SmoothieMap
Chronicle Map
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SmoothieMap | Chronicle Map | |
---|---|---|
1 | 4 | |
292 | 2,680 | |
1.0% | 0.5% | |
0.0 | 8.5 | |
over 4 years ago | 3 days ago | |
Java | Java | |
- | Apache License 2.0 |
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SmoothieMap
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Solution for hash-map with >100M values
Try https://github.com/TimeAndSpaceIO/SmoothieMap
Chronicle Map
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GC, hands off my data!
I decided to start with an overview of what open-source options are currently available. When it comes to the implementation of the on-heap cache mechanism, the options are numerous – there is well known: guava, ehcache, caffeine and many other solutions. However, when I began researching cache mechanisms offering the possibility of storing data outside GC control, I found out that there are very few solutions left. Out of the popular ones, only Terracotta is supported. It seems that this is a very niche solution and we do not have many options to choose from. In terms of less-known projects, I came across Chronicle-Map, MapDB and OHC. I chose the last one because it was created as part of the Cassandra project, which I had some experience with and was curious about how this component worked:
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Off-heap memory in Java
Chronicle-Map: Chronicle Map is an in-memory, key-value store, designed for low-latency, and/or multi-process applications.
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Solution for hash-map with >100M values
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.
What are some alternatives?
java-concurrent-hash-trie-map - Java port of a concurrent trie hash map implementation from the Scala collections library
MapDB - 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.
Redisson - Redisson - Easy Redis Java client with features of In-Memory Data Grid. Sync/Async/RxJava/Reactive API. Over 50 Redis based Java objects and services: Set, Multimap, SortedSet, Map, List, Queue, Deque, Semaphore, Lock, AtomicLong, Map Reduce, Bloom filter, Spring Cache, Tomcat, Scheduler, JCache API, Hibernate, RPC, local cache ...
lasher - Lasher is an embeddable key-value store written in Java.
JetBrains Xodus - Transactional schema-less embedded database used by JetBrains YouTrack and JetBrains Hub.
Oak - A Scalable Concurrent Key-Value Map for Big Data Analytics
H2 - H2 is an embeddable RDBMS written in Java.
Jedis - Redis Java client
Speedment - Speedment is a Stream ORM Java Toolkit and Runtime
HikariCP - 光 HikariCP・A solid, high-performance, JDBC connection pool at last.
Realm - Realm is a mobile database: a replacement for SQLite & ORMs