f44be4d40b1ee4612a838b581d504b2.
  ATTACHMENT ID: 12689557

    {color:green}+1 @author{color}.  The patch does not contain any @author tags.

    {color:green}+1 tests included{color}.  The patch appears to include 3 new or modified
tests.

    {color:green}+1 javac{color}.  The applied patch does not increase the total number of
javac compiler warnings.

    {color:green}+1 javac{color}.  The applied patch does not increase the total number of
javac compiler warnings.

    {color:green}+1 javadoc{color}.  The javadoc tool did not generate any warning messages.

    {color:green}+1 checkstyle{color}.  The applied patch does not increase the total number
of checkstyle 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 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/12266//testReport/
Findbugs warnings: https://builds.apache.org/job/PreCommit-HBASE-Build/12266//artifact/patchprocess/newPatchFindbugsWarningshbase-prefix-tree.html
Findbugs warnings: https://builds.apache.org/job/PreCommit-HBASE-Build/12266//artifact/patchprocess/newPatchFindbugsWarningshbase-examples.html
Findbugs warnings: https://builds.apache.org/job/PreCommit-HBASE-Build/12266//artifact/patchprocess/newPatchFindbugsWarningshbase-common.html
Findbugs warnings: https://builds.apache.org/job/PreCommit-HBASE-Build/12266//artifact/patchprocess/newPatchFindbugsWarningshbase-annotations.html
Findbugs warnings: https://builds.apache.org/job/PreCommit-HBASE-Build/12266//artifact/patchprocess/newPatchFindbugsWarningshbase-hadoop-compat.html
Findbugs warnings: https://builds.apache.org/job/PreCommit-HBASE-Build/12266//artifact/patchprocess/newPatchFindbugsWarningshbase-rest.html
Findbugs warnings: https://builds.apache.org/job/PreCommit-HBASE-Build/12266//artifact/patchprocess/newPatchFindbugsWarningshbase-client.html
Findbugs warnings: https://builds.apache.org/job/PreCommit-HBASE-Build/12266//artifact/patchprocess/newPatchFindbugsWarningshbase-thrift.html
Findbugs warnings: https://builds.apache.org/job/PreCommit-HBASE-Build/12266//artifact/patchprocess/newPatchFindbugsWarningshbase-protocol.html
Findbugs warnings: https://builds.apache.org/job/PreCommit-HBASE-Build/12266//artifact/patchprocess/newPatchFindbugsWarningshbase-server.html
Findbugs warnings: https://builds.apache.org/job/PreCommit-HBASE-Build/12266//artifact/patchprocess/newPatchFindbugsWarningshbase-hadoop2-compat.html
Checkstyle Errors: https://builds.apache.org/job/PreCommit-HBASE-Build/12266//artifact/patchprocess/checkstyle-aggregate.html

  Console output: https://builds.apache.org/job/PreCommit-HBASE-Build/12266//console

This message is automatically generated.

> Add test WAL provider to quantify FSHLog overhead in the absence of HDFS.
> -------------------------------------------------------------------------
>
>                 Key: HBASE-12719
>                 URL: https://issues.apache.org/jira/browse/HBASE-12719
>             Project: HBase
>          Issue Type: Improvement
>          Components: test, wal
>            Reporter: Sean Busbey
>            Assignee: Sean Busbey
>            Priority: Minor
>             Fix For: 2.0.0, 1.1.0
>
>         Attachments: HBASE-12719.1.patch.txt, HBASE-12719.2.patch.txt, HBASE-12719_comparison_chart.tiff
>
>
> Discussion in HBASE-5699 included showing the max throughput for our WAL benchmark (using
the DisabledWALProvider) compared to when we are actually dealing with synchronization and
talking with HDFS.
> What we can't see in that comparison is how much of the (sizable) gap is due to the coordination
done in FSHLog to deal with multi-threading and how much of it is due to talking to HDFS.
> Make a test-only provider that we can use to isolate the cost for HDFS appends, HDFS
flush, and file rolling.



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