Am 17.04.2015 um 14:45 schrieb Christopher Schultz:
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Chris,

On 4/17/15 5:33 AM, Christoph Prybila wrote:

Am 17.04.2015 um 07:45 schrieb Christopher Schultz: 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.
Agreed. Could you file an enhancement request in Bugzilla?

Thanks!

- -chris
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Done. Thanks for the feedback.

https://bz.apache.org/bugzilla/show_bug.cgi?id=57827

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