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answered 2012-01-17 22:18:09 +0800

terrytornado gravatar image terrytornado flag of Germany

Hope i'm right and anybody can correct me. In easy words is a comet (it's only the name for it) server push a mechansim to asynchron DELAY a http answer. Means that it looks like the server is calling the client. But in fact the client initiate the process and the server gives at first answer if some defined action is gone (i,e, changes in share prices at Wall Street.)

Suppose we have a clustered application runs in an environment with 5 Tomcat workers and 1 Apache load balancer in front. I don't know what happened with the performance if the zk session object is shared over all tomcats (zk is AJAX, so it makes heavy requests). So i would prefer an extra server for cluster wide eventQueues. But such a question is better answered by the zk core developers. I'm interested in this too.

best Stephan

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