(RabbitMQ Client C#) Unable to subscribe to Queue 2, After Dead Letter in Queue 1 routed to Queue 2

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eric tech

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Jun 14, 2019, 1:32:34 AM6/14/19
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Hi, Good Day

I using CFX library as publisher to publish a message to Exchange "TestQueue1" which route message to Queue 1.
By using max-length to make queue head drop as dead letter.
Dead Letter will route to Exchange "GSF.TEST" then route to Queue 2.

Then having a Rabbit Client (C#) to subscribe to Queue 2.
It throw ex error :
"The AMQP operation was interrupted: AMQP close-reason, initiated by Peer, code=541, text=\"INTERNAL_ERROR\", classId=0, methodId=0, cause="

I simulate the error few times, below are message look like using RabbitMQ management (Before and After dead letter routing)
Can read the message using RabbitMQ management, however, failed to subscribe to dequeue the message using RabbitMQ client.

Before dead letter routing:
before.png


After dead letter routing:
after.png

Please help advice, if anyone encounter same issue or having solution for this. Thanks !

Karl Nilsson

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Jun 14, 2019, 4:32:26 AM6/14/19
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Do the RabbitMQ server logs have anything around the same time?

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Karl Nilsson

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eric tech

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Jun 17, 2019, 4:10:48 AM6/17/19
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Hi Karl,

It do not have any error log.
****btw, my logging level set as debug


On Friday, June 14, 2019 at 4:32:26 PM UTC+8, Karl Nilsson wrote:
Do the RabbitMQ server logs have anything around the same time?

On Fri, 14 Jun 2019 at 06:32, eric tech <tech....@gmail.com> wrote:
Hi, Good Day

I using CFX library as publisher to publish a message to Exchange "TestQueue1" which route message to Queue 1.
By using max-length to make queue head drop as dead letter.
Dead Letter will route to Exchange "GSF.TEST" then route to Queue 2.

Then having a Rabbit Client (C#) to subscribe to Queue 2.
It throw ex error :
"The AMQP operation was interrupted: AMQP close-reason, initiated by Peer, code=541, text=\"INTERNAL_ERROR\", classId=0, methodId=0, cause="

I simulate the error few times, below are message look like using RabbitMQ management (Before and After dead letter routing)
Can read the message using RabbitMQ management, however, failed to subscribe to dequeue the message using RabbitMQ client.

Before dead letter routing:
before.png


After dead letter routing:
after.png

Please help advice, if anyone encounter same issue or having solution for this. Thanks !

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Karl Nilsson

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Karl Nilsson

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Jun 17, 2019, 4:30:25 AM6/17/19
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Can you post a minimal code sample that reproduces the error?

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Karl Nilsson

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eric tech

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Jun 17, 2019, 11:03:32 PM6/17/19
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Hi Karl,

Attach are the simplified code, WinForm (.Net 4.6.2)

NuGet:
- RabbitMQ.Client
- CFX.CFXSDK

Attach images are the steps and setup require. Thanks

Resource Setup.JPG

steps.JPG






On Monday, June 17, 2019 at 4:30:25 PM UTC+8, Karl Nilsson wrote:
Can you post a minimal code sample that reproduces the error?



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Karl Nilsson

Pivotal/RabbitMQ
Form3.cs

eric tech

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Jun 17, 2019, 11:05:06 PM6/17/19
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repost images, Images not showing properly.
Resource Setup.JPG
steps.JPG

eric tech

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Jun 18, 2019, 1:29:03 AM6/18/19
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Hi Karl

I found that the root cause, when first publish to "/exchange/TestQueue1" without a routing key, it will cause error.
If publish with routing key it will not cause error.

Karl Nilsson

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Jun 18, 2019, 4:05:56 AM6/18/19
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Maybe CFX requires that meta data to be there? I've never used no heard of CFX so can't really say for sure.

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Karl Nilsson

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eric tech

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Jun 18, 2019, 4:34:39 AM6/18/19
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Hi Karl,

In the consumer side using RabbitMQ client, in my POV kinda suspect probably there are bug on that.
Firstly, there are no routing key, but after dead letter, routing key are assigned. Probably, it try to interpret routing key and get null.

Anyway, thanks for your help. 



On Tuesday, June 18, 2019 at 4:05:56 PM UTC+8, Karl Nilsson wrote:
Maybe CFX requires that meta data to be there? I've never used no heard of CFX so can't really say for sure.



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Karl Nilsson

Pivotal/RabbitMQ

Karl Nilsson

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Jun 18, 2019, 4:48:00 AM6/18/19
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If you can make a console application repro using only the standard .NET client that would be helpful. I can't compile winforms applications.

Cheers

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Karl Nilsson

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eric tech

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Jun 18, 2019, 8:19:04 PM6/18/19
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Hi Karl,

I do not share you the entire project, but its enough to reproduce the application.

You may create WinForm application then copy the code into Form1 code behind (Please take note, the code is using Form3)

Should able to build an Exe program.


On Tuesday, June 18, 2019 at 4:48:00 PM UTC+8, Karl Nilsson wrote:
If you can make a console application repro using only the standard .NET client that would be helpful. I can't compile winforms applications.

Cheers



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Karl Nilsson

Pivotal/RabbitMQ

eric tech

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Jun 18, 2019, 9:30:23 PM6/18/19
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Hi Karl,

I tried to publish messages using RabbitMQ management (means not using C# program and CFX).
When using C# RabbitMQ client to dequeue message also having the same error.
Seem like, missing routing key is the reason causing the error.


On Tuesday, June 18, 2019 at 4:48:00 PM UTC+8, Karl Nilsson wrote:
If you can make a console application repro using only the standard .NET client that would be helpful. I can't compile winforms applications.

Cheers



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Karl Nilsson

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