Solution for hash-map with >100M values

• Chronicle Map

  4 2,684 8.4 Java

  Replicate your Key Value Store across your network, with consistency, persistance and performance.

  

I've wrangled data sets in the ~600gb range using nothing but plain old Java and a few beefy boxes. This can all be kept in memory, but you have to go off-heap. You can use Chronicle Map and Chronicle Values to model this data and work with it off-heap in a way that's still very clean and object oriented. 128gb of RAM is cheap these days, whether you're in the cloud or not.

• MapDB

  5 4,832 0.0 Java

  MapDB provides concurrent Maps, Sets and Queues backed by disk storage or off-heap-memory. It is a fast and easy to use embedded Java database engine.

I have had good results with mapdb

• InfluxDB

  www.influxdata.com sponsored

  Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.

  

• Oak

  2 266 0.0 Java

  A Scalable Concurrent Key-Value Map for Big Data Analytics (by yahoo)

  

Consider using an database (e.g. H2 embedded, redis) with an on-heap cache (e.g. Caffeine). Since you say it is a Zipfian distribution, the cache should absorb most of the requests. For an off-heap hashtable, you might try Oak as it is likely a faster implementation.

• java-concurrent-hash-trie-map

  1 150 0.0 Java

  Java port of a concurrent trie hash map implementation from the Scala collections library

• lasher

  1 4 0.0 Java

  Lasher is an embeddable key-value store written in Java.

Do you need to update the data after initial load? If not, then I would suggest using my Paldb fork , otherwise you could try my lasher library. It's in early stage but first results are very promising, I was testing it with 10-100M elements and the performance was similar to java hashmap.

• SmoothieMap

  1 292 0.0 Java

  A gulp of low latency Java

  

Try https://github.com/TimeAndSpaceIO/SmoothieMap

Suggest a related project