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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localemanager(8)					    BSD System Manager's Manual 					  localemanager(8)

NAME
localemanager -- Configure OpenDirectory Server Locales SYNOPSIS
localemanager operation [-l localename] [-subnet 1.2.3.4/5] [-server servername] [-i IP address] DESCRIPTION
localemanager creates, destroys, and edits OpenDirectory Server Locale information. Locales are collections of OpenDirectory servers to assist clients in locating the nearest OpenDirectory Server. To use OpenDirectory Server Locales, simply create a locale on an OD server with the createLocale operation. Then add servers and subnets to the locale. All localemanager operations are performed on the local OpenDirectory node. The first time a locale is created, a DefaultLocale will automatically be created as well. The DefaultLocale will be used for any clients that don't match a subnet in any other locale. Before a locale can be configured, the server must already be an OpenDirectory server. Locales can be defined on each of the OD servers or on a single OD server in the group of OD master/replicas. For the latter, the locale information will get replicated to all of the other servers but locales will need to be "enabled" on the other servers by running the command localemanager enableLocales. Commands: help Displays the commands and options. createLocale Creates a new locale on the local OD server. This command requires the -l option. deleteLocale Deletes a locale from the local OD server. This command requires the -l option. showLocale Displays the current locale(s). The -l option can be used to display a specific locale. If -l is not specified, all locales are displayed. enableLocales Enables the use of locales on an OD server. This command is automatically run the first time any localemanager command is run on an OD server. Therefore this command only needs to be run if no other localemanager commands have been (or will be) run on this server. addSubnet Adds a new subnet to the specified locale. This command requires the -l -subnet options. removeSubnet Removes a subnet from the specified locale. This command requires -l -subnet options. addServer Adds a server to the specified locale. This command requires the -l -server options. If the -i option is specified, that IP address will be used by locale clients. This may be useful for multi-homed servers to restrict locale clients to a specific network interface. If the -i option is not specified the IP address(es) will be looked up. removeServer Removes a server from the specified locale. This command requires -l -server options. If the -i option is specified, only that IP address will be removed from the locale. If the -i option is no specified, all of the server's IP addresses will be removed from the locale. Options: -l locale Locale name. -subnet 192.168.0.0/16 Subnet specified in CIDR notation. -server server.example.com Server fully-qualified domain name. -i 192.168.1.1 Use this IP address for the server. Typically used to limit locale clients to a specific interface on a multi-homed server. FILES
/var/log/localemanager.log localemanager log file. SEE ALSO
slapconfig(8) HISTORY
First introduced in Mac OS X 10.7 Darwin June 2, 2019 Darwin