Purified?

New release from MapDB: the Java database for Java devs

Lucy Carey
Rocket

A less buggy version of the 100% Java-fied database is now ready for download, but watch out for pesky asynchronous writes.

Bespoke Java developer database MapDB, which is open sourced under the Apache license, reached a new milestone yesterday with its second official release. There’s been some bug fixing, including retooling of race condition in asynchronous writes.

Because  asyncWriteEnable() had race condition in record preallocation, there’s a chance that users might experience data loss. The feature turned out to be too complicated to fix, so it was removed altogether, which could result in some minor “performance regression.”

Moreover, some formerly protected methods are now public and allow external access, and the DB now now exposes Name Catalog via public methods. In addition, external libraries can now manipulate catalog content. For the full and intricate list of what’s new, check out the official changelog.

If you’re a Java dev who has yet to sample MapDB - touted in certain circles as the Java storage engine of the future – then you’ll find it all pretty familiar, due to its intuitive and adaptable API.

Furthermore, MapDB utilizes some of the advanced Java Collections variants, such as ConcurrentNavigableMap, allowing you to travel beyond simple key-value semantics and find values near a key. The database also offers a high degree of agility, allowing you a satisfying level of control over a host of features within your DB, running the breadth from exposed schema to internal structures.

All of this was primarily developed by Jan Kotek, who has had a hand in a range of JDBM (Java Database Manager) projects. And it’s his experience with the JDBM, which was itself was a Java port of UNIX DBM and GDBM, C-language databases that support hash-based key-value stores on disk, that he takes as his inspiration for MapDB. Jan now works full time developing his creation at dbShards vendors CodeFutures, who were enthusiastic early adopters of the project. His mission? Naturally, to make MapDB the leading Java database in the world.

If you’d like to take a swig of Jan’s tasty Java-laced Kool Aid, check out this MapDB intro from the man himself:

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