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From "Hadoop QA (JIRA)" <j...@apache.org>
Subject [jira] Commented: (ZOOKEEPER-831) BookKeeper: Throttling improved for reads
Date Wed, 04 Aug 2010 22:02:15 GMT

    [ https://issues.apache.org/jira/browse/ZOOKEEPER-831?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12895440#action_12895440
] 

Hadoop QA commented on ZOOKEEPER-831:
-------------------------------------

+1 overall.  Here are the results of testing the latest attachment 
  http://issues.apache.org/jira/secure/attachment/12451268/ZOOKEEPER-831.patch
  against trunk revision 980576.

    +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/Zookeeper-Patch-h7.grid.sp2.yahoo.net/107/testReport/
Findbugs warnings: http://hudson.zones.apache.org/hudson/job/Zookeeper-Patch-h7.grid.sp2.yahoo.net/107/artifact/trunk/build/test/findbugs/newPatchFindbugsWarnings.html
Console output: http://hudson.zones.apache.org/hudson/job/Zookeeper-Patch-h7.grid.sp2.yahoo.net/107/console

This message is automatically generated.

> BookKeeper: Throttling improved for reads
> -----------------------------------------
>
>                 Key: ZOOKEEPER-831
>                 URL: https://issues.apache.org/jira/browse/ZOOKEEPER-831
>             Project: Zookeeper
>          Issue Type: Bug
>          Components: contrib-bookkeeper
>    Affects Versions: 3.3.1
>            Reporter: Flavio Junqueira
>            Assignee: Flavio Junqueira
>             Fix For: 3.4.0
>
>         Attachments: ZOOKEEPER-831.patch
>
>
> Reads and writes in BookKeeper are asymmetric: a write request writes one entry, whereas
a read request may read multiple requests. The current implementation of throttling only counts
the number of read requests instead of counting the number of entries being read. Consequently,
a few read requests reading a large number of entries each will spawn a large number of read-entry
requests. 

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