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From Adel Boutros <Adelbout...@live.com>
Subject Re: [Qpid Dispatch] Message States on Web Management Console of Qpid Java Broker
Date Thu, 23 Feb 2017 17:52:29 GMT
Hello Ted,


What we tested shows that once credit has been made available to the dispatch router, it remains
even if no more consumers are connected to it. So as Anouchka said any new message sent to
the broker is being taken by the dispatch router which has no consumer. So no other valid
consumer on the broker can consume it.


Our questions:

* Do you confirm this behavior is a bug because the dispatch router should only consume when
a valid peer is connected to it?

* What happens if the broker goes down? Does a consumer connected to the dispatch router still
receives the message as it is currently in the dispatch router's memory?


Regards,

Adel

________________________________
From: Ted Ross <tross@redhat.com>
Sent: Thursday, February 23, 2017 6:09:40 PM
To: users@qpid.apache.org
Subject: Re: [Qpid Dispatch] Message States on Web Management Console of Qpid Java Broker

Actually, the router does not send the messages back to the broker.  It
only sends back dispositions (modified, delivery-failed=true).  The
transfers that you noted as going back to the broker are actually the
broker resending the messages to the router (The <- arrow direction
denotes incoming deliveries from the router's perspective).

-Ted

On 02/23/2017 04:01 PM, Anouchka El Asmar wrote:
> Hello,
>
> As advised, I tried tracing the connection between the router and the
> broker. I worte this simple code that sends and receive a message:
>
> Connection connection = null;
> try {
>     ConnectionFactory connectionFactory = new
> JmsConnectionFactory("amqp://localhost:10501");
>     connection = connectionFactory.createConnection();
>     Session session = connection.createSession(false,
> Session.CLIENT_ACKNOWLEDGE);
>     Queue destination = session.createQueue("queue");
>     MessageProducer producer = session.createProducer(destination);
>     connection.start();
>     TextMessage message = session.createTextMessage("Hello Adoul!");
>
>     producer.send(message);
>     MessageConsumer consumer = session.createConsumer(destination);
>
>     TextMessage received = (TextMessage) consumer.receive();
>
>     consumer.close();
>
> } catch (JMSException e) {
>     e.printStackTrace();
> } finally {
>     if (connection != null)
>         connection.close();
> }
>
>
> All the messages are directly acquired by the dispatch router and when
> I close the connection, it resends them to the broker.
>
> Also, any new message sent direclty to the broker (not through the
> dispatch router) will be directly acquired by the dispatch router.
>
>
> Please find below the trace output,
>
> Regards,
>
> Anouchka
>
>
> Accepted from localhost:58368
>
> [0x7fd3c802d5b0]:  <- SASL
>
> [0x7fd3c802d5b0]:  -> SASL
>
> [0x7fd3c802d5b0]:0 -> @sasl-mechanisms(64)
> [sasl-server-mechanisms=@PN_SYMBOL[:ANONYMOUS]]
>
> [0x7fd3c802d5b0]:0 <- @sasl-init(65) [mechanism=:ANONYMOUS,
> initial-response=b"", hostname="localhost"]
