Distributed Destination and Recieving Messages !

Hi !
          I'm new to JMS.
          I'm configuring a Weblogic Cuslter of 3 nodes with a JMS Server deployed on each node (Can't target a JMS Server to a CLUSTER). We have 4 destinations (Queue) deployed on each JMS Server.
          I'm creating a Distributed Desination with members being the Queues from the three JMS Servers to take advantage of Load Balancing and High Availability nature of DD.
          No my question is, when a message is placed on the Queue (message received from MQ Server through Weblogic Bridge), which one of the three Queue is the message going to go? My guess is it's going to be sent to the Queue based on Round-Robin algorithm.
          Can you please explain me how sending/recieving messages with JMS are going to work in a Weblogic Cluster environment?. We will be using MDBs to receive messages. So, I'm assuming I'm going to need to use the JNDI for the DD in my descriptor. Also for sending, I'm assuming I should use the JNDI for the DD.
          Thanks very much for your help.

If you'll send JMS message to your queue from your server app deployed to
          your cluster then the balancing algorithm will use server-afinity policy (if
          it is not turned off) and message will be delivered to the queue on the same
          server where you emit it.
          Denis.
          <Karun Subramanian> wrote in message news:[email protected]..
          > Hi !
          > I'm new to JMS.
          >
          > I'm configuring a Weblogic Cuslter of 3 nodes with a JMS Server deployed
          > on each node (Can't target a JMS Server to a CLUSTER). We have 4
          > destinations (Queue) deployed on each JMS Server.
          >
          > I'm creating a Distributed Desination with members being the Queues from
          > the three JMS Servers to take advantage of Load Balancing and High
          > Availability nature of DD.
          >
          >
          > No my question is, when a message is placed on the Queue (message received
          > from MQ Server through Weblogic Bridge), which one of the three Queue is
          > the message going to go? My guess is it's going to be sent to the Queue
          > based on Round-Robin algorithm.
          >
          > Can you please explain me how sending/recieving messages with JMS are
          > going to work in a Weblogic Cluster environment?. We will be using MDBs
          > to receive messages. So, I'm assuming I'm going to need to use the JNDI
          > for the DD in my descriptor. Also for sending, I'm assuming I should use
          > the JNDI for the DD.
          >
          > Thanks very much for your help.

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We have two clusters; each consisting of two managed servers. Can I create a single distributed JMS destination for BOTH clusters? If yes, how? If no, what is the best alternative so that I do not have to change the application for JMSqueue name?
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Distributed Destinations and Error Queues

