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From "Hadoop QA (JIRA)" <j...@apache.org>
Subject [jira] Commented: (ZOOKEEPER-336) single bad client can cause server to stop accepting connections
Date Wed, 03 Jun 2009 22:54:07 GMT

    [ https://issues.apache.org/jira/browse/ZOOKEEPER-336?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12716095#action_12716095
] 

Hadoop QA commented on ZOOKEEPER-336:
-------------------------------------

+1 overall.  Here are the results of testing the latest attachment 
  http://issues.apache.org/jira/secure/attachment/12409788/ZOOKEEPER-336.patch
  against trunk revision 781266.

    +1 @author.  The patch does not contain any @author tags.

    +1 tests included.  The patch appears to include 23 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-vesta.apache.org/102/testReport/
Findbugs warnings: http://hudson.zones.apache.org/hudson/job/Zookeeper-Patch-vesta.apache.org/102/artifact/trunk/build/test/findbugs/newPatchFindbugsWarnings.html
Console output: http://hudson.zones.apache.org/hudson/job/Zookeeper-Patch-vesta.apache.org/102/console

This message is automatically generated.

> single bad client can cause server to stop accepting connections
> ----------------------------------------------------------------
>
>                 Key: ZOOKEEPER-336
>                 URL: https://issues.apache.org/jira/browse/ZOOKEEPER-336
>             Project: Zookeeper
>          Issue Type: Improvement
>          Components: c client, java client, server
>            Reporter: Patrick Hunt
>            Assignee: Henry Robinson
>            Priority: Critical
>             Fix For: 3.2.0
>
>         Attachments: ZOOKEEPER-336.patch, ZOOKEEPER-336.patch, ZOOKEEPER-336.patch, ZOOKEEPER-336.patch,
ZOOKEEPER-336.patch
>
>
> One user saw a case where a single mis-programmed client was overloading the server with
connections - the client was creating a huge number of sessions to the server. This caused
all of the fds on the  server to become used.
> Seems like we should have some way of limiting (configurable override) the maximum number
of sessions from a single client (say 10 by default?) Also we should output warnings when
this limit is exceeded (or attempt to exceed).

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