MMBase MultiCast errors

[Andr� van Toly]

Hi,

In the following setup (JDK 1.4):
  1 MMBase 1.6.5 webapp with EditWizards
  3 MMBase 1.6.5 webapps with live sites
Apache Tomcat/4.1.29 displays 
java.lang.OutOfMemoryError's while MMBase 
multicasts the changes that were made in 
EditWizard webapp to the other webapps. When you 
save a wizard with for example a news article 
with related urls and images, MMBase believes all 
these nodes were changed an will multicast these 
events over all 3 webapps.

I think the java.lang.OutOfMemoryError is caused 
because MMBase tries to start more threads than 
Tomcat can handle or is allowed to start (default 
its 75 in our set-up 60). Is this is a bug in 
MMBase? Should MMBase use a thread pool with a 
maximum number of threads? Or some sort of 
queuing mechanism which puts the multicast 
threads in a queu untill there is room to execute 
them?

---Andr�

Starting service Tomcat-Standalone
Apache Tomcat/4.1.29
Apr 13, 2004 12:29:31 PM org.apache.coyote.http11.Http11Protocol start
INFO: Starting Coyote HTTP/1.1 on port 8888
java.lang.OutOfMemoryError: unable to create new native thread
        at java.lang.Thread.start(Native Method)
        at 
org.mmbase.module.core.MMBaseMultiCastProbe.start(MMBaseMultiCastProbe.java:95)
        at 
org.mmbase.module.core.MMBaseMultiCastProbe.init(MMBaseMultiCastProbe.java:85)
        at 
org.mmbase.module.core.MMBaseMultiCastProbe.<init>(MMBaseMultiCastProbe.java:81)
        at 
org.mmbase.module.core.MMBaseMultiCast.handleMsg(MMBaseMultiCast.java:181)
        at 
org.mmbase.module.core.MultiCastChangesReceiver.doWork(MultiCastChangesReceiver.java:141)
        at 
org.mmbase.module.core.MultiCastChangesReceiver.run(MultiCastChangesReceiver.java:112)
        at java.lang.Thread.run(Thread.java:536)
java.lang.OutOfMemoryError: unable to create new native thread
        at java.lang.Thread.start(Native Method)
        at 
org.mmbase.module.core.MMBaseMultiCastProbe.start(MMBaseMultiCastProbe.java:95)
        at 
org.mmbase.module.core.MMBaseMultiCastProbe.init(MMBaseMultiCastProbe.java:85)
        at 
org.mmbase.module.core.MMBaseMultiCastProbe.<init>(MMBaseMultiCastProbe.java:81)
        at 
org.mmbase.module.core.MMBaseMultiCast.handleMsg(MMBaseMultiCast.java:186)
        at 
org.mmbase.module.core.MultiCastChangesReceiver.doWork(MultiCastChangesReceiver.java:141)
        at 
org.mmbase.module.core.MultiCastChangesReceiver.run(MultiCastChangesReceiver.java:112)
        at java.lang.Thread.run(Thread.java:536)
java.lang.OutOfMemoryError: unable to create new native thread
        at java.lang.Thread.start(Native Method)
        at 
org.mmbase.module.core.MMBaseMultiCastProbe.start(MMBaseMultiCastProbe.java:95)
        at 
org.mmbase.module.core.MMBaseMultiCastProbe.init(MMBaseMultiCastProbe.java:85)
        at 
org.mmbase.module.core.MMBaseMultiCastProbe.<init>(MMBaseMultiCastProbe.java:81)
        at 
org.mmbase.module.core.MMBaseMultiCast.handleMsg(MMBaseMultiCast.java:186)
        at 
org.mmbase.module.core.MultiCastChangesReceiver.doWork(MultiCastChangesReceiver.java:141)
        at 
org.mmbase.module.core.MultiCastChangesReceiver.run(MultiCastChangesReceiver.java:112)
        at java.lang.Thread.run(Thread.java:536)

--
------------------------------------------------------------------>><<--
Andr� van Toly
http://www.toly.nl
06-27233562