>
> [0x7fd3c802d5b0]:0 -> @sasl-outcome(68) [code=0]
>
> [0x7fd3c802d5b0]:  <- AMQP
>
> [0x7fd3c802d5b0]:0 <- @open(16)
> [container-id="ID:a4e877d7-92e6-44e2-b2be-563ee0c63295:1",
> hostname="localhost", max-frame-size=1048576, channel-max=32767,
> idle-time-out=30000,
> desired-capabilities=@PN_SYMBOL[:"sole-connection-for-container"],
> properties={:product="QpidJMS", :version="0.11.1", :platform="JVM:
> 1.7.0_79, 24.79-b02, Oracle Corporation, OS: Windows 7, 6.1, amd64"}]
>
> [0x7fd3c802d5b0]:  -> AMQP
>
> [0x7fd3c802d5b0]:0 -> @open(16) [container-id="router.10501",
> max-frame-size=16384, channel-max=32767, idle-time-out=8000,
> offered-capabilities=:"ANONYMOUS-RELAY",
> properties={:product="qpid-dispatch-router", :version="0.7.0"}]
>
> [0x7fd3c802d5b0]:0 <- @begin(17) [next-outgoing-id=1, incoming-window=2047,
> outgoing-window=2147483647, handle-max=65535]
>
> [0x7fd3c802d5b0]:0 -> @begin(17) [remote-channel=0, next-outgoing-id=0,
> incoming-window=61, outgoing-window=2147483647]
>
> [0x7fd3c802d5b0]:1 <- @begin(17) [next-outgoing-id=1, incoming-window=2047,
> outgoing-window=2147483647, handle-max=65535]
>
> [0x7fd3c802d5b0]:1 -> @begin(17) [remote-channel=1, next-outgoing-id=0,
> incoming-window=61, outgoing-window=2147483647]
>
> [0x7fd3c802d5b0]:1 <- @attach(18)
> [name="qpid-jms:sender:ID:1e147351-49a8-4f50-a90b-f1b9bf4abd21:1:1:1:adelQueue",
> handle=0, role=false, snd-settle-mode=0, rcv-settle-mode=0,
> source=@source(40)
> [address="ID:1e147351-49a8-4f50-a90b-f1b9bf4abd21:1:1:1", durable=0,
> expiry-policy=:"session-end", timeout=0, dynamic=false,
> outcomes=@PN_SYMBOL[:"amqp:accepted:list", :"amqp:rejected:list"]],
> target=@target(41) [address="adelQueue", durable=0,
> expiry-policy=:"session-end", timeout=0, dynamic=false,
> capabilities=@PN_SYMBOL[:queue]], incomplete-unsettled=false,
> initial-delivery-count=0]
>
> [0x7fd3c802d5b0]:1 -> @attach(18)
> [name="qpid-jms:sender:ID:1e147351-49a8-4f50-a90b-f1b9bf4abd21:1:1:1:adelQueue",
> handle=0, role=true, snd-settle-mode=2, rcv-settle-mode=0,
> source=@source(40)
> [address="ID:1e147351-49a8-4f50-a90b-f1b9bf4abd21:1:1:1", durable=0,
> timeout=0, dynamic=false, outcomes=@PN_SYMBOL[:"amqp:accepted:list",
> :"amqp:rejected:list"]], target=@target(41) [address="adelQueue",
> durable=0, timeout=0, dynamic=false, capabilities=@PN_SYMBOL[:queue]],
> initial-delivery-count=0, max-message-size=0]
>
> [0x7fd3c802d5b0]:1 -> @flow(19) [next-incoming-id=1, incoming-window=61,
> next-outgoing-id=0, outgoing-window=2147483647, handle=0, delivery-count=0,
> link-credit=250, drain=false]
>
> [0x1b80b90]:0 <- (EMPTY FRAME)
>
> [0x1b80b90]:0 <- (EMPTY FRAME)
>
> [0x1b80b90]:0 <- (EMPTY FRAME)
> *Here it sends the message*
> [0x7fd3c802d5b0]:1 <- @transfer(20) [handle=0, delivery-id=0,
> delivery-tag=b"0", message-format=0] (152)
> "\x00Sp\xc0\x02\x01A\x00Sr\xc1)\x04\xa3\x12x-opt-jms-msg-typeQ\x05\xa3\x0ex-opt-jms-destQ\x00\x00Ss\xc0M\x0a\xa1/ID:1e147351-49a8-4f50-a90b-f1b9bf4abd21:1:1:1-1@
> \xa1\x09adelQueue@@@@@@\x83\x00\x00\x01ZkJ\xc7\x86\x00Sw\xa1\x0cHello
> Adoul!"
>
> [0x1b80b90]:1 -> @transfer(20) [handle=0, delivery-id=0,
