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https://issues.apache.org/jira/browse/QPID-3079?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13047088#comment-13047088
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jirapos...@reviews.apache.org commented on QPID-3079:
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bq. On 2011-06-10 00:22:59, Kenneth Giusti wrote:
bq. > /branches/qpid-3079/qpid/cpp/src/qpid/broker/PersistableQueue.h, line 64
bq. > <https://reviews.apache.org/r/860/diff/1/?file=20820#file20820line64>
bq. >
bq. > The pointer is actually _shared_ between the MessageStoreImpl and
the Queue. My changes caused a bug where, if the queue was deleted _before_ a
pending dequeue completed, then the queue was destroyed during the
MessageStoreImpl destructor, which was using the pointer to do the flush. I
think explicitly making it shared is the right thing to do.
That still seems like an issue for the store implementation to handle. The
broker never touches this external store, its simply a convenience offered to
the store impl to avoid it having to lookup extra state it wants for the queue.
- Gordon
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On 2011-06-08 20:31:05, Kenneth Giusti wrote:
bq.
bq. -----------------------------------------------------------
bq. This is an automatically generated e-mail. To reply, visit:
bq. https://reviews.apache.org/r/860/
bq. -----------------------------------------------------------
bq.
bq. (Updated 2011-06-08 20:31:05)
bq.
bq.
bq. Review request for qpid, Alan Conway, Gordon Sim, and Kim van der Riet.
bq.
bq.
bq. Summary
bq. -------
bq.
bq. Modifies the broker's handling of Message.Accept to hold off the
completion of the command until all messages related to the accept have
completed dequeue. This particularly applies to persistent messages, as the
store::dequeue() operation must complete before the message is considered fully
dequeued.
bq.
bq. Note this bugfix requires some changes to the broker's store module
interface: previously, the store only identified the message when a dequeue
was completed. This is not enough information - the queue from which is was
removed must also be identified (the message may be in the process of being
dequeued on several queues at once).
bq.
bq.
bq. This addresses bug qpid-3079.
bq. https://issues.apache.org/jira/browse/qpid-3079
bq.
bq.
bq. Diffs
bq. -----
bq.
bq. /branches/qpid-3079/qpid/cpp/src/qpid/broker/AsyncCompletion.h 1124895
bq. /branches/qpid-3079/qpid/cpp/src/qpid/broker/DeliveryRecord.h 1124895
bq. /branches/qpid-3079/qpid/cpp/src/qpid/broker/DeliveryRecord.cpp 1124895
bq. /branches/qpid-3079/qpid/cpp/src/qpid/broker/Message.h 1124895
bq. /branches/qpid-3079/qpid/cpp/src/qpid/broker/Message.cpp 1124895
bq. /branches/qpid-3079/qpid/cpp/src/qpid/broker/MessageStore.h 1124895
bq. /branches/qpid-3079/qpid/cpp/src/qpid/broker/MessageStoreModule.h
1124895
bq. /branches/qpid-3079/qpid/cpp/src/qpid/broker/MessageStoreModule.cpp
1124895
bq. /branches/qpid-3079/qpid/cpp/src/qpid/broker/NullMessageStore.h 1124895
bq. /branches/qpid-3079/qpid/cpp/src/qpid/broker/NullMessageStore.cpp
1124895
bq. /branches/qpid-3079/qpid/cpp/src/qpid/broker/PersistableMessage.h
1124895
bq. /branches/qpid-3079/qpid/cpp/src/qpid/broker/PersistableMessage.cpp
1124895
bq. /branches/qpid-3079/qpid/cpp/src/qpid/broker/PersistableQueue.h 1124895
bq. /branches/qpid-3079/qpid/cpp/src/qpid/broker/Queue.h 1124895
bq. /branches/qpid-3079/qpid/cpp/src/qpid/broker/Queue.cpp 1124895
bq. /branches/qpid-3079/qpid/cpp/src/qpid/broker/RecoverableQueue.h 1124895
bq. /branches/qpid-3079/qpid/cpp/src/qpid/broker/RecoveryManagerImpl.cpp
1124895
bq. /branches/qpid-3079/qpid/cpp/src/qpid/broker/SemanticState.cpp 1124895
bq. /branches/qpid-3079/qpid/cpp/src/qpid/broker/SessionContext.h 1124895
bq. /branches/qpid-3079/qpid/cpp/src/qpid/broker/SessionState.h 1124895
bq. /branches/qpid-3079/qpid/cpp/src/qpid/broker/SessionState.cpp 1124895
bq. /branches/qpid-3079/qpid/cpp/src/tests/AsyncCompletion.cpp 1124895
bq. /branches/qpid-3079/qpid/cpp/src/tests/QueueTest.cpp 1124895
bq. /branches/qpid-3079/qpid/cpp/src/tests/TestMessageStore.h 1124895
bq.
bq. Diff: https://reviews.apache.org/r/860/diff
bq.
bq.
bq. Testing
bq. -------
bq.
bq. broker unit tests, store unit tests (modified jboss store). Still needs
to be vetted on non-linux, and have latest trunk merged in.
bq.
bq.
bq. Thanks,
bq.
bq. Kenneth
bq.
bq.
> message.accept command should be completed on a per-dequeue basis
> -----------------------------------------------------------------
>
> Key: QPID-3079
> URL: https://issues.apache.org/jira/browse/QPID-3079
> Project: Qpid
> Issue Type: Bug
> Components: C++ Broker
> Affects Versions: 0.8, 0.9
> Reporter: Ken Giusti
> Assignee: Ken Giusti
> Fix For: 0.11
>
> Attachments: proposal.txt
>
>
> ** Overview
> Asynchronous completion means that command execution is initiated in one
> thread
> (a client connection thread) and completed in a different thread.
> When the async store is loaded, message.transfer commands are
> completed by a store thread that does the async write.
> ** Issues with asynchronous completion code as of revision r1029686
> *** Not really asynchronous
> IncompleteMessageList::process blocks the connection thread till all
> outstanding async commands (messages) for the session are complete.
> With the new cluster, this could deadlock since it is blocking a Poller
> thread.
> *** Race condition for message.transfer
>
> Sketch of the current code:
> // Called in connection thread
> PersistableMessage::enqueueAsync { ++counter; }
> // Called in store thread once message is written.
> PersistableMessage::enqueueComplete { if (--counter == 0) notifyCompleted(); }
> The intent is that notify be called once per message, after the
> message has been written to each queue it was routed to.
> However of a message is routed to N queues, it's possible for
> notifyCompleted to be called up to N times. The store thread could
> call notifyCompleted for the first queue before the connection thread
> has called enqueueAsync for the second queue, and so on.
> *** No asynchronous completion for message.accept
> We do not currently delay completion of message.accept until the
> message is deleted from the async store. This could cause duplicate
> delivery if the broker crashes after completing the message but
> before it is removed from store.
> There is code in PersistableMessage to maintain a counter for dequeues
> analogous to to the async enqueue code but this is incorrect.
> Completion of transfer is triggered when all enqueues for a message are
> complete.
> Completion of accept is triggered for *each* dequeue from a queue
> independently.
> Furthermore a single accept can reference many messages, so it can't be
> associated with a message.
> ** New requirements
> The new cluster design will need to participate in async completion, e.g.
> an accept cannot be comlpeted until the message is
> - removed from store (if present) AND
> - replicated to the cluster (if present) as dequeued
> The new cluster also needs to asynchronously complete binding commands
> (declare, bind, delete) when they are replicated to the cluster.
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