NIO SocketChannel send guarantees

[Krajcsovszki, Gergely]

Hi Team,

We are using NIO SocketChannels to exchange data over TCP. A colleague noticed that if he writes a lot of data to the socket channel, closes it, then immediately exits the application (either via System.exit() or just letting the main() method return) sometimes some of the data is not sent, even if he flushes before closing. After adding a wait loop until the underlying socket's isOutputShutdown() and isClosed() methods return true the problem went away.

This got us thinking, what are the guarantees of NIO? What could happen to the already written data if


1.       The application terminates

2.       The JVM crashes

3.       The OS crashes

after


1.       socketChannel.write(...)

2.       socketChannel.close() (following multiple writes)

returns?

Can the settings influence this somehow?

We are using various versions of Oracle JDK 7 and 8, all we tried seem to exhibit the same behavior. We've only tried it on Windows 7 64bit, but Linux behavior (if different) is perhaps even more interesting to us.

Thank you very much for your help,

Gergely Krajcsovszki



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