Gabriel Gerhardsson created AMQ-4022:
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Summary: SEND directly after SUBSCRIBE causes bad state -> no
DISCONNECT receipt
Key: AMQ-4022
URL: https://issues.apache.org/jira/browse/AMQ-4022
Project: ActiveMQ
Issue Type: Bug
Components: stomp
Affects Versions: 5.5.1
Environment: SLES11-SP1 x86_64
Reporter: Gabriel Gerhardsson
Attachments: amqtest.pl, Net_Stomp.pm.diff
Executive summary
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A message is lost, the connection ends up in a strange state, and then when the
client sends DISCONNECT it gets no receipt.
Details
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Steps to reproduce:
1) Using STOMP
2) Send a SUBSCRIBE message with destination=/topic/foo, without asking for a
receipt. No other options sent in message.
3) Send a message to /topic/foo, without asking for a receipt.
4) Wait 10ms for message
5) Go right ahead and send DISCONNECT message, asking for a receipt.
5.1) About 20% of the time, no DISCONNECT receipt is received, however long the
client waits. This seems to coincide with the case when the message doesn't
arrive in #4.
5.2) It does look like ActiveMQ gets the DISCONNECT message tho since it
unsubscribes the client from /topic/foo at that timestamp.
The DISCONNECT receipt getting lost is clearly a bug. Waiting for the receipt
is important since I've seen cases where the client isn't unregistered properly
in ActiveMQ if the client just sends DISCONNECT and then closes the socket.
Test script
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Apply the small patch to Net/Stomp.pm
It's a naive minimal patch to make it wait for a receipt for the DISCONNECT
message. It will actually just wait for any frame to arrive and won't check
what it is, but it's enough for this test.
Run amqtest.pl a few times. A non-buggy run completes almost immediately. A
buggy run hangs the script during disconnect.
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