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From Konstantin Kolinko <knst.koli...@gmail.com>
Subject Re: getAllClusterSessions gives OptionalDataException
Date Tue, 28 Jun 2011 08:31:34 GMT
2011/6/23 Ronald Klop <ronald-mailinglist@base.nl>:
> Hi,
>
> I have an exception when one on my Tomcat nodes restarts. The session are
> not synced and user complain about being logged out. I was running 6.0.32
> and had the problem. Now I'm running a custom build of 6.0.33 from
> yesterday. I added a little code which prints ' SEVERE: name=user'. The key
> on which the sync fails while reading the value.
>
> I looked into the java code in ObjectInputStream and it looks like some
> inconsistency in the ObjectStream.
>
> I have 4 nodes on Debian 5, sun-java6-jdk 6-22-0lenny1, seen the problem on
> Tomcat 6.0.29, 6.0.32 and a custom build 6.0.33. I can't reproduce this
> (yet) on my test environment, so debugging it is difficult without upset
> customers.
>
>    <Engine name="Catalina" defaultHost="xxx.xxx.xxx">
>      <Realm className="org.apache.catalina.realm.UserDatabaseRealm"
>             resourceName="UserDatabase" />
>                <Cluster
> className="org.apache.catalina.ha.tcp.SimpleTcpCluster">
>                        <Channel
> className="org.apache.catalina.tribes.group.GroupChannel">
>                                <Membership
> className="org.apache.catalina.tribes.membership.McastService" port="47727"
> />
>                        </Channel>
>                </Cluster>
>        <Host name="xxx.xxx.xxx"
>                appBase="/data/webapps/crm-LIVE/deployed"
>                unpackWARs="true" autoDeploy="false"
>                xmlValidation="false" xmlNamespaceAware="true">
>        </Host>
>    </Engine>
>
> Can I provide more information? Where should I look.
>
> NB: In some previous mails about another problem I thought that might be the
> reason for my logout problem, that is why I tried 6.0.33-dev.
>
> Ronald.
>
> Jun 23, 2011 5:49:47 PM org.apache.catalina.ha.session.DeltaManager
> getAllClusterSessions
> WARNING: Manager [crm.realworks.nl#], requesting session state from
> org.apache.catalina.tribes.membership.MemberImpl[tcp://{10, 0, 10,
> 110}:4000,{10, 0, 10, 110},4000, alive=45370885,id={-34 112 102 -93 -87 -88
> 77 18 -113 -30 62 8 62 -65 -112 -13 }, payload={}, command={}, domain={}, ].
> This operation will timeout if no session state has been received within 60
> seconds.
> Jun 23, 2011 5:49:47 PM org.apache.catalina.ha.session.DeltaManager
> waitForSendAllSessions
> INFO: Manager [crm.realworks.nl#]; session state send at 6/23/11 5:49 PM
> received in 304 ms.
> Jun 23, 2011 5:49:47 PM org.apache.catalina.ha.session.DeltaManager
> getAllClusterSessions
> WARNING: Manager [crm.realworks.nl#]: Drop message SESSION-ACCESSED inside
> GET_ALL_SESSIONS sync phase start date 6/23/11 5:49 PM message date 6/23/11
> 5:49 PM
> Jun 23, 2011 5:49:47 PM org.apache.catalina.ha.session.DeltaSession
> readObject
> SEVERE: name=user.
> Jun 23, 2011 5:49:47 PM org.apache.catalina.ha.session.DeltaManager
> deserializeSessions
> SEVERE: IOException while loading persisted sessions:
> java.io.OptionalDataException
> java.io.OptionalDataException
>    at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1348)
>    at java.io.ObjectInputStream.readObject(ObjectInputStream.java:350)
>    at java.util.HashMap.readObject(HashMap.java:1029)
(...)

Looking at ObjectInputStream sourced, the OptionalDataException is
thrown when the source stream is truncated.

It might be related to the following issue, fixed in Tomcat 7, but
never proposed for backport yet:
https://issues.apache.org/bugzilla/show_bug.cgi?id=50646
"Tribes ByteMessage will get corrupted if message size exceeds the
underlying buffer size"

Best regards,
Konstantin Kolinko

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