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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KNIFE-CLIENT(1) 						    Chef Manual 						   KNIFE-CLIENT(1)

NAME
knife-client - Manage Chef API Clients SYNOPSIS
knife client sub-command (options) SUB-COMMANDS Client subcommands follow a basic create, read, update, delete (CRUD) pattern. The Following subcommands are available: BULK DELETE
knife client bulk delete regex (options) Delete clients where the client name matches the regular expression regex on the Chef Server. The regular expression should be given as a quoted string, and not surrounded by forward slashes. CREATE
knife client create client name (options) -a, --admin Create the client as an admin -f, --file FILE Write the key to a file Create a new client. This generates an RSA keypair. The private key will be displayed on STDOUT or written to the named file. The public half will be stored on the Server. For chef-client systems, the private key should be copied to the system as /etc/chef/client.pem. Admin clients should be created for users that will use knife to access the API as an administrator. The private key will generally be copied to ~/.chef/client\_name.pem and referenced in the knife.rb configuration file. DELETE
knife client delete client name (options) Deletes a registered client. EDIT
client edit client name (options) Edit a registered client. LIST
client list (options) -w, --with-uri Show corresponding URIs List all registered clients. REREGISTER
client reregister client name (options) -f, --file FILE Write the key to a file Regenerate the RSA keypair for a client. The public half will be stored on the server and the private key displayed on STDOUT or written to the named file. This operation will invalidate the previous keypair used by the client, preventing it from authenticating with the Chef Server. Use care when reregistering the validator client. SHOW
client show client name (options) -a, --attribute ATTR Show only one attribute Show a client. Output format is determined by the --format option. DESCRIPTION
Clients are identities used for communication with the Chef Server API, roughly equivalent to user accounts on the Chef Server, except that clients only communicate with the Chef Server API and are authenticated via request signatures. In the typical case, there will be one client object on the server for each node, and the corresponding client and node will have identical names. In the Chef authorization model, there is one special client, the "validator", which is authorized to create new non-administrative clients but has minimal privileges otherwise. This identity is used as a sort of "guest account" to create a client identity when initially setting up a host for management with Chef. SEE ALSO
knife-node(1) AUTHOR
Chef was written by Adam Jacob adam@opscode.com with many contributions from the community. DOCUMENTATION
This manual page was written by Joshua Timberman joshua@opscode.com. Permission is granted to copy, distribute and / or modify this docu- ment under the terms of the Apache 2.0 License. CHEF
Knife is distributed with Chef. http://wiki.opscode.com/display/chef/Home Chef 10.12.0 June 2012 KNIFE-CLIENT(1)