Quorum queue replication issue

[Renish Kumar]

According to the documentation "By default a quorum queue will start up to five replicas (Raft group members), one per RabbitMQ node in the cluster." 

But in my case I am setting a cluster of seven nodes using the docker and all the nodes are having replica where as according to doc the following line is there:

"For example, a cluster of three nodes will have three replicas, one on each node. In a cluster of seven nodes, five nodes will have one replica each but two nodes won't host any replicas"

I have attached the screenshot of queue info (quorum_cluster1.png)

Now I tried "x-quorum-initial-group-size" to restrict the quorum queue members and it is working fine.

After that I tried
"x-quorum-cluster-size"   to modify the initial replication factor but it is not working . It is taking all type of values including int and string . The screenshot is attached.

And please clarify is there any difference between x-quorum-initial-group-size and x-quorum-cluster-size.

Doc link referred : https://www.rabbitmq.com/quorum-queues.html#replication-factor

Docker image used : 3.8.2-managment

[Karl Nilsson]

Hi,

`x-quorum-cluster-size` was at some point renamed to `x-quorum-initial-cluster-size` but it seems we missed one part of the docs! We will fix this. There is no `x-quorum-cluster-size` - If you want to modify the cluster after declaration you need to use the `rabbitmq-queues` ctl command. [1]

1. https://www.rabbitmq.com/quorum-queues.html#replica-management

I will also take a look at why the default of 5 isn't being adhered to.

Cheers

Karl

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Karl Nilsson

Pivotal/RabbitMQ

[Renish Kumar]

Thanks Karl  for the information.

It helps a lot.

On Friday, February 28, 2020 at 2:41:16 PM UTC+5:30, Karl Nilsson wrote:

Hi,

`x-quorum-cluster-size` was at some point renamed to `x-quorum-initial-cluster-size` but it seems we missed one part of the docs! We will fix this. There is no `x-quorum-cluster-size` - If you want to modify the cluster after declaration you need to use the `rabbitmq-queues` ctl command. [1]

1. https://www.rabbitmq.com/quorum-queues.html#replica-management

I will also take a look at why the default of 5 isn't being adhered to.

Cheers

Karl

On Fri, 28 Feb 2020 at 08:49, Renish Kumar <rk08...@gmail.com> wrote:

According to the documentation "By default a quorum queue will start up to five replicas (Raft group members), one per RabbitMQ node in the cluster." 

But in my case I am setting a cluster of seven nodes using the docker and all the nodes are having replica where as according to doc the following line is there:

"For example, a cluster of three nodes will have three replicas, one on each node. In a cluster of seven nodes, five nodes will have one replica each but two nodes won't host any replicas"

I have attached the screenshot of queue info (quorum_cluster1.png)

Now I tried "x-quorum-initial-group-size" to restrict the quorum queue members and it is working fine.

After that I tried
"x-quorum-cluster-size"   to modify the initial replication factor but it is not working . It is taking all type of values including int and string . The screenshot is attached.

And please clarify is there any difference between x-quorum-initial-group-size and x-quorum-cluster-size.

Doc link referred : https://www.rabbitmq.com/quorum-queues.html#replication-factor

Docker image used : 3.8.2-managment

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Karl Nilsson

Pivotal/RabbitMQ

[Michael Klishin]

I have updated the docs in [1], will deploy them soon.

Thank you for reporting this typo. Feel free to submit PRs for rabbitmq/rabbitmq-website on GitHub if you find more :)

1. https://github.com/rabbitmq/rabbitmq-website/commit/c6b46d5a3f0ae5c9661932d2117727980fdeaf12

To view this discussion on the web, visit https://groups.google.com/d/msgid/rabbitmq-users/CAAbSEUtbs%2BBLjAv%3D8W4yvvvcVMw3jmREaCOrTYBqHP4%3DTiQgqA%40mail.gmail.com.

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MK

Staff Software Engineer, Pivotal/RabbitMQ

[Renish Kumar]

Thanks Michael

To view this discussion on the web, visit https://groups.google.com/d/msgid/rabbitmq-users/CAGcLz6W2cMbEzuUmvwynwrU0bnnnKNXoVTa8k4NfkLg0MDWGvA%40mail.gmail.com.