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From "Pavel Moravec" <pmora...@redhat.com>
Subject Review Request 23545: [C++ client] Allow consumer flow control based on #bytes
Date Wed, 16 Jul 2014 09:59:00 GMT

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Review request for qpid, Gordon Sim and mick goulish.

Bugs: QPID-5895

Repository: qpid


AMQP 0-10:
byteCredit in 0-10 ReceiverImpl renamed to byteWindow.

Both (message and byte) window/capacity operate independently on each other.

I had to add SessionImpl::getMaxPrefetchedBytes to get around pre-declared class Connection.

AMQP 1.0:
If max-prefetched-bytes to be used, I fixed maxFrameForBytePrefetch in 'open' performative
to 8k. That should be enough high for most of messages and should provide sufficient granularity
of incoming-window.

Note, pn_session_set_incoming_capacity sets session's byte capacity whereas incoming_window
is returned by proton method:

size_t pn_session_incoming_window(pn_session_t *ssn)
  uint32_t size = ssn->connection->transport->local_max_frame;
  if (!size) {
    return 2147483647; // biggest legal value
  } else {
    return (ssn->incoming_capacity - ssn->incoming_bytes)/size;

If a user sets max-prefetched-bytes below 8k, the client will automatically increase it to
8k with some warning (otherwise incoming-window would be zero and no consumer would get a
single message).

Note, the 1.0 patch does not work due to QPID-5896 I plan to fix first.


  /trunk/qpid/cpp/src/qpid/client/amqp0_10/ConnectionImpl.h 1609704 
  /trunk/qpid/cpp/src/qpid/client/amqp0_10/ConnectionImpl.cpp 1609704 
  /trunk/qpid/cpp/src/qpid/client/amqp0_10/ReceiverImpl.h 1609704 
  /trunk/qpid/cpp/src/qpid/client/amqp0_10/ReceiverImpl.cpp 1609704 
  /trunk/qpid/cpp/src/qpid/client/amqp0_10/SessionImpl.h 1609704 
  /trunk/qpid/cpp/src/qpid/client/amqp0_10/SessionImpl.cpp 1609704 
  /trunk/qpid/cpp/src/qpid/messaging/ConnectionOptions.h 1609704 
  /trunk/qpid/cpp/src/qpid/messaging/ConnectionOptions.cpp 1609704 
  /trunk/qpid/cpp/src/qpid/messaging/amqp/ConnectionContext.cpp 1609704 

Diff: https://reviews.apache.org/r/23545/diff/


Automated tests passed (well, TestParseTcpIPv6 failed but that fails on trunk as well - already

Manual tests on 0-10 passed as well. On 1.0, they would work (per tcpdump, both max-frame-size
in 'open' performative and incoming-window in 'begin'), but only after QPID-5896 is fixed
:-/ .

(I will post the patch only after QPID-5896 is fixed (and after ACKs from this review, of
course :) )


Pavel Moravec

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