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From Christian Posta <christian.po...@gmail.com>
Subject Re: Query about ActiveMQ connection id and client id format
Date Fri, 27 Sep 2013 14:31:00 GMT
On Wed, Sep 25, 2013 at 11:35 PM, Steven Turner
<steventurner808@gmail.com>wrote:

> Hi ActiveMQ team,
>
> Could somebody please help me understand the format of ActiveMQ connection
> id and client id. For example, I see this line in broker logs.
>
> 20130926 11:52:52:284 IST (ActiveMQ Transport:
> tcp:///10.240.170.64:40739@61616)
> org.apache.activemq.broker.util.LoggingBrokerPlugin 188 INFO - Adding
> Connection : ConnectionInfo {commandId = 1, responseRequired = true,
> connectionId = ID:desh0041.hyd-32812-1380176571908-1:1, clientId =
> ID:desh0041.hyd-32812-1380176571908-0:1, clientIp =
> tcp://10.240.170.64:40739, userName = test, password = *****, brokerPath =
> null, brokerMasterConnector = false, manageable = true, clientMaster =
> true,
> faultTolerant = true, failoverReconnect = false}.
>
> I would like to understand what are the different attributes in connection
> id and client id here apart from the client's host name. For example, 32812
> here is neither client's port nor its process id. What does it represent?
>
It's a randomly generated number. It's gathered by picking a random port.


> What does 1380176571908 represent here?
>
It's the time in milliseconds on the system that started using ActiveMQ's
ID Generator


>  Why are they not same here?

Because two different id generators are used. They have two different
meanings.


> connectionId = ID:desh0041.hyd-32812-1380176571908-1:1
> clientId = ID:desh0041.hyd-32812-1380176571908-0:1
>
> Please also help me understand the following:
> 1. Is connection id and client id guaranteed to be unique for every client
> (producer or consumer) in every run? Can I assume that at no times two
> connection ids/client ids will be same?
>
ConnectionIDs are guaranteed to be unique for every connection. You can
have a multiplicity of  producers/consumers per connection.

ClientIDs aren't necessarily unique across all connections because they can
be set by the client on the ConnectionFactory.


> 2. Are these created on the broker side or created on the client side?
>
Client side for JMS. Server side for STOMP.


> 3. I see some difference in connection id and client id for JMS and STOMP
> clients? For example, the connection id for jms client has client host in
> it
> but connection id for stomp client has broker host in it? Why this
> difference and inconsistency? Please help me understand.
>
Shouldn't be. The code on client for JMS connection:

 connectionIdGenerator = new IdGenerator();

code for stomp connection on server:

private static final IdGenerator CONNECTION_ID_GENERATOR = new
IdGenerator();





>
> Thanks a ton!
>
> -Steven
>
>
>
> --
> View this message in context:
> http://activemq.2283324.n4.nabble.com/Query-about-ActiveMQ-connection-id-and-client-id-format-tp4671843.html
> Sent from the ActiveMQ - User mailing list archive at Nabble.com.
>



-- 
*Christian Posta*
http://www.christianposta.com/blog
twitter: @christianposta

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