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[RocksDB Performance Branch] Introduce MergeContext to Lazily Initialize merge operand list

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Summary: In get operations, merge_operands is only used in few cases. Lazily initialize it can reduce average latency in some cases

Test Plan: make all check

Reviewers: haobo, kailiu, dhruba

Reviewed By: haobo

CC: igor, nkg-, leveldb

Differential Revision: https://reviews.facebook.net/D14415
This commit is contained in:
Siying Dong
2013-12-02 18:34:05 -08:00
parent 90729f8b23
commit ef2211a9ca
10 changed files with 129 additions and 53 deletions
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1
include/rocksdb/merge_operator.h
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@@ -6,6 +6,7 @@
#ifndef STORAGE_ROCKSDB_INCLUDE_MERGE_OPERATOR_H_
#define STORAGE_ROCKSDB_INCLUDE_MERGE_OPERATOR_H_
#include <memory>
#include <string>
#include <deque>
#include "rocksdb/slice.h"