Hi @Piyush_Poply ,
The REPLAY_TOPICs queue is about keeping track of the subscriptions that you want to be tracked in the replay log. This was introduced in a recent broker release. Prior to that, all guaranteed messages would be tracked in the replay log. This feature allows you to only replay topics that are “important” rather than filling the replay log with messages you will not need to replay. Replay depends on disconnecting consumer flows as otherwise you would get into race conditions and unpredictable results. The SEMP endpoints will also cause your flows to unbind/rebind. The reason API-initiated replay is limited to exclusive queues is because a single consumer does not have the right/ability to unbind flows in other consumer clients that might/would be connected to the non-exclusive queue. From SEMP or Broker Manager UI, this is a management user and does have the right to do so. Andrew