Qpid
  1. Qpid
  2. QPID-3774

[Java Broker] Allow out of order completion of persistent enqueues / dequeues

    Details

    • Type: Improvement Improvement
    • Status: Closed
    • Priority: Major Major
    • Resolution: Fixed
    • Affects Version/s: 0.14
    • Fix Version/s: 0.15
    • Component/s: Java Broker
    • Labels:
      None

      Description

      Currently each persistent enqueue or dequeue in a non transactional session is processed in strict order with a synchronous write occurring for each enqueue/dequeue.

      In order to improve performance we should make these enqueues/dequeues asynchronous and only wait for completion when a sync is requested.

      Note that due to the way the IO layer works, we cannot make this truly asynchronous as we need to synchronize before control is handed back to the IO layer as it then performs a blocking read. if the client is waiting for the completion from the broker it will never send more data on the wire, and since the read is blocking the broker cannot check to see if the async write to disk has completed. In practice tests have shown that this does not significantly change the maximum possible throughput.

        Activity

        Rob Godfrey created issue -
        Rob Godfrey made changes -
        Field Original Value New Value
        Status Open [ 1 ] In Progress [ 3 ]
        Rob Godfrey made changes -
        Status In Progress [ 3 ] Ready To Review [ 10006 ]
        Robbie Gemmell made changes -
        Status Ready To Review [ 10006 ] Resolved [ 5 ]
        Resolution Fixed [ 1 ]
        Keith Wall made changes -
        Resolution Fixed [ 1 ]
        Status Resolved [ 5 ] Reopened [ 4 ]
        Assignee Rob Godfrey [ rgodfrey ] Keith Wall [ k-wall ]
        Keith Wall made changes -
        Status Reopened [ 4 ] Closed [ 6 ]
        Resolution Fixed [ 1 ]
        Rob Godfrey made changes -
        Component/s Java Broker BDB Store [ 12315809 ]

          People

          • Assignee:
            Keith Wall
            Reporter:
            Rob Godfrey
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            Dates

            • Created:
              Updated:
              Resolved:

              Development