Im trying to develop a network application using JMS. Im using the GlassFish application server. Its a queue based point to point application. The message producer sends messages to the queue and two message consumers de-queue the queue and consume the message. There is automatic load balancing between the two clients.
Now the problem arises when i put the two clients on two separate remote machines. The producer sends messages to the queue, on the basis of the address list property set in the admin console of glassfish, jms selects one of the two clients and sends the message to that client. And hence all messages keep going only to that particular client. Load balancing does not happen.
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Can we set this property using the Admin console of glassfish ? Im a beginner in this and have set all the properties using the admin console of glassfish. The ConnectionFactory has an addressList property, in which i have mentioned the names of the remote machines. I do not understand how to set properties using the command line. Im developing this using the Netbeans IDE, with in built glassfish application server.
I checked the Adminstrator manual for this. It looks like Sun only supports one option through the admin console at the moment: maxNumActiveConsumers.
For using the command line, I already gave you the complete command to do it. You'll have to open a command prompt and go to your imq installation dir:
cd \Sun\AppServer\imq\bin
on my system. From there you can execute the commands.
I tried running the command but get the following error, have chacked the username and password using the admin console, but the error persists.
C:\Program Files\glassfish-v2ur2\imq\
Username: admin
Password:
Querying the destination where:
--------------------------
Destination Name Destination Type
--------------------------
jms/Queue Queue
On the broker specified by:
-------------------------
Host Primary Port
-------------------------
localhost 7676
Error while connecting to the broker on host 'localhost' and port '7676'.
com.sun.messaging.jms.JMSS
broker=localhost:7676(4634
Please check your username and/or password.
Querying the destination failed.
Let me explain to you my complete process.I think there may be a problem at the Root.
1. Made a JupiterConnectionFactory on Machine 1. In the addresslist property, added the names of two remote machines
2. made a Queue and gave a physical name PhysicalQueue to it
3. build and Compiled producer.java program on machine 1 using Netbeans
4.Installed glassfish and netbeans on Machine 2
5. Made a JupiterConnectionFactory from the admin console on Machine 2.
6. Made a Queue from the admin console and gave a physical name PhysicalQueue to it.
7. build and complied consumer1.java on machine 2 using netbeans
8.Installed glassfish and netbeans on Machine 3
9. Made a JupiterConnectionFactory from the admin console on Machine 3.
10. Made a Queue from the admin console and gave a physical name PhysicalQueue to it.
11. build and complied consumer2.java on machine 3
12. Ran producer.java on machine 1
13. Ran consumer1.java on machine2
14. Ran consumer2.java on machine3
You can run each glassfish using the same broker. Configure the broker as REMOTE and enter the correct JMS Host. Do this for at least two instances. One instance, the one you start first can have a LOCAL broker. That way it will get started together with glassfish. If you configure it as remote it will never start the broker. It will simply try to connect and fail if it does not succeed.
If you get it running that way, load balancing should occur correct.
I created a Local broker on the producer machine. Then on both the consumer machines, configured the broker as REMOTE and provided the host as the Producer machine, by specifying its IP address and port. But when i try to PING from the consumer machine, it says "Error Occured <Producer machine> ".
When i PING from the Command prompt, there are no issues, i get the reply.
Okay. It works now !!! Load Balancing is also quite accurate. Did not give any AddressList property of the host.So, now it shows two active consumers on the queue.
The Only problem now is that it takes about 2 mins to create the connection from the remote client two the host. It Keeps giving exception: "Connection refused", But starts working after approx 2 mins. Also after the message is received, it again sometimes gives that exception, when the queue gets empty. The client is programmed to continuously listen to the message producer, until manually stopped.
It's strange that it takes so long to connect. On our production machines, where we have a single broker serving 2 glassfish servers on different machines, both servers connect almost immediately to the IMQ broker. So, you probably have a wrong setting somewhere.
If you like me to take a closer look, you can post the domain.xml files of all glassfish instances here.
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by: Bart_CrPosted on 2008-08-24 at 22:36:04ID: 22303405
You'll have to take a look at the "Consumer Flow Limit" property of your queue. In load-balanced queue delivery, this is the initial number of queued messages routed to active consumers before load balancing begins. By default this is set to 1000.
imqcmd -u admin query dst -t q -n <your-queue>
You've got some options to alter this. A destination consumer can override this limit by specifying a lower value on a connection. Or you can set a default per queue or even for all queues. Easiest is to set it per queue.
imqcmd -u admin update dst -t q -n <your-queue> -o consumerFlowLimit=1
For switching consumers every single message. Note that in production system a value of 1 is probably not the best choice. Switching consumers every time will cause a performance overhead.