there have been a few articles, check onjava.com for example, asynch will result in a faster response time, but doesn't guarantee that the session gets replicated for the next request.
Filip ----- Original Message ----- From: "Micky Williamson" <[EMAIL PROTECTED]> To: "Tomcat Users List" <tomcat-user@jakarta.apache.org> Sent: Thursday, February 10, 2005 3:43 PM Subject: Re: Tomcat 5 cluster spins out of control periodically hmm.... is there any difference in performance with pooled vs async? The OS is HPUX 11 Filip Hanik - Dev wrote: >ah, you might be having problems with the java.nio package, (TCP) >as the conf below you are mentioning, are using those settings. >asynch doesn't require an ack message, and some VM's on some platforms have >problems sending data back on a NIO channel. >linux had this issue unless you set LD_ASSUME_KERNEL for example, > >Filip > >----- Original Message ----- >From: "Micky Williamson" <[EMAIL PROTECTED]> >To: "Tomcat Users List" <tomcat-user@jakarta.apache.org> >Sent: Thursday, February 10, 2005 2:44 PM >Subject: Re: Tomcat 5 cluster spins out of control periodically > > >Filip, >thanks for the information. >I did notice that on our test servers, it doesn't happen as frequently. >And in the production server.xml we had: > <Sender > >className="org.apache.catalina.cluster.tcp.ReplicationTransmitter" > replicationMode="pooled"/> > >In the test one it was: > > <Sender > >className="org.apache.catalina.cluster.tcp.ReplicationTransmitter" > replicationMode="asynchronous"/> > >What is the better way? > > >Filip Hanik - Dev wrote: > > > >>probably is the multi cast receiver that freaks out. >>This can happen if the network cable is unplugged. I will add in a sleep on >>the receiver so that even in this case it wont freak >>out. >> >>so in the scenario above, its a known problem, checking in a fix right now. >>if you do provide a dump however, we will know more. >>or even better, profiling it. >> >>Filip >> >>----- Original Message ----- >>From: "Micky Williamson" <[EMAIL PROTECTED]> >>To: "Tomcat Users List" <tomcat-user@jakarta.apache.org> >>Sent: Thursday, February 10, 2005 1:24 PM >>Subject: Re: Tomcat 5 cluster spins out of control periodically >> >> >>No, >>not using Apache to front end. >>Haven't done any thread dumps...yet. >> >>I just was throwing feelers out to see if there is any history of this. >> >> >>Tim Funk wrote: >> >> >> >> >> >>>Are you using apache in front of tomcat? >>>Have you done thread dumps when in a good state vs a 100% cpu state? >>>Sounds like an inifinite loop. >>> >>>-Tim >>> >>>Micky Williamson wrote: >>> >>> >>> >>> >>> >>>>I have two machines running Tomcat 5.0 with java 1.4. >>>>Both are clustered together. Every once in a while, one or the other >>>>just starts spinning out of control and clocking wall time. >>>> >>>>This is on hp ux version 11. New machines, lots of resources (16 >>>>Gig of RAM) >>>> >>>> >>>> >>>> >>>--------------------------------------------------------------------- >>>To unsubscribe, e-mail: [EMAIL PROTECTED] >>>For additional commands, e-mail: [EMAIL PROTECTED] >>> >>> >>> >>> >>> >>> >>--------------------------------------------------------------------- >>To unsubscribe, e-mail: [EMAIL PROTECTED] >>For additional commands, e-mail: [EMAIL PROTECTED] >> >> >>--------------------------------------------------------------------- >>To unsubscribe, e-mail: [EMAIL PROTECTED] >>For additional commands, e-mail: [EMAIL PROTECTED] >> >> >> >> >> >> > >--------------------------------------------------------------------- >To unsubscribe, e-mail: [EMAIL PROTECTED] >For additional commands, e-mail: [EMAIL PROTECTED] > >--------------------------------------------------------------------- >To unsubscribe, e-mail: [EMAIL PROTECTED] >For additional commands, e-mail: [EMAIL PROTECTED] > > > > --------------------------------------------------------------------- To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] --------------------------------------------------------------------- To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
