b9c5af2568
Reviewers: florijan, dgleich, mculinovic Reviewed By: dgleich Subscribers: pullbot Differential Revision: https://phabricator.memgraph.io/D1311
39 lines
1.2 KiB
C++
39 lines
1.2 KiB
C++
#pragma once
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#include <array>
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#include <cstdint>
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namespace durability {
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constexpr std::array<uint8_t, 4> kMagicNumber{{'M', 'G', 's', 'n'}};
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// The current default version of snapshot and WAL encoding / decoding.
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constexpr int64_t kVersion{5};
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// Snapshot format (version 5):
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// 1) Magic number + snapshot version
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// 2) Distributed worker ID
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//
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// The following two entries indicate the starting points for generating new
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// vertex/edge IDs in the DB. They are important when there are vertices/edges
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// that were moved to another worker (in distributed Memgraph).
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// 3) Vertex generator ID
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// 4) Edge generator ID
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//
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// 5) A list of label+property indices.
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//
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// The following two entries are required when recovering from snapshot combined
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// with WAL to determine record visibility.
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// 6) Transactional ID of the snapshooter
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// 7) Transactional snapshot of the snapshooter
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//
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// We must inline edges with nodes because some edges might be stored on other
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// worker (edges are always stored only on the worker of the edge source).
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// 8) Bolt encoded nodes + inlined edges (edge address, other endpoint address
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// and edge type)
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// 9) Bolt encoded edges
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//
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// 10) Snapshot summary (number of nodes, number of edges, hash)
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} // namespace durability
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