[jira] [Created] (BOOKKEEPER-507) Race condition happens if closeSubscription and subscribe happened at the same time (in multiplexed client).

["Sijie Guo (JIRA)" <ji...@apache.org>]

Sijie Guo created BOOKKEEPER-507:
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             Summary: Race condition happens if closeSubscription and subscribe happened at the same time (in multiplexed client).
                 Key: BOOKKEEPER-507
                 URL: https://issues.apache.org/jira/browse/BOOKKEEPER-507
             Project: Bookkeeper
          Issue Type: Bug
            Reporter: Sijie Guo
            Assignee: Sijie Guo
            Priority: Blocker
             Fix For: 4.2.0


1) closesub first
2) sub late
3) closesub succeed, but response is delayed to client.
4) since closesub succeed in server side, so sub succeed and tried to deliver message.
5) sub response is back
6) client checked and found that there is already a subscriber there.
7) client failed the subscribe request
8) but the message would still be delivered to same channel. since the sub state is not be cleared. message is still be received.
9) closesub response is back.
10) it clear the subscribe state.
11) message continue delivering but found there is no subscriber state.
at step 11) the problem happened.

this race condition is introduced in multiplexed client (BOOKKEEPER-70).

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