[raft/memstore] Add snapshop capability to aux memstore#1530
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This PR is part of a new chain, implementing memstore.
#1525 (Generic raftstore) -> #1527 (Base memstore) -> #1529 (Aux memstore) -> #1530 (Snapshots) -> #1534 (Rid memstore) -> #1535 (Correct use of now) -> #1539 (Checkpoint) -> #1542 (Scd memstore) -> #1528 (First PR with raft using memstore)
It add
GetSnapshot/RestoreFromSnapshotcapability to memstore + aux implementation, to be used in raftstore for snapshots.Encoding is done using
gob(that should be faster than json for lot of data) +statehas been moved to a specific struct for direct encoding / decoding.Version has been added to the snapshot. Incompatible changes that require "migration" of data will be handled there in the future, based on version's field.