[jira] [Updated] (QPID-3079) message.accept command should be completed on a per-dequeue basis

["Ken Giusti (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/QPID-3079?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Ken Giusti updated QPID-3079:
-----------------------------

    Attachment: proposal.txt

high-level design document

> 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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