Rick,
On 4/15/24 08:12, Rick Noel wrote:
Hi Chuck,
Your suggestion did not work.
I defined Membership as suggested...
and still getting this in the logs
org.apache.catalina.ha.session.DeltaManager.startInternal Starting clustering
manager at [##0001]
15-Apr-2024 07:55:36.744 INFO [main]
org.apache.catalina.ha.session.DeltaManager.getAllClusterSessions Manager
[##0001]: skipping state transfer. No members active in cluster group
Do you think the transfer is not happening because the application is only on
one machine?
Our Production environment will have our application on two machines but in our dev environment we
have only one machine in the "cluster". So we really do not have a "cluster"
environment.
Again, we would like to know is going on before we introduce clustering in our
live environment.
We are using Java 17 and Tomcat 10
I've never set up replication in Tomcat, so I may be speaking out of turn.
But is it possible that since you have only a single node (right?),
Tomcat is really saying "skipping state transfer. No [other] members
active in cluster group"?
-chris
-Original Message-
From: Chuck Caldarale
Sent: Saturday, April 13, 2024 4:00 PM
To: Tomcat Users List
Subject: [EXT]Re: [EXT]Re: Tomcat 10 session replication fails
On Apr 11, 2024, at 09:07, Rick Noel wrote:
We are getting closer
Changing ports from the 5000 range to the 4000 range stopped two
errors But now I get this..
INFO: Manager [##0001]: skipping state transfer. No members active in
cluster group
How to I make the member machine in the cluster active?
There’s a cluster configuration option that may be coming into play here:
localLoopbackDisabled. Once upon a time, the JDK method:
MulticastSocket.setLoopbackMode(boolean disable) did the opposite of
what one might think from just the method name - passing in true disabled local
receipt of multicast packets. That method has since been deprecated, and Tomcat
currently uses this method:
DatagramSocket.setOption(SocketOption name, T value) which, at
least in Java 21, operates as you might expect from the name - specifying true enables
multicast loopback.
However, there’s some interesting logic in Tomcat's handling of
localLoopbackDisabled that can inverts the config value based on the Java
level, along with this comment:
Java < 14, a value of true means loopback is disabled. Java 14+ a
value of true means loopback is enabled.
Having not dug into the JRE source code for the various Java versions, I’m not yet
convinced the version checking logic is correct. You might try setting
localLoopbackDisabled to true in your config to see if that
has an effect on your dev system.
Also, let us know what Java version you’re using.
- Chuck
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