TCP server does not detect the client network failure

From: Mariya (mariya.k_at_gmail.com)
Date: 07/31/04

  • Next message: Matthew: "Re: JAVAMAIL SMTP error 421" 
    Date: 30 Jul 2004 17:48:06 -0700

    Hi,

    This is a behavior of the TCP socket in Java I dont' understand:.
    Let say we have a simple client/server application running on TWO different
    machines.
    The client send bytes to the server.
    The server recieved the bytes and wait for about X sec.
    During this waiting time, we disconnect the server from the network (just by
    unplugging the server network cable).
    After the waiting time the server is aware of the network failure (a
    SocketException is thrown : connection reset, because it is trying to send
    the response)
    But on the client side it is still stuck on a "rcv =
    commandInput.readLine();" statement (see after for the complete code), it
    will never be aware of the network failure !!! Even after one hour the
    client is still waiting to read something on a closed socket. Is this the
    normal behavior ?

    In reality we are dealing with an application that use the FTP server to
    server mode (we are controlling only the command socket, the data transfer
    is made by the servers). We have to transfer huge files, thus we can not set
    up a time out. If the last scenario occurs, some of our transfers are stuck
    and it is not possible for us to detect the failure. The client will wait
    for ever the response.

    Does anybody have already deal with that

  • Next message: Matthew: "Re: JAVAMAIL SMTP error 421"

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