Hi Mauricio, 1. This is correct.
2. Queries return the actual data, therefore you see every entry only once. The fact that there are backups is internal and is not related to query results. And actually, I don't think the check you're doing is valid because different queries are not in sync with each other. If you need to make sure that primary and backup is consistent at all times, you can use FULL_SYNC mode: https://apacheignite.readme.io/docs/primary-and-backup-copies#synchronous-and-asynchronous-backups 3. What is your goal here exactly? Do you only try to understand how it works, or listening to backup copies is required by application logic? If the former, I suggest you just put a breakpoint in debug and trace the execution. If the latter, then it's a bit weird and you probably should revisit the approach. -Val -- Sent from: http://apache-ignite-users.70518.x6.nabble.com/