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From llow...@oreillyauto.com
Subject Tuning session replication on clusters
Date Wed, 05 Sep 2012 19:51:01 GMT

I have a small cluster of 3 nodes running tomcat 6.0.24 with openJDK
1.6.0_20 on Ubuntu 10.04 LTS.

I have roughly 5,000-6,000 sessions at any given time, and when I restart
one of the nodes I am finding that not all sessions are getting
replicated , even when I have the state transfer  timeout set to 60
seconds.

It seems that only sessions that have been touched recently are replicated,
even if the session is still otherwise valid. I did one test where I
created about 1,500 sessions and then took out one node, When I brought it
back online, it only replicated the 4-5 sessions that were from active
users on the test cluster. It did not replicated the idle sessions that
were still valid that my prior test had created.

I  am wanting to tune my settings, but I am unsure where would be the best
place to start. Should I start with the threads available to the NIO
Receiver, or would I be better off focusing on a different set of
attributes first, such as the send or receive timeout values?

Any tips or pointers as to which setting might be the most productive would
be greatly appreciated.

Lee Lowder
O'Reilly Auto Parts
Web Systems Administrator
(417) 862-2674 x1858

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