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https://issues.apache.org/jira/browse/BOOKKEEPER-461?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13508581#comment-13508581
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Hadoop QA commented on BOOKKEEPER-461:
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Testing JIRA BOOKKEEPER-461
WARNING: Running test-patch on a dirty local svn workspace
Patch <a
href="/jira/secure/attachment/12555718/BOOKKEEPER-461.patch">/jira/secure/attachment/12555718/BOOKKEEPER-461.patch</a>
downloaded at Mon Dec 3 08:15:50 UTC 2012
----------------------------
{color:green}+1 PATCH_APPLIES{color}
{color:green}+1 CLEAN{color}
{color:red}-1 RAW_PATCH_ANALYSIS{color}
. {color:green}+1{color} the patch does not introduce any @author tags
. {color:green}+1{color} the patch does not introduce any tabs
. {color:red}-1{color} the patch contains 3 line(s) with trailing spaces
. {color:red}-1{color} the patch contains 2 line(s) longer than 120
characters
. {color:green}+1{color} the patch does adds/modifies 1 testcase(s)
{color:green}+1 RAT{color}
. {color:green}+1{color} the patch does not seem to introduce new RAT
warnings
{color:green}+1 JAVADOC{color}
. {color:green}+1{color} the patch does not seem to introduce new Javadoc
warnings
{color:green}+1 COMPILE{color}
. {color:green}+1{color} HEAD compiles
. {color:green}+1{color} patch compiles
. {color:green}+1{color} the patch does not seem to introduce new javac
warnings
{color:green}+1 FINDBUGS{color}
. {color:green}+1{color} the patch does not seem to introduce new Findbugs
warnings
{color:green}+1 TESTS{color}
. Tests run: 386
{color:green}+1 DISTRO{color}
. {color:green}+1{color} distro tarball builds with the patch
----------------------------
{color:red}*-1 Overall result, please check the reported -1(s)*{color}
The full output of the test-patch run is available at
. https://builds.apache.org/job/bookkeeper-trunk-precommit-build/62/
> Delivery throughput degrades when there are lots of publishers w/ high
> traffic.
> -------------------------------------------------------------------------------
>
> Key: BOOKKEEPER-461
> URL: https://issues.apache.org/jira/browse/BOOKKEEPER-461
> Project: Bookkeeper
> Issue Type: Bug
> Reporter: Sijie Guo
> Assignee: Sijie Guo
> Fix For: 4.2.0
>
> Attachments: BOOKKEEPER-461.diff, BOOKKEEPER-461.diff,
> BOOKKEEPER-461.diff, BOOKKEEPER-461.patch, pub_sub_multithreads.png,
> pub_sub_singlethread.png
>
>
> When running benchmarking over the hub server, found that delivery throughput
> degrades when there are lots of publishers publishing messages. And the
> delivery throughput will goes up when there is no publishes.
> This issue is introduced due to ReadAheadCache only runs a single thread. So
> when the netty workers are busy handling publish requests, they are pushing
> lots of messages into ReadAheadCache's queue to put them in to read ahead
> cache. So the readahead cache is busy on updating keys.
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