Dispatcher flush is configure in all AEM publish instance multiple times

Question

I am trying to set up the dispatcher flush on publish agent from the AEM Author instance. I have multiple publish instances so for the same, have to define a dispatcher flush against all publish instances. 
 
Suppose, I am having 2 publish instances and accordingly I have set up 2 dispatchers for each publish instance. In the same way, need to set up the dispatcher flush agent to invalidate the cache for each dispatcher.
 
I have set up the dispatcher flush agent from the Author instance from the "Publish to Agent" from the replication section. After activating the flush agent, it shows 2 dispatchers flush agents on both publish instances. So when we publish the page then it sends 4 requests to invalidate the cache. But It should be 2 requests only. 
 
Can anyone suggest how can we resolve this scenario?
 
Thanks

Saravanan_Dharmaraj · Accepted Answer

Can't you disable Dispatcher Flush Agent 2 in Publish Instance 1  and Dispatcher Flush Agent 1 in Publish Instance 2 directly?

Umesh_Thakur · Answer

Ideally if you have 4 publisher and 4 dispatcher then you should configure flush agent on each publisher to respective dispatcher. It should not be from author because it will create Race condition. this way it will be safer for cached content, whichever the publisher get replicated content, will trigger the flush agent for respective dispatcher.

If you have 4 publisher and 2 dispatcher, you can create flush agent from any of the two category publisher.

but I would say don't use from Author.

I am not sure why you are publishing FLush agent from author to publisher?

Hope this helps.

Umesh Thakur

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