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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 ULTRIX

dms

dms(8)							      System Manager's Manual							    dms(8)

Name
       dms - diskless management services utility

Syntax
       /etc/dms

Description
       The  utility  performs  diskless  management services.  You can use to install products into diskless management services areas on a server
       machine and register diskless clients so that they can access those products on the server machine, rather than having each client  install
       the  products  to a disk on its local machine.  The server machine can be either a VAX or a RISC machine and it can serve both VAX and RISC
       clients.

       Before you set up a diskless management services area on a server, the following software should be installed: Local  Area  Network  (LAN);
       Network File System (NFS); and Maintenance Operations Protocol (MOP).

       The utility performs the following functions:

       a - Add Client Processor

       m - Modify Client Parameters

       r - Remove Client Processor

       l - List Registered Clients

       s - Show Products in Diskless Environments

       i - Install Software

       c - Create Diskless Area on Disk

       k - Kernel Rebuild or Copy

       To set up a diskless management services area on a server, select functions in the following order:

       1.   Create Diskless Area on Disk (c)

	      This sets up the disk partitions needed for the two diskless management services file systems, and (The question mark (?) represents
	      a unique number assigned by The file system contains a common root area that is copied to each client when it is registered,  and  a
	      area  that  is  shared  by  all  the  clients.  The file system contains a copy of the common root area for each registered diskless
	      client.

       2.   Install Software (i)

	      This installs the products from the distribution media to the file system.  If the product will be  accessed  by	VAX  clients,  the
	      images  from the media are put under a directory under the file system.  If the product will be accessed by RISC clients, the images
	      from the media will be put under a directory under the file system.  The question mark (?) represents a unique number assigned by

       To register a diskless client, select the Add Client Processor option (a).  This copies the common root area in the file system, for  exam-
       ple,  to  the  diskless	client's directory in the file system, for example, The server's file is updated to allow the client to access its
       individual root and the shared area.

       Each diskless client's area also contains a client parameter file,

       You must use interactively to set up a diskless environment or to modify client parameters.

       There are several functions you can use either interactively or from the command line:

       - Add Client Processor

       - Show Products in Diskless Environments

       - Remove Client Processor

       - Kernel Rebuild

       When the first diskless client is registered for a diskless management services area, a database file, is created on  the  server  machine.
       You can use this file and the command line to manage groups of diskless clients.

Files
See Also
       exports(5nfs), addnode(8), setld(8)
       Guide to Diskless Management Services
       Guide to Server Setup

																	    dms(8)