> delivery-tag=b"\x04\x00\x00\x00\x00\x00\x00\x00", message-format=0,
> settled=false, more=false] (158)
> "\x00Sp\xc0\x02\x01A\x00Sr\xd1\x00\x00\x00,\x00\x00\x00\x04\xa3\x12x-opt-jms-msg-typeQ\x05\xa3\x0ex-opt-jms-destQ\x00\x00Ss\xc0M\x0a\xa1/ID:1e147351-49a8-4f50-a90b-f1b9bf4abd21:1:1:1-1@
> \xa1\x09adelQueue@@@@@@\x83\x00\x00\x01ZkJ\xc7\x86\x00Sw\xa1\x0cHello
> Adoul!"
>
> [0x1b80b90]:1 <- @disposition(21) [role=true, first=0, last=0,
> settled=true, state=@accepted(36) []]
>
> [0x7fd3c802d5b0]:1 -> @flow(19) [next-incoming-id=2, incoming-window=61,
> next-outgoing-id=0, outgoing-window=2147483647, handle=0, delivery-count=1,
> link-credit=250, drain=false]
>
> [0x7fd3c802d5b0]:1 -> @disposition(21) [role=true, first=0, last=0,
> settled=true, state=@accepted(36) []]
>
> [0x7fd3c802d5b0]:1 <- @attach(18)
> [name="qpid-jms:receiver:ID:1e147351-49a8-4f50-a90b-f1b9bf4abd21:1:1:1:adelQueue",
> handle=1, role=true, snd-settle-mode=0, rcv-settle-mode=0,
> source=@source(40) [address="adelQueue", durable=0,
> expiry-policy=:"link-detach", timeout=0, dynamic=false,
> default-outcome=@modified(39) [delivery-failed=true],
> outcomes=@PN_SYMBOL[:"amqp:accepted:list", :"amqp:rejected:list",
> :"amqp:released:list", :"amqp:modified:list"],
> capabilities=@PN_SYMBOL[:queue]], target=@target(41) []]
>
> [0x1b80b90]:0 -> @flow(19) [next-incoming-id=0, incoming-window=15,
> next-outgoing-id=0, outgoing-window=2147483647, handle=0, delivery-count=0,
> link-credit=250, drain=false]
>
> [0x7fd3c802d5b0]:1 -> @attach(18)
> [name="qpid-jms:receiver:ID:1e147351-49a8-4f50-a90b-f1b9bf4abd21:1:1:1:adelQueue",
> handle=1, role=false, snd-settle-mode=2, rcv-settle-mode=0,
> source=@source(40) [address="adelQueue", durable=0,
> expiry-policy=:"link-detach", timeout=0, dynamic=false,
> outcomes=@PN_SYMBOL[:"amqp:accepted:list", :"amqp:rejected:list",
> :"amqp:released:list", :"amqp:modified:list"],
> capabilities=@PN_SYMBOL[:queue]], target=@target(41) [durable=0, timeout=0,
> dynamic=false], initial-delivery-count=0, max-message-size=0]
>
> [0x1b80b90]:0 <- @transfer(20) [handle=0, delivery-id=0,
> delivery-tag=b"\x00\x00\x00\x00\x00\x00\x00\x00", message-format=0] (163)
> "\x00Sp\xc0\x07\x05A@
> @@R\x04\x00Sr\xd1\x00\x00\x00,\x00\x00\x00\x04\xa3\x12x-opt-jms-msg-typeQ\x05\xa3\x0ex-opt-jms-destQ\x00\x00Ss\xc0M\x0a\xa1/ID:44cb79a5-ae8e-40b7-a930-1f55ba6b3c6a:1:1:1-1@
> \xa1\x09adelQueue@@@@@@\x83\x00\x00\x01ZkFN\x01\x00Sw\xa1\x0cHello Adoul!"
>
> [0x1b80b90]:0 <- @transfer(20) [handle=0, delivery-id=1,
> delivery-tag=b"\x00\x00\x00\x00\x00\x00\x00\x01", message-format=0] (163)
> "\x00Sp\xc0\x07\x05A@
> @@R\x02\x00Sr\xd1\x00\x00\x00,\x00\x00\x00\x04\xa3\x12x-opt-jms-msg-typeQ\x05\xa3\x0ex-opt-jms-destQ\x00\x00Ss\xc0M\x0a\xa1/ID:3d7b3b47-f399-4428-867a-11a18d92f08c:1:1:1-1@
> \xa1\x09adelQueue@@@@@@\x83\x00\x00\x01ZkG\x7f\x05\x00Sw\xa1\x0cHello
> Adoul!"
>
> [0x1b80b90]:0 <- @transfer(20) [handle=0, delivery-id=2,
> delivery-tag=b"\x00\x00\x00\x00\x00\x00\x00\x02", message-format=0] (158)
> "\x00Sp\xc0\x02\x01A\x00Sr\xd1\x00\x00\x00,\x00\x00\x00\x04\xa3\x12x-opt-jms-msg-typeQ\x05\xa3\x0ex-opt-jms-destQ\x00\x00Ss\xc0M\x0a\xa1/ID:1e147351-49a8-4f50-a90b-f1b9bf4abd21:1:1:1-1@