          I have a distributed queue - distqueue which is configured with two queue members
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          and srvr2q. srvr1q is a physical queue destination that is running on JMSServer1
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          "Prakash Muthukrishnan" <[email protected]> wrote:
          >
          >Hi Tom
          > Thanks again for the reply. I do use a tx MDB. I have set the transaction-type
          >to Container in the message-driven stanza in ejb-jar.xml. And also the
          >trans-attribute
          >for that EJB in the container-transaction stanza, I have used Required.
          >Do I need
          >to setup anything else ?
          I don't think so.
          > The transaction descriptor element in the weblogic-enterprise-bean
          >stanza in weblogic-ejb-jar.xml for that MDB is empty.
          Not sure what you mean?
          > Am I missing anything
          >else?
          Container & Required is all that is needed
          If you like, post your ejb descriptor xml file, and I'll take a quick
          look to double-check.
          >-Prakash
          >
          >Tom Barnes <[email protected]> wrote:
          >>Hi Prakash,
          >>
          >>A runtime exception should force a rollback for tx MDBs, and
          >>a recover for non-tx MDBs. If you are seeing different
          >>behavior there may be a bug in WL.
          >>
          >>Since MDBs do not log an exception when the app throws
          >>a Runtime exception, I often recommend wrapping the
          >>application code in a try catch anyhow
          >> try {
          >> } catch (Throwable t) {
          >> log
          >> force rollback
          >> }
          >>I think there are plans to provide a configurable that
          >>optionally does something similar in the next release (no guarantees).
          >>(The problem is that some apps throw a runtime on purpose, and
          >>could quickly flood the log if such runtimes were logged per message.)
          >>
          >>Tom
          >>
          >>Prakash Muthukrishnan wrote:
          >>> Tom
          >>> Thanks for the suggestion. Using the setRollbackOnly method did the
          >>trick. This
          >>> brings up
          >>> a related question: What if a run time exception was thrown during
          >>the processing
          >>> in an MDB?
          >>> Is it not retried and ultimately shoved into the error queue?
          >>> Thanks again.
          >>> -Prakash
          >>>
          >>>
          >>> Tom Barnes <[email protected]> wrote:
          >>>
          >>>>Hi Prakash,
          >>>>
          >>>>At first glance, it doesn't seem like your doing anything wrong.
          >>>>Could you post your release and SP level, as well as your config.xml?
          >>>>
          >>>>How many messages did you send through?
          >>>>
          >>>>Note that for transactional MDBs it is best to call "setRollbackOnly"
          >>>>on the EJB context rather than throwing an NPE. This is because
          >>>>throwing a runtime exception forces the MDB to destroy itself and
          >>>>get re-initialized (pretty high overhead). For non-transactional
          >>>>MDBs, throwing a runtime exception is your only option.
          >>>>
          >>>>Tom, BEA
          >>>>
          >>>>Prakash Muthukrishnan wrote:
          >>>>
          >>>>
          >>>>>I have a distributed queue - distqueue which is configured with two
          >>>>
          >>>>queue members
          >>>>
          >>>>>- srvr1q
          >>>>>and srvr2q. srvr1q is a physical queue destination that is running
          >>>>
          >>>>on JMSServer1
          >>>>
          >>>>>on one instance in a cluster. srvr2q is a physical queue destination
          >>>>
          >>>>that is running
          >>>>
          >>>>>on JMSServer2 on another instance in the cluster. I have two errorqueues
          >>>>
          >>>>- srvr1errq
          >>>>
          >>>>>and srvr2errq - deployed on JMSServer1 and JMSServer2 respectively.
          >>>>
          >>>>I have configured
          >>>>
          >>>>>the srvr1q to the following:
          >>>>>
          >>>>>Redelivery Delay Override: 10000
          >>>>>Redelivery Limit: 3
          >>>>>Error Destination: srvr1errq
          >>>>>
          >>>>>Also the srvr2q is configured to the following:
          >>>>>Redelivery Delay Override: 10000
          >>>>>Redelivery Limit: 3
          >>>>>Error Destination: srvr2errq
          >>>>>
          >>>>>There is an MDB listening to each one of these local queues. The
          >MDB
          >>>>
          >>>>is programmed
          >>>>
          >>>>>to throw a null pointer exception (to simulate business logic processing
          >>>>
          >>>>failures)
          >>>>
          >>>>>My expectations are : the message goes to one of the local queues.
          >>>>
          >>>>Null Pointer
          >>>>
          >>>>>exception is thrown. After 10 seconds the message is resent to the
          >>>>
          >>>>same queue
          >>>>
          >>>>>with a similar fate. After the third attempt, the message is moved
          >>>>
          >>>>to the error
          >>>>
          >>>>>queue of the corresponding local queue.
          >>>>>
          >>>>>What I see is the following:
          >>>>>When I send a message I do see a Null Pointer Exception, but it occurs
          >>>>
          >>>>only once
          >>>>
          >>>>>and I dont see the message going to the error queue. Since my Load
          >>>>
          >>>>Balancing policy
          >>>>
          >>>>>is Round-Robin on the distqueue, the local queues receive the message
          >>>>
          >>>>every other
          >>>>
          >>>>>time with the same result - Null Pointer Exception thrown only once.
          >>>>>
          >>>>>I also have JMSStores configured so the messages are persistent.
          >>>>>
          >>>>>Can someone explain to me what I am doing wrong?
          >>>>>Thanks.
          >>>>
          >>>
          >>
          >

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Hi moha_affa,
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sameerdaga wrote:
Except 8, 10, 11, 12, 13, 14 and 20, which issues relate to WhatsApp. Also to put phone to flight mode is not the solution to problem of auto switching on of phone while charging. Kindly resolve other issues and forward the issue related to WhatsApp to WhatsApp technical team.
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Hi moha_affa,
To be polite, this isn't a great place for your question. If you're using PC side control, or some other way that NI products are involved in your project, you'd have a better chance at success here. The NI forums likely have a few members with uC experience, but it's far from the focus.
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I'm having some problems using Distributed Destinations with the Messaging Bridge in WLS 7.0sp2. Our configuration consists of the following:
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Hi Rob,
          Consumers on distributed destinations are always pinned
          to a single physical destination on creation. Only
          producers can round-robin each message. When a
          distributed destination is used as a source destination,
          you will need to configure a bridge per distributed
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          Tom
          Rob McArthur wrote:
          > I'm having some problems using Distributed Destinations with the Messaging Bridge in WLS 7.0sp2. Our configuration consists of the following:
          > * WLS Server1:
          > * JMS Server1:
          > * inbound queue
          > * outbound queue
          > * JMS Server2:
          > * inbound queue
          > * outbound queue
          > * WLS Server 2:
          > * JMS Server3:
          > * inbound queue
          > * outbound queue
          >
          > A distributed destination is configured for the inbound and outbound queues.
          >
          > Two messaging queues are configured so that bridge from WLS JMS to Tibco JMS using the distributed destinations.
          >
          > Everything is working fine for the inbound, but we have found that the outbound messaging bridge is picking up messages from only one of the two JMS servers on the first WLS instance. When monitoring, it can be seen that there is no consumer registered against the second JMS server.
          >
          > Any suggestions?
          >
          >

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I'm using distributed JMS destination (Cluster) of Web Logic server 8.1.
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Are your consumers co-located with each managed server or remote?
Let me preface this by this is the way I believe it works...
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QueueReceivers
http://edocs.bea.com/wls/docs103/jms/dds.html
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Note: For information on the load-balancing heuristics for distributed queues with zero consumers, see “Configuring Distributed Destination Resources”.
http://edocs.bea.com/wls/docs103/jms_admin/advance_config.html#jms_distributed_destination_config
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Distributed Destination and Recieving Messages !

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