Database engine for Java
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CavalliumDB Engine

A very simple wrapper for RocksDB and Lucene, with gRPC and direct connections.

This is not a database, but only a wrapper for Lucene Core and RocksDB, with a bit of abstraction.

Features

RocksDB Key-Value NoSQL database engine

  • Snapshots
  • Multi-column databases
  • WAL and corruption recovery strategies
  • Multiple data types:
    • Bytes (Singleton)
    • Maps of bytes (Dictionary)
    • Maps of maps of bytes (Deep dictionary)
    • Sets of bytes (Dictionary without values)
    • Maps of sets of bytes (Deep dictionary without values)

Apache Lucene Core indexing library

  • Documents structure
  • Sorting
    • Ascending and descending
    • Numeric or non-numeric
  • Searching
    • Nested search terms
    • Combined search terms
    • Fuzzy text search
    • Coordinates, integers, longs, strings, text
  • Indicization and analysis
    • N-gram
    • Edge N-gram
    • English words
    • Stemming
    • Stopwords removal
  • Results filtering
  • Snapshots

F.A.Q.

Why is it so difficult?

This is not a DMBS.

This is an engine on which a DBMS can be built upon. For this reason it's very difficult to use it directly without using it through abstraction layers.

Can I use objects in the database?

Yes you must serialize/deserialize them using a library of your choice.

Why there is a snapshot function for each database part?

Since RocksDB and lucene indices are different instances, every instance has its own snapshot function.

To have a single snapshot you must implement it as a collection of sub-snapshots in your DBMS.

Is CavalliumDB Engine suitable for your project?

No. This engine is largely undocumented, and it doesn't provide extensive tests on its methods.