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1. Users must have the ability to create a snapshot of persisted user data (in-memory is out of the scope).
2. Users must have the ability to create a snapshot from the cluster under the load without cluster deactivation.
3. The snapshot process must not block for a long time any of the user transactions (short-time blocks are acceptable).
4. The snapshot process must allow creating a data snapshot on each node and transfer it to any of the remote nodes for internal cluster needs.
5. The created snapshot at the cluster-level must be fully consistent from cluster-wide terms, there should not be any incomplete transactions inside.
6. The snapshot of each node must be consistent – cache partitions, binary meta, etc. must not have unnecessary changes.

Snapshot

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overview

With respect to the cluster-wide snapshot operation, the process of creating a copy of user data can be split into the following high-level steps:

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