Amazon Technologies, Inc.

Vijayasarathy Kannan

Arvinth Ravi

Phillip H Pruett, Iv

Vishwas Narendra

Nikhil Shah

James Zuber

Pierre Vigneras

Janko Jerinic

Nicholas Jacob Essenburg

Liming Ye

Prathiban Mohanasundaram

Sameer Choudhary

Hardik Navin Nagda

Bryan T Wilkinson

Nishant Jain

Tyler Michael Jung

Rajesh Sampath

Suchindra Yogendra Agarwal

David Grant Emeny-Smith

Systems and methods are provided for efficiently maintaining a transaction sequence witness service to ensure that requests to read data provide consistent results across all storage nodes in a distributed system. When a storage node receives a request for a data object, the node may obtain&#x2014;from transaction sequence witness service&#x2014;the latest sequence number associated with the object. If the sequence number indicates the object has been modified in the period of time since the currently stored version was stored, the node can obtain the current version from persistent storage.

Witness service for ensuring data consistency in a distributed storage system

Systems and methods are provided for managing data partitions in a distributed storage system and, in particular, the routing data used by the distributed storage system to route requests to the proper caching layers, persistent storage nodes, etc. Data items may be managed in a multi-tier configuration in which they are grouped into different partitions based on their key prefixes, and partitions are grouped into different cells based on key ranges. When partitions are moved from cell-to-cell, or when cells are split, the routing data is changed accordingly. In order to ensure that the correct routing data is used throughout the distributed storage system, a change to routing data may be accompanied by a special barrier record being written to the transaction log of affected partitions.

Request routing management for a distributed storage system

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Vijayasarathy Kannan