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| Yahoo Sherpa ： ウィキペディア英語版 |
Yahoo Sherpa
Sherpa is Yahoo's next-generation cloud storage platform. It is a hosted, distributed and geographically replicated key-value data store. It is a NoSQL system that has been developed by Yahoo, to address scalability, availability, and latency needs of Yahoo websites. Sherpa has abilities such as elastic growth, multi-tenancy, global footprint for local low-latency access, asynchronous replication, representational state transfer (REST) based web service APIs, novel per-record consistency knobs, high availability, compression, secondary indexes, and record-level replication.
== Architecture ==
Sherpa is a multi-tenant system. An application can store data in a table, which is a collection of records. A table is sharded into smaller pieces called tablets. Data is sharded based on the hash value of the key, or range partitioned. Tablets are stored on nodes referred to as storage units. A software routing layer keeps track of mapping between applications tablets and storage units. Applications send requests to the router, which forwards them to the correct storage unit based on the tablet map. Clients can get, set, delete, and scan records via unique record primary keys.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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