Amazon Technologies, Inc.

Aman Gupta

Onkar Bhaskar Walavalkar

Abhishek Arora

Christopher Chandler

Xuetao Fan

Kurtis Robert Kuszmaul

Andrew Evenson

Krishnan Ananthanarayanan Kolazhi

Hari Chandana Kanchanapally

Cheng Shao

Pranav Agarwal

Methods, systems, and computer-readable media for delivery of log records to stateless clients are disclosed. A record delivery system receives, from a client, a first request to read from a persistent log comprising an ordered sequence of records. The first request is associated with a receiver session. The system sends a first set of records to the client and stores a data structure indicating that the first set of records was sent to the client in the receiver session. The system receives, from the client, a second request to read from the persistent log in the receiver session. Based at least in part on the data structure, the system determines a second set of one or more records in the persistent log. The system sends the second set of records to the client.

Delivery of log records to stateless clients

A service testing system is disclosed to enable consistent replay of stateful requests on a service whose output depends on the service's execution state prior to the requests. In embodiments, the service implements a compute engine that executes service requests and a storage subsystem that maintains execution states during the execution of stateful requests. When a stateful request is received during testing, the storage subsystem creates an in-memory test copy of the execution state to support execution of the request, and provides the test copy to the compute engine. In embodiments, the storage subsystem will create a separate instance of execution state for each individual test run. The disclosed techniques enable mock execution states to be easily created for testing of stateful requests, in a manner that is transparent to the compute engine and does not impact production execution data maintained by the service.

Sharing execution states among storage nodes during testing of stateful software

Bypassing generation of non-repeatable parameters during software testing

Consistent replay of stateful requests during software testing

Spoofing stateful dependencies during software testing

An item review system is disclosed that detects that an item reviewed or being reviewed by a user is similar to one or more items previously reviewed by the user. In some embodiments, the system provides an option for the user to modify the prior review of each such similar item, as may be desirable to capture the user's changed perception of the previously reviewed item. The system may additionally or alternatively display the prior review(s) as the user generates the new review, such that the user can take these prior reviews into consideration.

Item review system that provides comparative information to reviewer

Growing community of inventors

Seattle, WA, United States of America

Aman Gupta