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SocketException : Connection Reset

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Old 12-08-2010
SocketException : Connection Reset
Hi,

I am currently working on a Server/Client application on a cluster

I am running about 100 clients in parallel and one server (32 clients per node with 8 processor => 4 clients per processor) . The server is linked to all the clients via Sockets.

After about 55 iteration (about 20 mins), i have a client dying and i receive the following error:

Client 126 java.net.SocketException: Connection reset
at java.net.SocketInputStream.read(SocketInputStream. java:16
at java.net.SocketInputStream.read(SocketInputStream. java:182)
at java.io.ObjectInputStream$PeekInputStream.peek(Obj ectInputStream.java:2249)
at java.io.ObjectInputStream$BlockDataInputStream.pee k(ObjectInputStream.java:2542)
at java.io.ObjectInputStream$BlockDataInputStream.pee kByte(ObjectInputStream.java:2552)
at java.io.ObjectInputStream.readObject0(ObjectInputS tream.java:1297)
at java.io.ObjectInputStream.readObject(ObjectInputSt ream.java:351)
at ServerClient.Server$TcpThread.run(Server.java:789)
Connection reset


the Server.java.789 is : ServerThread.sockIn.readObject();


Do you have any idea what could create the connection reset ? The other clients are still running. It seems that the client socket is creating an exception when we try to read a file which actually does not exist.

My main question is what are the method to identify the problem related to this specific socket (note that I am working on a cluster, hence accessing the node via ssh connection and without having admin access).

I dont understand why suddenly one client would die. It was working well during 20 minutes and suddenly one die ? Do you have any idea and any advice on how to identify the reset of this Socket disconnection ?

I though about using wireshark but the fact that the application is running on a cluster make it difficult to analyze,sniff the packets remotely. I dont know if i can do it remotely.

Do you have any idea how I could debug this problem?

Thanks
masy1800
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LEARN ABOUT SUSE

iceccd

ICECREAM 
DAEMON(1)					      Icecream User's Manual						ICECREAM DAEMON(1)

NAME

       iceccd - Icecream daemon

SYNOPSIS

       iceccd [-n netname] [-m max_processes] [--no-remote] [-w] [-d | --daemonize] [-l logfile] [-s schedulerhost] [-v [v [v]]] [-r |
	      --run-as-user] [-b env-basedir] [-u | --nobody-uid nobodyuid] [--cache-limit MB] [-N hostname]

DESCRIPTION

       The Icecream daemon has to run on all nodes being part of the Icecream compile cluster. It receives compile jobs and executes them in a ch-
       root environment. The compile clients send their compile environment the first time they send a job to a particular daemon, so that the en-
       vironment of the daemon doesn't have to match the one of the client.

       The daemon also has to run on clients sending compile jobs to the Icecream network. If a node should be able to send compile jobs, but nev-
       er receive any, start the daemon with the option -m 0.

       All Icecream daemons need to have contact to the Icecream scheduler which controls the distribution of data between compile nodes. Normally
       the daemon will automatically find the right scheduler. If this is not the case you can explicitly specify the name of the Icecream network
       and the host running the scheduler.

OPTIONS

       -n netname
	      The  name  of  the icecream network the daemon should connect to. There has to be a scheduler running for the network under the same
	      network name.

       -m max_processes
	      Maximum number of compile jobs started in parallel on machine running the daemon.

       --no-remote
	      Prevents jobs from other nodes being scheduled on this one.

       -w

       -d, --daemonize
	      Detach daemon from shell.

       -l logfile
	      Name of file where log output is written to.

       -s scheduler_host
	      Name of host running the scheduler for the network the daemon should connect to. This option  might  help  if  the  scheduler  can't
	      broadcast its presence to the clients due to firewall settings or similar reasons.

       -v, -vv, -vvv
	      Control verbosity of daemon. The more v the more verbose.

       -r, --run-as-user
	      Force running the daemon with user rights. Usually you will need to run the daemon with root rights.

       -b env_basedir
	      Base directory for storing compile environments sent to the daemon by the compile clients.

       -u, --nobody-uid nobodyuid
	      Id of user nobody. This user id is used when the daemon is dropping privileges.

       --cache-limit MB
	      Maximum size in Mega Bytes of cache used to store compile environments of compile clients.

       -N hostname
	      The name of the icecream host on the network.

SEE ALSO

       icecream, scheduler, iceccd, icemon

AUTHOR

       Cornelius Schumacher

Icecream							 April 21th, 2005						ICECREAM DAEMON(1)