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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PG_CTLCLUSTER(8)					 Debian PostgreSQL infrastructure					  PG_CTLCLUSTER(8)

NAME
pg_ctlcluster - start/stop/restart/reload a PostgreSQL cluster SYNOPSIS
pg_ctlcluster [options] cluster-version cluster-name action -- [pg_ctl options] where action = start|stop|restart|reload|promote DESCRIPTION
This program controls the postmaster server for a particular cluster. It essentially wraps the pg_ctl(1) command. It determines the cluster version and data path and calls the right version of pg_ctl with appropriate configuration parameters and paths. You have to start this program as the user who owns the database cluster or as root. ACTIONS
start A log file for this specific cluster is created if it does not exist yet (by default, /var/log/postgresql/postgresql-cluster- version-cluster-name.log), and a PostreSQL server process (postmaster(1)) is started on it. Exits with 0 on success, with 2 if the server is already running, and with 1 on other failure conditions. stop Stops the postmaster(1) server of the given cluster. By default, "smart" mode is used, which waits until all clients disconnected. With the --force option the "fast" mode is used which rolls back all active transactions, disconnects clients immediately and thus shuts down cleanly. If that does not work, shutdown is attempted again in "immediate" mode, which can leave the cluster in an inconsistent state and thus will lead to a recovery run at the next start. If this still does not help, the postmaster process is killed. Exits with 0 on success, with 2 if the server is not running, and with 1 on other failure conditions. This mode should only be used when the machine is about to be shut down. restart Stops the server if it is running and starts it (again). reload Causes the configuration files to be re-read without a full shutdown of the server. promote Commands a running standby server to exit recovery and begin read-write operations. OPTIONS
-o option Pass given option as command line option to the postmaster process. It is possible to specify -o multiple times. See postmaster(1) for a description of valid options. pg_ctl options Pass given pg_ctl options as command line options to pg_ctl. See pg_ctl(1) for a description of valid options. FILES
/etc/postgresql/cluster-version/cluster-name/pg_ctl.conf This configuration file contains cluster specific options to be passed to pg_ctl(1). SEE ALSO
pg_ctl(1), pg_wrapper(1), pg_lsclusters(1), postmaster(1) AUTHOR
Martin Pitt <mpitt@debian.org> Debian 2012-10-08 PG_CTLCLUSTER(8)