What is the difference between connection and read timeout for sockets

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3 questions    What is the difference between connection and read timeout for sockets  What does connection timeout set to  infinity  mean  In what situation can it remain in an infinitive loop  and what can trigger that the infinity-loop dies  What does read timeout set to  infinity  mean  In what situation can it remain in an infinitive loop  and what can trigger that the infinity-loop dies

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These are timeout values enforced by JVM for TCP connection establishment and waiting on reading data from socket.

If the value is set to infinity, you will not wait forever. It simply means JVM doesn't have timeout and OS will be responsible for all the timeouts. However, the timeouts on OS may be really long. On some slow network, I've seen timeouts as long as 6 minutes.

Even if you set the timeout value for socket, it may not work if the timeout happens in the native code. We can reproduce the problem on Linux by connecting to a host blocked by firewall or unplugging the cable on switch.

The only safe approach to handle TCP timeout is to run the connection code in a different thread and interrupt the thread when it takes too long.

User · Answer

What is the difference between connection and read  timeout for sockets    The connection timeout is the timeout in making the initial connection  i e  completing the TCP connection handshake   The read timeout is the timeout on waiting to read data1   If the server  or network  fails to deliver any data  lt timeout gt  seconds after the client makes a socket read call  a read timeout error will be raised    What does connection timeout set to  quot infinity quot  mean  In what situation can it remain in an infinitive loop  and what can trigger that the infinity-loop dies    It means that the connection attempt can potentially block for ever   There is no infinite loop  but the attempt to connect can be unblocked by another thread closing the socket    A Thread interrupt   call may also do the trick     not sure     What does read timeout set to  quot infinity quot  mean  In what situation can it remain in an infinite loop   What can trigger that the infinite loop to end    It means that a call to read on the socket stream may block for ever   Once again there is no infinite loop  but the read can be unblocked by a Thread interrupt   call  closing the socket  and  of course  the other end sending data or closing the connection   1 - It is not     as one commenter thought     the timeout on how long a socket can be open  or idle

[java] What is the difference between connection and read timeout for sockets?

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