[jira] [Created] (NIFI-3375) Add a option expiration/timeout for idle connections to SocketChannelDispatcher

["Joseph Percivall (JIRA)" <ji...@apache.org>]

Joseph Percivall created NIFI-3375:
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             Summary: Add a option expiration/timeout for idle connections to SocketChannelDispatcher
                 Key: NIFI-3375
                 URL: https://issues.apache.org/jira/browse/NIFI-3375
             Project: Apache NiFi
          Issue Type: Improvement
            Reporter: Joseph Percivall


Originally found with the ListenTCP processor, it would be nice to have the ability to specify a timeout on which to expire idle connections.

The SocketChannelDispatcher runs an infinite loop checking all the selectorKeys available and imposes a hard limit of the total number connections. At the end of each iteration of the loop it marks all idle sockets as READ_ABLE[1]. Then in the Socket Handler, it only marks the socket as closed if the socketChannel returns -1[2]. Returning 0 is valid for non-blocking socket channel[3], so If a client never closes the connection then this connection will remain open forever.

There should be an option to expire connections after a certain length of time without data being read.


[1] https://github.com/JPercivall/nifi/blob/372ffb8aa08ad51a8faf25e56b794183df9f8a4a/nifi-commons/nifi-processor-utilities/src/main/java/org/apache/nifi/processor/util/listen/dispatcher/SocketChannelDispatcher.java#L212-L212
[2] https://github.com/JPercivall/nifi/blob/372ffb8aa08ad51a8faf25e56b794183df9f8a4a/nifi-commons/nifi-processor-utilities/src/main/java/org/apache/nifi/processor/util/listen/handler/socket/StandardSocketChannelHandler.java#L87-L87
[3] http://stackoverflow.com/a/11451152/5252122



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