I applied patch PATCH-3272 to AMQ 7.11.6 to all 4 brokers (primary master-slave, mirrored master-slave , non-shared storage), tested the mirroring function.
setting:
Heap size 12G
Global Max size 3G (also tested using 6GB, same result)

Observations of the test:
1. Mirror queue is not getting filled up as observed earlier(7.11.6), however we have observed message count discrepancies between Primary Date center master node and Mirrored master node. Attached screenshot for the same message-discrepancies.png and logs of mirrored master node.

2. While running performing load test, the primary slave throws OOM after some point which leads master unresponsive. Once the primary master is unresponsive, the load redirects to mirrored brokers. Within few minutes, the mirrored slave throws OOM too.

3. When testing without the mirroring function, the Primary master and slave node running well without any OOM.

From the current analysis, the Primay & Mirror side slave throws OOM, both these heapdumps are occupied nearly by the replication of the journal and paging messages etc. Pls check the screenshot, assume there is a memory leak