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Persistent Structured Graph Storage

Features:

  • Data is modelled by Java classes (see VK test)

  • Directed, undirected, unique, reversible edges (ex. Parent -- Child)

  • Keeping integrity on node/edge removals/additions

  • Pretty fast work with graphs, stored partially on disk

But:

  • Single-threaded access only

  • Copy-on-write modifications only

  • Limits: 4 billions of nodes (32-bit identifiers), 256 TB max size of the database (40-bit offsets)

  • The single node index (lack of indexes per node class)

Implementation

B-tree index: 4096-byte nodes, 12-byte entries, 339 entries in leaf nodes, 253 entries in inner nodes.

VK test

66 millions of Persons, 1,4 billions of Friendships, 7,5 GB on disk.

License

The MIT License (MIT)

Copyright (c) 2013 Roma Leventov http://www.leventov.ru

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

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