feat(storers): Add a new NutsMemcached storage backend built on NutsDB #452
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In this commit NutsMemcached behave just like Nuts.
In this commit cache values are moved to memcached and only keys are kept in Nuts.
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Add a new storage backend:
NutsMemcached. It is composed of both NutsDB and Memcached (i.e., two layers storage).Layer 1:
Keys+Headersalone are stored in NutsDB in RAM to take advantage of its fast prefix search.Layer 2: Keys+Values are stored in Memcached to take advantage of its advanced RAM+disk eviction system and hard limits on RAM and disk usage.
Note: since NutsDB has no preemptive eviction system, keys would remain until the end of their TTL, while key+values stored in Memcached could be evicted. Question: could we bring back
HintBPTSparseIdxModewhich was very efficient for caching many keys.Note: prefix search is not (easily?) supported on Memcached alone.
References
HintBPTSparseIdxModewas removed in this PR: refactor: Remove the 3rd mode nutsdb/nutsdb#456, last release with the "3rd mode" is v0.14.0.