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由 Mayank Agarwal 提交于
Expand KeyMayExist to return the proper value if it can be found in memory and also check block_cache Summary: Removed KeyMayExistImpl because KeyMayExist demanded Get like semantics now. Removed no_io from memtable and imm because we need the proper value now and shouldn't just stop when we see Merge in memtable. Added checks to block_cache. Updated documentation and unit-test Test Plan: make all check;db_stress for 1 hour Reviewers: dhruba, haobo Reviewed By: dhruba CC: leveldb Differential Revision: https://reviews.facebook.net/D11853
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