> \xa1\x09adelQueue@@@@@@\x83\x00\x00\x01ZkJ\xc7\x86\x00Sw\xa1\x0cHello
> Adoul!"
>
> [0x1b80b90]:0 <- (EMPTY FRAME)
>
> [0x1b80b90]:0 <- (EMPTY FRAME)
>
> [0x1b80b90]:0 <- (EMPTY FRAME)
> *Here it receives it*
> [0x7fd3c802d5b0]:1 <- @flow(19) [next-incoming-id=0, incoming-window=2047,
> next-outgoing-id=2, outgoing-window=2147483647, handle=1, delivery-count=0,
> link-credit=1000]
>
> [0x7fd3c802d5b0]:1 -> @transfer(20) [handle=1, delivery-id=0,
> delivery-tag=b"\x05\x00\x00\x00\x00\x00\x00\x00", message-format=0,
> settled=false, more=false] (163) "\x00Sp\xc0\x07\x05A@
> @@R\x04\x00Sr\xd1\x00\x00\x00,\x00\x00\x00\x04\xa3\x12x-opt-jms-msg-typeQ\x05\xa3\x0ex-opt-jms-destQ\x00\x00Ss\xc0M\x0a\xa1/ID:44cb79a5-ae8e-40b7-a930-1f55ba6b3c6a:1:1:1-1@
> \xa1\x09adelQueue@@@@@@\x83\x00\x00\x01ZkFN\x01\x00Sw\xa1\x0cHello Adoul!"
>
> [0x7fd3c802d5b0]:1 -> @transfer(20) [handle=1, delivery-id=1,
> delivery-tag=b"\x06\x00\x00\x00\x00\x00\x00\x00", message-format=0,
> settled=false, more=false] (163) "\x00Sp\xc0\x07\x05A@
> @@R\x02\x00Sr\xd1\x00\x00\x00,\x00\x00\x00\x04\xa3\x12x-opt-jms-msg-typeQ\x05\xa3\x0ex-opt-jms-destQ\x00\x00Ss\xc0M\x0a\xa1/ID:3d7b3b47-f399-4428-867a-11a18d92f08c:1:1:1-1@
> \xa1\x09adelQueue@@@@@@\x83\x00\x00\x01ZkG\x7f\x05\x00Sw\xa1\x0cHello
> Adoul!"
>
> [0x7fd3c802d5b0]:1 -> @transfer(20) [handle=1, delivery-id=2,
> delivery-tag=b"\x07\x00\x00\x00\x00\x00\x00\x00", message-format=0,
> settled=false, more=false] (158)
> "\x00Sp\xc0\x02\x01A\x00Sr\xd1\x00\x00\x00,\x00\x00\x00\x04\xa3\x12x-opt-jms-msg-typeQ\x05\xa3\x0ex-opt-jms-destQ\x00\x00Ss\xc0M\x0a\xa1/ID:1e147351-49a8-4f50-a90b-f1b9bf4abd21:1:1:1-1@
> \xa1\x09adelQueue@@@@@@\x83\x00\x00\x01ZkJ\xc7\x86\x00Sw\xa1\x0cHello
> Adoul!"
>
> [0x1b80b90]:0 <- (EMPTY FRAME)
>
> [0x7fd3c802d5b0]:0 <- (EMPTY FRAME)
>
> [0x7fd3c802d5b0]:1 <- @detach(22) [handle=1, closed=true]
>
> [0x7fd3c802d5b0]:1 -> @detach(22) [handle=1, closed=true]
> *Then the consumer is closed*
> [0x1b80b90]:0 -> @flow(19) [next-incoming-id=3, incoming-window=15,
> next-outgoing-id=0, outgoing-window=2147483647, handle=0, delivery-count=3,
> link-credit=248, drain=false]
>
> [0x1b80b90]:0 -> @disposition(21) [role=true, first=0, last=0,
> settled=true, state=@modified(39) [delivery-failed=true,
> undeliverable-here=false]]
>
> [0x1b80b90]:0 -> @disposition(21) [role=true, first=1, last=1,
> settled=true, state=@modified(39) [delivery-failed=true,
> undeliverable-here=false]]
>
> [0x1b80b90]:0 -> @disposition(21) [role=true, first=2, last=2,
> settled=true, state=@modified(39) [delivery-failed=true,
> undeliverable-here=false]]
>
> [0x1b80b90]:0 -> @flow(19) [next-incoming-id=3, incoming-window=15,
> next-outgoing-id=0, outgoing-window=2147483647, handle=0, delivery-count=3,
> link-credit=250, drain=false]
> *Then it resends the message back to the broker*
> [0x1b80b90]:0 <- @transfer(20) [handle=0, delivery-id=3,
> delivery-tag=b"\x00\x00\x00\x00\x00\x00\x00\x03", message-format=0] (163)
> "\x00Sp\xc0\x07\x05A@
