dirty socket growth problem

All



I am using jdk1.4 to run an RMI program and I have a socket growth problem
on linux and solaris (I have not tried windows).  The problem is that every
5 minutes we see an increase in sockets using the following command (as
root):



/usr/sbin/lsof -p 9706



java    9706 root  594u  sock    0,0           618721 can't identify
protocol

java    9706 root  595u  sock    0,0           623390 can't identify
protocol

java    9706 root  596u  sock    0,0           618749 can't identify
protocol

java    9706 root  598u  sock    0,0           623394 can't identify
protocol

etc...



On solaris I think this just keeps growing and growing (but does not die).
On linux it gets to a certain size and then has a problem.



We are using our own socket factories and so I added debug to figure out why
we were creating so many sockets.  Anyway it turns out it was not our socket
factory.  I turned on the RMI debug and discovered the sockets increase
every time the lease is renewed:



...

FINER: RMI TCP Connection(2)-192.168.1.47: call dispatcher

Dec 5, 2005 3:42:29 PM sun.rmi.server.UnicastServerRef logCall

FINER: RMI TCP Connection(2)-192.168.1.47: [192.168.1.47:
sun.rmi.transport.DGCImpl[0:0:0, 2]: java.rmi.dgc.Lease
dirty(java.rmi.server.ObjID[], long, java.rmi.dgc.Lease)]

...



We tried testing the code with jdk1.3.1_02 and this problem does not occur.
Also on jdk1.4.1_07 I can prevent the sockets growing by just increasing the
lease time to some very large number.



Please help me find a solution that does not require setting a very large
lease time.



Thanks,



Stuart




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