Am 17.04.2015 um 07:45 schrieb Christopher Schultz:
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Chris,
On 4/16/15 9:59 AM, Christoph Prybila wrote:
Tomcat: 7.0.59 OS: Win7 Professional SP1 Java:
1.7.0_67
I want to create a cluster and I need to use static membership. But
the number of nodes in my cluster is not static.
Is it possible to add members to such a static membership cluster
without restarting the other already running tomcat instances?
I figured that in order to add a new member I would need to specify
it in the StaticMembershipInterceptor of all the other nodes. But
editing the server.xml of a running tomcat instance had no effect.
Tomcat will not auto-reload server.xml; there are just too many moving
parts to reload it quickly, so you have to bounce the whole server.
Oddly enough, I was just talking to someone yesterday about how static
membership ought to be updatable via at least JMX. I'm not sure, but
it's possible that static membership is /already updatable via JMX.
Are you comfortable connecting to a local Tomcat using jconsole or
VisualVM and browsing around the "Catalina" tree? I don't have a
clustered setup handy to inspect myself to see if it's already possible.
If it's /not/ currently possible, it really should be.
- -chris
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I already tried to configure the cluster via jmx.
After connecting to a tomcat instance, there was indeed a "Cluster"
object in the tree but I was not able to add/remove existing members there.
This cluster object contains a group called "Member" where all members
of the cluster are listed.
Therefore I was able to query information about the members.
Unfortunately the member objects do not offer any operations at all.
I do not have much experience with jmx but I think that means that the
member-entries are read-only and it is currently not possible to
configure the membership via jmx.
The cluster object itself offers the operations "start", "stop",
"setProperty" and "send" which as far as I understood also do not give
any possibility to add new members.
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