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https://issues.apache.org/jira/browse/ZOOKEEPER-486?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12790266#action_12790266
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Hadoop QA commented on ZOOKEEPER-486:
-------------------------------------
+1 overall. Here are the results of testing the latest attachment
http://issues.apache.org/jira/secure/attachment/12427942/ZOOKEEPER-486.patch
against trunk revision 889848.
+1 @author. The patch does not contain any @author tags.
+1 tests included. The patch appears to include 6 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-h8.grid.sp2.yahoo.net/87/testReport/
Findbugs warnings:
http://hudson.zones.apache.org/hudson/job/Zookeeper-Patch-h8.grid.sp2.yahoo.net/87/artifact/trunk/build/test/findbugs/newPatchFindbugsWarnings.html
Console output:
http://hudson.zones.apache.org/hudson/job/Zookeeper-Patch-h8.grid.sp2.yahoo.net/87/console
This message is automatically generated.
> Improve bookie performance for large number of ledgers
> ------------------------------------------------------
>
> Key: ZOOKEEPER-486
> URL: https://issues.apache.org/jira/browse/ZOOKEEPER-486
> Project: Zookeeper
> Issue Type: Improvement
> Components: contrib-bookkeeper
> Reporter: Flavio Paiva Junqueira
> Assignee: Benjamin Reed
> Attachments: ZOOKEEPER-486.patch, ZOOKEEPER-486.patch
>
>
> If we write simultaneously to a large number of ledgers on a bookie, then
> performance drops significantly due to more seeks on the ledger device. In
> such cases, we should be clustering ledgers into files to reduce the number
> of seeks, and performing sequential writes on each file. Clustering ledgers
> will impact read performance, so we would to have a knob to control such a
> feature.
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