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* Extend Tlog persistentStorage to persist encryption state
Description
diff-3: Address review comment.
diff-2: Extend ClusterController endpoints to allow query
cluster's encryptionAtRest status
Update Tlog recovery to ensure on-disk encryption
status matches with cluster's cstate persisted
encryptionAtRest
diff-1: Store encryptionAtRestMode state in Coordinators
Major changes proposed are:
1. Extend TLog persistentStorage to persist encryption state
2. Encryption state persisted is derived from corresponding
db-config and relevant SERVER_KNOBS. In near future, knobs
shall be removed.
3. On TLog startup, the persisted encryption state is compared
against cluster configuration, if mismatch, the TLog is killed
and not allowed to rejoin the cluster.
Testing
devRunCorrectness - 100K