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| Number of TCP/IP connections in a JMS Topic session |
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| sieijish |
 Posted: Wed Sep 16, 2009 2:36 am Post subject: Number of TCP/IP connections in a JMS Topic session |
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Acolyte
Joined: 29 Nov 2004
Posts: 67
Location: London
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I am wondering how many TCP/IP connections are opened between an MQ Java client & the Server. The connection is established using a server connection channel.
TopicConnection tConn = tcf.createTopicConnection();
- After this line I see 2 Tcp/IP connections using netstat command
- In the MQ Explorer svr connection status window only one connection exists
Question: why is MQ using 2 TCP/IP connections?
TopicSession tSess = tConn.createTopicSession(false, Session.AUTO_ACKNOWLEDGE);
Topic topic = tSess.createTopic("LCUnit/sieijish");
Now after creating the topic,
- I see 6 TCP/IP connections
- 3 connections listed in the channel status window.
Question: Why is this overhead for creating Topic? Can this be reduced?
Now to clean up the connections, I do
tSess.close();
Note: This has absolutely no impact. All 6 tcp/ip connections are still open
tConn.close();
This closes all the connections.
I am doing a proof of concept to see whether it is possible to have around 4000 simultaneously active clients connecting to MQ Server with each client publishing messages to a number of topics on the server. Each client will be sending about say 1msg per sec. I am concerned about the number of TCP/IP connections opened and closed and the best way to manage these connections. With 6 connections to publish to a topic, i am looking at 6*4000 tcp/ip parallel connections!!
Yes, we need a cluster of server with clients possibly doing a round-robin, but to start with I need somehow find out how much each server can cope and the efficient behaviour of the clients. May be connect, disconnect or stay connected...
Let me know your thoughts. |
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| terlisimo |
| Posted: Tue Dec 01, 2009 3:43 pm Post subject: |
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Newbie
Joined: 09 Nov 2009
Posts: 8
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| you could do connectionFactory.setUseConnectionPooling(true); |
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| manicminer |
| Posted: Wed Dec 02, 2009 5:17 am Post subject: |
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Disciple
Joined: 11 Jul 2007
Posts: 177
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Make sure you use V7 client and server. This has optimisations both in terms of pub/sub and the use of connections back to the server.
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Give a man a fish and you feed him for a day. Teach a man to fish and you feed him for a lifetime. |
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| fjb_saper |
| Posted: Wed Dec 02, 2009 9:56 pm Post subject: |
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Grand High Poobah
Joined: 18 Nov 2003
Posts: 20756
Location: LI,NY
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Back to your question:
How do you determine that there is 2 connections opened in TCP/IP when the connection is created?
Anyways the count to the max connections on the channel is what MQ reports in the channel status not what the OS says... 
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