LSM-based Storage Techniques: A Survey
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In recent years, Log-Structured Merge-trees (LSM-trees) have been widely adopted for use in the storage layer of modern NoSQL systems. Because of this, there have been a large number of research efforts, from both the database community and the systems community, that try to improve various aspects of LSM-trees. In this paper, we provide a survey of recent LSM efforts so that readers can learn the state of the art in LSM-based storage techniques. We provide a general taxonomy to classify the literature of LSM improvements, survey the efforts in detail, and discuss their strengths and trade-offs. We further survey several representative LSM-based open-source NoSQL systems and we discuss some potential future research directions resulting from the survey.
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