Embedded Java key-value storage

Question

I'm looking for a persistent key-value storage to use in my application. Specifically:

It must be embeddable into Java application. Pure Java solution would be the best.
Data must be persisted on disk, in-memory-only storage is not an option. Memory footprint size is important and overall size of key-value map can be quite large. Ideally I'd like to have some kind of LRU cache implemented over the storage.
Both keys & values are strings (don't need to support Java object serialization, etc).
Concurrent reads/writes are important.

What would be the best option in such case?

possible duplicate of [key-value store suggestion](http://stackoverflow.com/questions/6639080/key-value-store-suggestion) — Basil Bourque, Jul 23 '15 at 08:57
There is another way if it helps, use TayzGrid as a [java key value store](http://blogs.tayzgrid.com/using-an-in-memory-key-value-store-to-scale-java-apps/) and dump the cache data periodically — Basit Anwer, Sep 08 '15 at 12:42

score 5 · Answer 1 · edited May 23 '17 at 12:34

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OrientDB (SO info page) seems to fit the bill.

The documentation is occasionally a bit lacking, but I belive it fulfills the criteria you are listing.

edited May 23 '17 at 12:34

Community

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answered Mar 04 '13 at 10:07

Henrik Aasted Sørensen

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score 3 · Answer 2 · answered Mar 04 '13 at 09:36

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I do not know it is best or not but Hazelcast has these options. You can store your data on memory with a backup on disk. There is an example on hazelcast.

answered Mar 04 '13 at 09:36

bhdrkn

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score 3 · Answer 3 · edited Jun 20 '20 at 09:12

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I have used Voldemort when we had to replace normal HashMap when large data had to be supported. Performance was really great.

value = store.get(key)

store.put(key, value)

store.delete(key)

In next oppurtunity to try a key-value store, I will in all probability try out Redis

edited Jun 20 '20 at 09:12

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answered Mar 04 '13 at 09:43

rajesh

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Calabacin · Answer 4 · 2016-04-15T11:13:36.713

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I would use SQLite (SQLite). It is a relational-database like file storage, that will allow you to store key-values and any other thing you may need. It has a very low footprint and is quite fast.

It is very commonly used on Android applications for all these reasons.

edited Apr 15 '16 at 11:13

answered Mar 04 '13 at 09:35

Calabacin

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Embedded Java key-value storage

4 Answers4