Wildfly 10: Some questions related to configuration of activemq messaging

[wwang2016]

Hi,

I am trying to clean up / optimize the configurations for standalone-full-ha.xml that is used to support HA for messaging.

The following are questions that I am not sure of after consulting with the following link

Wildfly Model Reference

I have a configuration to set up colocated backup server

(1) address-setting

Attribute: "redistribution-delay" means How long to wait when the last consumer is closed on a queue.

The unit of measurement is milliseconds. However, the default value of -1. What does that mean?

what is a reasonable value?

(2) discovery-group

Attribute: "refresh-timeout" means Period the discovery group waits after receiving the last broadcast from a particular server before removing that server's connector pair entry from its list.

The default value is 10000 milliseconds. Is that a reasonable value? Is a 1000 milliseconds a better value?

(3) pooled-connection-factory

Attribute: "reconnect-attempts" By default, a pooled connection factory will try to reconnect infinitely to the messaging server(s)

The default value is -1.

what is a reasonable value?

(4) connection-factory: name=RemoteConnectionFactory (out-of-box definition)

Attribute: "reconnect-attempts" means the reconnect attempts

The default value is 0 while the out-of-box value is set to -1

What does it mean by zero or -1?

(5) security

The default value is true

In a scenario where I have a colocated backup server configuration, I see sample configuration with the following setting

<security enabled="false"/>

Is that necessary?

(6) security-setting

The default value of the following is false:

delete-non-durable-queue

delete-durable-queue

create-non-durable-queue

create-durable-queue

send

consume

manage

However, the out-of-box configuration set the following to be true

delete-non-durable-queue

create-non-durable-queue

send

consume

can we set the value to be true for all the attributes?

What are the concerns in setting up the values?

Thanks,

Wayne

Message was edited by: Wayne Wang

[jbertram]

In general I would encourage you to read the Artemis documentation.  Lots of the questions you have are answered there.

Attribute: "redistribution-delay" means How long to wait when the last consumer is closed on a queue.

The unit of measurement is milliseconds. However, the default value of -1. What does that mean?

what is a reasonable value?

As the documentation states:

...redistribution-delay defines the delay in milliseconds after the last consumer is closed on a queue before redistributing messages from that queue to other nodes of the cluster which do have matching consumers. A delay of zero means the messages will be immediately redistributed. A value of -1 signifies that messages will never be redistributed.

A "reasonable" value is dependent on your use-case.  There is no single "reasonable" value which is why this is configurable.

Attribute: "refresh-timeout" means Period the discovery group waits after receiving the last broadcast from a particular server before removing that server's connector pair entry from its list.

The default value is 10000 milliseconds. Is that a reasonable value? Is a 1000 milliseconds a better value?

As I noted before, "reasonable" is really dependent on your use-case.  In this particular case it also depends on how often your broadcast-group is transmitting information.  If your broadcast-group has a broadcast-period of 5000 and your discovery-group has a refresh-timeout of 1000 then your cluster may never form properly because the timeout will consistently elapse.

(3) pooled-connection-factory

Attribute: "reconnect-attempts" By default, a pooled connection factory will try to reconnect infinitely to the messaging server(s)

The default value is -1.

what is a reasonable value?

It depends on your use-case.  If you want infinite reconnect attempts then -1 is reasonable.  If you don't, then it's not.

(4) connection-factory: name=RemoteConnectionFactory (out-of-box definition)

Attribute: "reconnect-attempts" means the reconnect attempts

The default value is 0 while the out-of-box value is set to -1

What does it mean by zero or -1?

Zero means it won't attempt to reconnect.  Negative one means it will attempt to reconnect indefinitely.  Again, this is covered in the Artemis documentation.

[wwang2016]

Thanks a lot!

Artemis document is the best complementary document of the Wildfly10 model reference

Wayne