> @@R\x05\x00Sr\xd1\x00\x00\x00,\x00\x00\x00\x04\xa3\x12x-opt-jms-msg-typeQ\x05\xa3\x0ex-opt-jms-destQ\x00\x00Ss\xc0M\x0a\xa1/ID:44cb79a5-ae8e-40b7-a930-1f55ba6b3c6a:1:1:1-1@
> \xa1\x09adelQueue@@@@@@\x83\x00\x00\x01ZkFN\x01\x00Sw\xa1\x0cHello Adoul!"
>
> [0x1b80b90]:0 <- @transfer(20) [handle=0, delivery-id=4,
> delivery-tag=b"\x00\x00\x00\x00\x00\x00\x00\x04", message-format=0] (163)
> "\x00Sp\xc0\x07\x05A@
> @@R\x03\x00Sr\xd1\x00\x00\x00,\x00\x00\x00\x04\xa3\x12x-opt-jms-msg-typeQ\x05\xa3\x0ex-opt-jms-destQ\x00\x00Ss\xc0M\x0a\xa1/ID:3d7b3b47-f399-4428-867a-11a18d92f08c:1:1:1-1@
> \xa1\x09adelQueue@@@@@@\x83\x00\x00\x01ZkG\x7f\x05\x00Sw\xa1\x0cHello
> Adoul!"
>
> [0x1b80b90]:0 <- @transfer(20) [handle=0, delivery-id=5,
> delivery-tag=b"\x00\x00\x00\x00\x00\x00\x00\x05", message-format=0] (163)
> "\x00Sp\xc0\x07\x05A@
> @@R\x01\x00Sr\xd1\x00\x00\x00,\x00\x00\x00\x04\xa3\x12x-opt-jms-msg-typeQ\x05\xa3\x0ex-opt-jms-destQ\x00\x00Ss\xc0M\x0a\xa1/ID:1e147351-49a8-4f50-a90b-f1b9bf4abd21:1:1:1-1@
> \xa1\x09adelQueue@@@@@@\x83\x00\x00\x01ZkJ\xc7\x86\x00Sw\xa1\x0cHello
> Adoul!"
>
> [0x7fd3c802d5b0]:1 <- @disposition(21) [role=true, first=0, last=0,
> settled=true, state=@modified(39) [delivery-failed=true]]
>
> [0x7fd3c802d5b0]:1 <- @disposition(21) [role=true, first=1, last=1,
> settled=true, state=@released(38) []]
>
> [0x7fd3c802d5b0]:1 <- @disposition(21) [role=true, first=2, last=2,
> settled=true, state=@released(38) []]
>
> [0x7fd3c802d5b0]:0 <- @close(24) []
>
> [0x7fd3c802d5b0]:  <- EOS
>
> [0x7fd3c802d5b0]:0 -> @close(24) []
>
> [0x7fd3c802d5b0]:  -> EOS
>
> Closed localhost:58368
>
> On Wed, Feb 22, 2017 at 7:23 PM, Ted Ross <tross@redhat.com> wrote:
>
>> Hi Anouchka,
>>
>> I assume what is happening in the dispatch router case is that the message
>> does in fact go back to AVAILABLE state, but since the connection between
>> the router and broker is still up (and there is still credit for transfer),
>> the message is immediately re-sent to the router where is waits until there
>> is another consumer to take the delivery.
>>
>> Tracing the connection between the broker and router would confirm (or
>> negate) this theory.
>>
>> -Ted
>>
>>
>> On 02/22/2017 05:09 PM, Anouchka El Asmar wrote:
>>
>>> Hello,
>>>
>>> I am sending messages to a broker with client acknowledge mode and
>>> checking
>>> the different states of the messages. I realized that when a consumer
>>> receives a message, it sets the message state to ACQUIRED and when you
>>> close the consumer without acknowledging it, it releases the message and
>>> sets it back to AVAILABLE. Another consumer can receive it afterwards.
>>>
>>> When I repeat the same scenario with the dispatch router connected to the
>>> broker, the message is always in ACQUIRED state.
>>>
>>> Why don't you have the same behavior in both cases?
>>>
>>> Qpid Dispatch 0.7
>>> Qpid Broker 6.0.4
>>>
>>> Regards,
>>> Anouchka
>>>
>>>
>> ---------------------------------------------------------------------
>> To unsubscribe, e-mail: users-unsubscribe@qpid.apache.org
>> For additional commands, e-mail: users-help@qpid.apache.org
>>
>>
>

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