SocketException : Connection Reset

12-08-2010

masy1800

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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

processor_sets(4) Kernel Interfaces Manual processor_sets(4) NAME
processor_sets - Collections of processors DESCRIPTION
A processor set is a collection of processors. When a processor set is first created, it does not contain any processors. You can add processors to a processor set, remove processors from a processor set, and also destroy the processor set. In addition, you can assign specific processes to a processor set. When the system is booted, all its processors are assigned to the default processor set. Each processor in a system can be a member of only one processor set at one time. In addition, when you create a process, it is assigned to a processor set. Unless you indicate a specific processor set, a process is assigned to the default processor set. A process can execute only on an processor that is included in the processor set to which the process is assigned. If you assign a process to an empty processor set, it will not execute until a processor is assigned to the processor set or until the process is assigned to another processor set. Use the pset_create command or the create_pset function to create a processor set. When you first create a processor set, it does not con- tain any processors. Use the pset_assign_cpu command or the assign_cpu_to_pset function to assign processors to a specific processor set. When you assign a processor to a specific processor set, the processor is removed from its current processor set. Use the pset_destroy command or the destroy_pset function to destroy a processor set. Processors that belong to a destroyed processor set are assigned to the default processor set. Use the pset_assign_pid command or the assign_pid_to_pset function to assign a process to a specific processor set. In addition, you can request that a process has exclusive access to a processor set. If a process has exclusive access to a processor set, no other process is able to use that processor set. If a process has exclusive access to a processor set, that access will be cleared automatically when the process exits. Note that if a process is already assigned to a processor set, a request for exclusive access to that processor set will be denied. Use the pset_info command to display the status of each processor set on the system as well as the status of each processor. You must be root to create and destroy processor sets and to assign a processor to a processor set. Processor set creation and destruction and processor assignments to processor sets are logged in the /var/adm/wtmp file. FILES
/var/adm/wtmp RELATED INFORMATION
Commands: pset_create(1), pset_destroy(1), pset_info(1), pset_assign_pid(1), pset_assign_cpu(1), runon(1), psrinfo(1), psradm(8) Functions: assign_pid_to_pset(3), assign_cpu_to_pset(3), create_pset(3), destroy_pset(3) delim off processor_sets(4)

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SocketException : Connection Reset

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