Ejabberd xmpp pubsub blocking calls timeout very slow

have pubsub related problem on @ejabberd My Cluster Configuration Is 2 Servers 16 GB + 4 Core each on AWS

My pubsub config is as follows 4 Pub Sub Nodes ( flat type )

Our concurrent pubsub load is as follows 20000+ Concurrent users connecting and subscribing on those 4 nodes.

And the problem is as follows Each pubsub blocking call takes infinite time to complete With smackexception$noresponseexception

I also tried from websocket and it happens to be having very long response time for pubsub subscribe or publish calls. The same issue arises when we try to create pubsub nodes using xmpp client.

MUC works fine. What could be wrong ? Any help ? How to trace this ?

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