Amazon Technologies, Inc.

Andrew Christopher Schleit

Andrew Kent Warfield

Munif M Farhan

Seth William Markle

Keun Soo Jo

James Alexander Bornholt

Aaron Ben Fernandes

Andrei N Krotkov

Shen Li

Sean Robert Connell

Arjan Xeka

Nicolas Valere Choumitsky

Technologies are provided for supporting storage device write barriers. A host computer can be configured to transmit a write barrier command to a storage device to indicate that one or more data access commands should be processed before one or more other data access commands are processed. For example, a host computer can transmit one or more data access commands to a storage device. The host computer can then transmit a write barrier command to the storage device. The storage device can be configured to receive the write barrier command and to associate a write barrier with the one or more data access commands. The host computer can continue to transmit additional data access commands to the storage device. However, the storage device will not process the additional data access commands until after the one or more data access commands associated with the write barrier have been processed.

Storage device write barriers

Technologies are provided for supporting storage device write barriers. A storage device can be configured to associate a data access command with a write barrier. The write barrier can be used to indicate that one or more data access commands should be processed before one or more other data access commands are processed. For example, a host computer can transmit one or more data access commands to a storage device. The storage device can determine that the one or more data access commands are associated with a write barrier. The host computer can continue to transmit additional data access commands to the storage device. However, the storage device will not process the additional data access commands until after the one or more data access commands associated with the write barrier have been processed.

Described are techniques for reducing inaccurate values in databases by managing the order in which processes are enqueued and executed. A modification process to modify a first value in a database may be received. A precomputation process that modifies values dependent on the first value may be enqueued prior to enqueuing of the modification process to ensure that the modification process does not occur if the precomputation process fails. The modification process may be executed prior to executing the precomputation process to ensure that the precomputation process acts to modify the dependent values using the modified version of the first value.

Systems for consistent modification of stored values

Described are techniques for maintaining the accuracy of a precomputed output by determining sets of instructions for accessing and extracting values from individual data sources used to determine the output. Responsive to the determination of a modification to data in the data source, the data sources may be accessed to determine values that may be used to modify the precomputed output. The sets of instructions for accessing the data sources may be determined based on the relationships between different data sources and between one or more data sources and the output.

System for maintaining precomputed values determined from data sources

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Seattle, WA, United States of America

Andrew Christopher Schleit