package LibLogCabin.Storage.SnapshotMetadata

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* Header for a snapshot file.

• required uint64 last_included_index = 1

  * The snapshot covers log entries in the range [1, lastIncludedIndex].

• required uint64 last_included_term = 4

  * The term of the lastIncludedIndex entry.

• optional uint64 last_cluster_time = 5

  * The cluster time of the lastIncludedIndex entry.

• optional Raft.Protocol.Configuration configuration = 2

  * This contains the latest configuration in the prefix of the log ending with lastIncludedIndex. It'll be present in practice (logs start with configurations in practice) but is marked optional so as to not to bake that assumption in here.

• optional uint64 configuration_index = 3

  * The log index where 'configuration' came from. This is required if 'configuration' is set. (It shouldn't be strictly necessary to persist this, as the configuration could be re-assigned lastIncludedIndex instead; however, this way makes things more obvious.)