Consumers are not able to consume messages from slave broker once it become live in EAP 7.2 with 3 master-slave pair collocated setup.

Issue

Phase-1:
1. Load 100 messages on Node-1 with java client
2. Watch for 100 messages on Node-1 and bring it down
3. Watch for backup up status on Node-2 and query backup. Backup broker shows up 100 messages
4. Point the Consumer (java client) to Node-2 and try to consume
5. Zero messages were returned

Logs captured till here Phase-1 folder

Phase-2:
1. Restart Node-1
2. Watch for 100 messages appears on Node-1 queue and backup on Node-2 shows zero / not active anymore at all (Node-1 failback)
3. Point the Consumer (java client) to Node-2 and try to consume, return all 100 messages successfully
Logs captured again at this point Phase-2 logs.

This is exactly the case with my application as well.