need distributed key-value lookup system


i need proceed key-value lookups opposing (potentially) hundreds gb data. ideally something formed distributed hashtable, works simply java. should fault-tolerant, open source.



the store should persistent, nonetheless ideally cache information memory speed things up.



it should means support indicate reads writes churned machines (reads 100x some-more common though). fundamentally purpose discerning initial lookup user metadata web-service.



can anyone advise anything?



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