Default maximum packet size in 3.7.0.1

Hello,
It looks like there is another reason for performing a full cluster restart to apply the first patch for 3.7 (3.7.0.1). On a machine with MTU=1500, it appears that the default maximum packet size value was changed from 1452 to 65535 and this change prevents the cluster from forming during a rolling upgrade.
16 May 2011 14:08:01,376 ERROR Logger@813856187 3.7.0.1: 2011-05-16 14:08:01.376/1.539 Oracle Coherence GE 3.7.0.1 <Error> (thread=Cluster, member=n/a): This member could not join the cluster because of a configuration mismatch between this member and the configuration being used by the rest of the cluster. The maximum packet size (65535) for this member does not match the maximum packet size that the running cluster is using. Rejected by Member(Id=1, Timestamp=2011-05-16 14:05:49.303, Address=XXX2:11500, MachineId=38601, Location=machine:YYY2,process:14945,member:cacheserver:1, Role=cacheserver).
16 May 2011 14:24:27,675 ERROR Logger@98371294 3.7.0.0: 2011-05-16 14:24:27.674/1.539 Oracle Coherence GE 3.7.0.0 <Error> (thread=Cluster, member=n/a): This member could not join the cluster because of a configuration mismatch between this member and the configuration being used by the rest of the cluster. The maximum packet size (1452) for this member does not match the maximum packet size that the running cluster is using. Rejected by Member(Id=1, Timestamp=2011-05-16 14:11:11.927, Address=XXX1:11500, MachineId=38600, Location=machine:YYY1,process:18509,member:cacheserver:1, Role=cacheserver).
Can you please confirm?
Cheers,
Alexey

Hi Alexey,
Yes, the default maximum packet size for 3.7 was supposed to have been 65535, there was however a bug which prevented this from working. 3.7.0.1 fixes this issue, and thus "introduces" the new higher default value. A rolling restart is still possible, you would however need to manually configure the maximum to be 1468. The new maximum of 65535 allows the Coherence default configuration to support large clusters (greater then ~450 JVMs), where as the old default configuration would prevent new members from joining and would require a re-configuration and full restart.
thanks,
Mark
Oracle Coherence

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