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I am looking for a JVM library implementing ConcurrentHashMap to store large map in local memory. Expected to have 20,000,000 items in this map with overall size of 2-3 Gb. No need to distribute data set across hosts.

Load mostly reads with a few writes. Infrequient writes are snapshot updates when whole map content should be replaced with new data.

Would prefer a library with a minimum of dependencies to simplify integration. Would be nice to re-package the library with jarjar for re-distirbution inside my own package.

So far I encountered * ChronicleMap * Apache Ignite * Hazelcast

Could you please recommend which one of those fit my use case better?

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