memgraph/src/durability/version.hpp

#pragma once

#include <array>
#include <cstdint>

namespace durability {

constexpr std::array<uint8_t, 4> kMagicNumber{{'M', 'G', 's', 'n'}};

// The current default version of snapshot and WAL encoding / decoding.
constexpr int64_t kVersion{5};

// Snapshot format (version 5):
// 1) Magic number + snapshot version
// 2) Distributed worker ID
//
// The following two entries indicate the starting points for generating new
// vertex/edge IDs in the DB. They are important when there are vertices/edges
// that were moved to another worker (in distributed Memgraph).
// 3) Vertex generator ID
// 4) Edge generator ID
//
// 5) A list of label+property indices.
//
// The following two entries are required when recovering from snapshot combined
// with WAL to determine record visibility.
// 6) Transactional ID of the snapshooter
// 7) Transactional snapshot of the snapshooter
//
// We must inline edges with nodes because some edges might be stored on other
// worker (edges are always stored only on the worker of the edge source).
// 8) Bolt encoded nodes + inlined edges (edge address, other endpoint address
//    and edge type)
// 9) Bolt encoded edges
//
// 10) Snapshot summary (number of nodes, number of edges, hash)

}  // namespace durability