Chris Nauroth created ZOOKEEPER-1702:
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Summary: ZooKeeper client may write operation packets before
receiving successful response to connection request, can cause TCP RST
Key: ZOOKEEPER-1702
URL: https://issues.apache.org/jira/browse/ZOOKEEPER-1702
Project: ZooKeeper
Issue Type: Bug
Components: java client
Affects Versions: 3.4.2
Reporter: Chris Nauroth
The problem occurs when a connection attempt is pending and there are multiple
outbound packets in the queue for other operations. In
{{ClientCnxnSocketNIO#doIO}}, it is possible to receive notification that the
socket is writable for the next operation packet before receiving notification
that the socket is readable for the connection response from the server. If
the server decides that the session is expired, then it responds by immediately
closing the socket on its side. If the client has written packets after the
server has closed its end of the socket, then the TCP stack may choose to abort
the connection with an RST. When this happens, the client doesn't receive an
orderly shutdown, and ultimately it fails to deliver a session expired event to
the application.
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