How do activemq wildcards work?

Question

I am using ActiveMQ 5.8 with wildcard users configured on a camel route.

I use ActiveMQ default configuration, so I have default values below

prefetch = 1
dispatch policy= Round Robin

Now I am running a consumer jvm with 5 consumers each for two queues. both queues have the same message type and the same number of messages.

Consumers do nothing but print a message (so don't block db or a slow consumer problem)

EDIT I set preFetch to 1 for each queue

What I am observing is one of the lines that is depleting faster than others.

What I expect is tantamount to discharging the queue at the same pace as the load balance.

One amazing observation Although the activemq webconsole shows 5 consumers for each of these queues

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When I debug my consumer, I see only 5 threads / consumers from the camel stream for the * .processQueue wildcard queue enter image description here

What will cause this behavior? How am I sure that the whole line will flow at an equal pace?

Does anyone have any experience with sharing custom mailing rules or overriding activemq's default values?

+4

blob Aug 18 '14 at 17:49

2 answers

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0

blob · Accepted Answer · 2014-09-14T18:53:55+0000

I managed to find a link to this behavior

The distribution of messages in the case of users of the wildcard queue is random.

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prefetch = number of wildcard consumers