Am 16.01.2006 um 20:12 schrieb Gary Blomquist:
I would like to be able to use round robin loading balancing with a
JDBCStore. However, it appears that using the PersistentManager with
JDBC store could cause the sessions to be stale when a session
migrates
between workers due to the asyncronous behavior of the
PersistentManager. (I realize their is a SimpleTcpCluster
available as
a clusterering solution but I can not use because it relies on
multicast.)
Wrote you own Membership tcp based service and use the real cluster
implementation :-)
At my feeling the old PersistentManager is only a deprecated prototyp
and not a real cluster solution.
Viewing the source it appears that the PersistentValve with the
PersistentManager and JDBCStore could be a solution. It appears
that
it would load a session from the store at the begging of each request
and save it back to the store at the end of the request. I would like
to modify the behavior to only load/save when the session is dirty
based
on the last_access timestamps.
Any comments on the solution? ( I realize their is some performance
penalty due to object serialization and writing blobs to the database;
however, in our case I think this would not be prohibitive esp. if
there
is a small amount of data in the session.)
Also, when I attempt to run Tomcat with the PersistentValve I get the
following exception:
SEVERE: An exception or error occurred in the container during the
request processing
java.lang.ClassCastException: org.apache.catalina.core.StandardEngine
at
org.apache.catalina.valves.PersistentValve.invoke
(PersistentValve.java:9
9)
at
org.apache.catalina.connector.CoyoteAdapter.service
(CoyoteAdapter.java:1
48)
at
org.apache.jk.server.JkCoyoteHandler.invoke(JkCoyoteHandler.java:199)
at
org.apache.jk.common.HandlerRequest.invoke(HandlerRequest.java:282)
at
org.apache.jk.common.ChannelSocket.invoke(ChannelSocket.java:744)
at
org.apache.jk.common.ChannelSocket.processConnection
(ChannelSocket.java:
674)
at
org.apache.jk.common.ChannelSocket$SocketConnection.runIt
(ChannelSocket.
java:866)
at
org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run
(ThreadPool
.java:684)
at java.lang.Thread.run(Thread.java:595)
Note: (I have not yet made mods to the PersistentValue)
Thanks for your assistance,
Gary Blomquist
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