公开(公告)号：US10956250B1

公开(公告)日：2021-03-23

申请号：US16364045

申请日：2019-03-25

Applicant: Amazon Technologies, Inc.

Inventor： Akshat Vig ,  Rashmi Krishnaiah Setty ,  Joon Ahn ,  Somasundaram Perianayagam ,  Fahad Ahmed ,  Kapil Singh ,  Stefano Stefani ,  Vaibhav Jain

IPC: G06F11/07 ,  G06F16/176 ,  G06F16/84

Abstract: Systems and methods are provided to implement a database system configured to return the state of a data item upon failure of a condition check on the data item during a conditional write. In embodiments, a write request may specify an indicator to return the item state upon condition failure. The request may specify multiple database operations to execute as a transaction, where failure of a single condition check will cause the entire transaction to fail and an item state causing the failure to be returned. The returned state of the data item may include a selection of the item's attributes specified by the request. Advantageously, these features allow a client to easily obtain the precise cause of a write's failure. Moreover, because the item state is returned only when a conditional write fails and only when requested, the response size of most write requests remains unchanged.