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a09ee1069d
Summary: Added an option (max_successive_merges) that can be used to specify the maximum number of successive merge operations on a key in the memtable. This can be used to improve performance of the "get" operation. If many successive merge operations are performed on a key, the performance of "get" operations on the key deteriorates, as the value has to be computed for each "get" operation by applying all the successive merge operations. FB Task ID: #3428853 Test Plan: make all check db_bench --benchmarks=readrandommergerandom counter_stress_test Reviewers: haobo, vamsi, dhruba, sdong Reviewed By: haobo CC: zshao Differential Revision: https://reviews.facebook.net/D14991