fork of https://github.com/oxigraph/rocksdb and https://github.com/facebook/rocksdb for nextgraph and oxigraph

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Islam AbdelRahman 50a969131f CacheActivityLogger, component to log cache activity into a file ... Summary: Simple component that will add a new entry in a log file every time we lookup/insert a key in SimCache. API: ``` SimCache::StartActivityLogging(<file_name>, <env>, <optional_max_size>) SimCache::StopActivityLogging() ``` Sending for review, Still need to add more comments. I was thinking about a better approach, but I ended up deciding I will use a mutex to sync the writes to the file, since this feature should not be heavily used and only used to collect info that will be analyzed offline. I think it's okay to hold the mutex every time we lookup/add to the SimCache. Closes https://github.com/facebook/rocksdb/pull/2295 Differential Revision: D5063826 Pulled By: IslamAbdelRahman fbshipit-source-id: f3b5daed8b201987c9a071146ddd5c5740a2dd8c		7 years ago
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sim_cache.cc	CacheActivityLogger, component to log cache activity into a file	7 years ago
sim_cache_test.cc	CacheActivityLogger, component to log cache activity into a file	7 years ago