Hi Gordon/Rob,
        I tried with asynchronous approach by setting the LinkSourceDurablity 
to MixedMode (2) and LinkSenderSettle  to MixedMode (2) and also setting the 
Message Property  SendSettled to true.  A sender sending messages and receiver 
sending messages.  After sometime the sending application errors with error 
"Maximum Depth Exceeded". 
Also the consuming application hangs after it errors out on Sender. I have 
restart the receiver process to consume rest of the messages. Is there anyother 
configuration that I am missing 

Also when creating the queue,  I cannot set the limit policy to flow-to-disk 

Sending message:link detached, reason: *Error{Condition: 
amqp:precondition-failed, Description: resource-limit-exceeded: Maximum depth 
exceeded on odimevent: current=[count: 204400, size: 104857200], max=[size: 
104857600] 
(/build/qpid-cpp-VLEObV/qpid-cpp-1.39.0/src/qpid/broker/Queue.cpp:1658), Info: 
map[]} exit status 1


And if I try to config limit policy as to flow-to-disk,  I get invalid choice. 
Do I need configure anything else to enable that configuration.

qpid-config: error: option --limit-policy: invalid choice: 'flow-to-disk' 
(choose from 'none', 'reject', 'ring', 'ring-strict')

Thanks & Regards,
Nancy

-----Original Message-----
From: Rob Godfrey [mailto:rob.j.godf...@gmail.com] 
Sent: Wednesday, May 19, 2021 8:55 PM
To: users@qpid.apache.org
Subject: Re: Message Persistence in Qpid Broker C++ (1.39)

On Wed, 19 May 2021 at 17:04, Gordon Sim <g...@redhat.com> wrote:

> On Wed, May 19, 2021 at 3:34 PM Namitha, Nancy <nami...@hpe.com> wrote:
> > Is Broker - J optimized for the below mentioned scenario.
>
> I believe the java broker will indeed perform better for synchronous 
> publish. Best thing is to run a quick test though.
>

Broker-J does not rely on a flush timer, instead simply combining all DB 
interactions that are running concurrently into a single write... So, 
theoretically, for this particular case you shouldn't see the same sort of 
latency... but as Gordon says you should really test with something that best 
represents your actual expected workload.  In general if you care about 
performance then sending individual messages synchronously is not a good choice.

-- Rob

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