tomcat 6 - Cluster / BackupManager

Posted by Kevin on Stack Overflow See other posts from Stack Overflow or by Kevin
Published on 2010-05-27T22:02:16Z Indexed on 2010/05/28 11:41 UTC
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session

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tomcat

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cluster

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failover

Hi,

I have a question regarding Clustering (session replication/failover) in tomcat 6 using BackupManager. Reason I chose BackupManager, is because it replicates the session to only one other server.

I am going to run through the example below to try and explain my question.

I have 6 nodes setup in a tomcat 6 cluster with BackupManager. The front end is one Apache server using mod_jk with sticky session enabled
Each node has 1 session each. node1 has a session from client1 node2 has a session from client2 .. ..
Now lets say node1 goes down ; assuming node2 is the backup, node2 now has two sessions (for client2 and client1)
The next time client1 makes a request, what exactly happens ? Does Apache "know" that node1 is down and does it send the request directly to node2 ?

=OR=

does it try each of the 6 instances and find out the hard way who the backup is ?

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