what you're seeing is correct.
the server did fail over, and by changing the session id, it ensures
that it does not do "fail back"
Filip
Roy McMorran wrote:
Hello all,
I've built a very simple 2-member Tomcat cluster for testing, but I am
unable to get the session replication quite right. The problem is
when I fail one member of the cluster. The behavior I was expecting
is that the other cluster member would take over the session ids for
the failed member. However it is appending it's own jvmRoute value to
the session id, and thus setting a new cookie.
Details:
I have 2 cluster members, "itchy" and "scratchy", running on the same
physical server, and CATALINA_BASE is /var/tomcat/itchy and
/var/tomcat/scratchy respectively. Tomcat 6.0.18 binaries, etc. are
at /usr/local/tomcat. Using mod_jk 1.2.27 on Apache 2.2.11 (Apache is
also on the same server). I am using sticky sessions.
Here are the access logs for the 2 members from a short "failover"
experiment (note I'm including the session ID in the 2nd field). The
session starts on scratchy. From scratchy_access_log.2009-04-02.txt:
192.168.200.177 E5BF3FFA9AEE1E3AB0DD4A96BA5E4011.scratchy -
[02/Apr/2009:10:19:55 -0400] "GET / HTTP/1.1" 200 14612
192.168.200.177 E5BF3FFA9AEE1E3AB0DD4A96BA5E4011.scratchy -
[02/Apr/2009:10:20:14 -0400] "GET /about/ HTTP/1.1" 200 19507
At 10:21:39 AM I do a kill -9 on the scratchy instance. Now the
traffic goes to the other cluster member as expected. From
itchy_access_log.2009-04-02.txt:
192.168.200.177 E5BF3FFA9AEE1E3AB0DD4A96BA5E4011.itchy -
[02/Apr/2009:10:22:11 -0400] "GET /about/publications/ HTTP/1.1" 200
18263
192.168.200.177 E5BF3FFA9AEE1E3AB0DD4A96BA5E4011.itchy -
[02/Apr/2009:10:22:32 -0400] "GET /about/changes/ HTTP/1.1" 200 12736
Note however that the new member's jvmRoute value is now appended to
the session id. I thought is was supposed to stay exactly the same
after failover.
Additional details can be found as follows:
server.xml for "itchy" - see:
http://gillnet.mdibl.org/~mcmorran/itchy-server.xml.txt
server.xml for "scratchy" - see:
http://gillnet.mdibl.org/~mcmorran/scratchy-server.xml.txt
context.xml (identical) - see:
https://gillnet.mdibl.org/~mcmorran/context.xml.txt
workers.properties:
https://gillnet.mdibl.org/~mcmorran/workers.properties
I've also included the catalina.out file for both, from startup and
through the test at:
https://gillnet.mdibl.org/~mcmorran/itchy-catalina.out
https://gillnet.mdibl.org/~mcmorran/scratchy-catalina.out
I'd appreciate any advice on where I went wrong. Thanks and best wishes,
Roy
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