THIS IS A TEST INSTANCE. ALL YOUR CHANGES WILL BE LOST!!!!

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Only PME required for in-memory snapshots. We can set write listener during PME because no concurrent transactions allowed.

See:

PartitionsExchangeAware#onDoneBeforeTopologyUnlock
IgniteSnapshotManager#onDoneBeforeTopologyUnlock
SnapshotFutureTask#start

2. Persistent pages contains CRC to make sure data integrity while storing on disk.

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