Who is using MapDB

Following companies are using MapDB:

  • Twitter
  • Linkedin
  • Credit Suisse
  • Deutsche Bank
  • HP Labs

Here is what users wrote about MapDB:


XAP (memory data grid) is using MapDB, an embedded database engine which provides concurrent Maps, Sets and Queues backed by disk storage or off-heap memory. When writing an object to the space, its indexed data maintained on-heap and it’s raw data is stored on off-heap.

XAP manual


We have successfully finished our consultation session with Jan Kotek for MapDB integration. With Jan’s help we’ve successfully ran our mapping task using mapDB after weeks of failing to do this using any other method (and we’ve tried many).

It was my first use of MapDB, and for the first time I learned about the big limitations of the java collections and since using MongoDB was also not efficient due to the huge amount of IO required. MapDB was the perfect solution for us.

It was a great pleasure to work with Jan, he is an amazing professional

Tom B., ModusP


MapDB has been a fantastic resource, allowing us to transparently move traditionally a SQL-backed application into main memory for performance. It’s easy to use, and the examples are quite good. It definitely follows the principle of least surprise. It actually surprised me that things “just worked”, and required very little effort to get going.

I replaced a 6-table system, relations, secondary indexes, and all into MapDB. It was quite simple and blazing fast.

Michael Rose, Senior Platform Engineer, FullContact

OpenStreet map import

MapDB is great product. Today I finished importing file planet.osm.pbf from OpenStreetMap project that is ~27GB huge. All data after import with spatial index and simple search index by names took only ~60GB. The best thing is that it only took 3.5 hours!!!!

Configuration: pre MapDB 2.0 alpha 1, Java 8 x86_64, Xmx: ~5GB, SSD disk, CPU up to 4 cores

This is only first run with these data but it looks very promising. It’s a shame that now I have to work on another project. So I can continue with MapDB and OSM data on spare time :-(. Later on I will test latest MapDB 2.0.

Thank you very much



First, thanks for all your work on MapDB. It is becoming an essential part of our work on the OpenTripPlanner project and our other geospatial/transport analysis work. We are currently modifying OpenTripPlanner to use MapDB for its street and public transport schedule import step.

Andrew Byrd


I am glad to have discovered this ultra-fast Java Map implementation that scales linearly, is not limited by JVM memory, and persists to disk as you write to it. For an embedded key/value storage solution, MapDB tops the list for being so efficient and easy to use. It has been used as the default URL storage mechanism for Norconex Collectors for a few years now.

Pascal Essiembre - President at Norconex


Our app uses MapDB as a key-value store. We originally started with JDBM back in 2009 and made the port to MapDB in 2015.

The main reason I chose MapDB is because I dislike the impedance mismatch of trying to force a Java object graph into a relational database. Not having any particular need for a relational database, I decided a key-value store storing Java objects is a nicer fit. MapDB appears very performant under highly concurrent loads. I like how the dependencies are basically zero, and the code itself is very concise, which helps when you are trying to work out how it works.

Our application is downloadable software, and MapDB is used to write to the user’s local hard drive. We have around 500,000 installations, so we know that MapDB works well on a wide variety of OSes and hardware, from desktops to NASes and music servers.

Dan Gravell - bliss


MapDB works really great as a underlying key-value store for quite a big spatial dataset, both for import from OpenStreetMap and for querying/display.

I’m still impressed how small difference is between memoryDirect DB and disk (SSD) based - in my scenarios they are so close to each other!

Łukasz Kolek - geostreaming