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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. -- This message is automatically generated by JIRA. - You can reply to this email to add a comment to the issue online.