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In recent year, the write-heavy applications is more and more prevalent. Howto efficiently handle this sort of workload is one of intensive researchdirection in the field of database system. The overhead caused by writeoperation is mainly issued by two reasons: 1) the hardware level, i.e., the IOcost caused by logging. We can't remove this cost in short period 2) thedual-copy software architecture and serial replay. The born of log as databasearchitecture is originated to overcome the software defect. But existingsystems treating log as database either are built on top of specialinfrastructure such as infiniband or NVRam (Non-Volatile Random access memory)which is far from widely available or are constructed with the help of othersystem such as Dynamo which is lack of flexibility. In this paper we build onlywrite-once key-value system called LogStore from scratch to support our instantmessenger business. The key features of LogStore include: 1) a single threadper partition executing mode, which eliminates the concurrency overhead; 2) logas database to enable write-once feature and freshness on the standby. Weachieve high availability by embedding replication protocol other thandependent on other infrastructure; 3) fine-grained and low overhead data bufferpool management to effectively minimize IO cost. According to our empiricalevaluations LogStore has good performance in write operation, recovery andreplication

In Search of a Key Value Store with High Performance and High Availability