Pivotal Software, Inc.

Kenneth E Sell

Jeffrey Ira Cohen

Caleb E Welton

Milena Bergant

King Lun Choi

A process for upgrading a mirrored shared-nothing database system comprises a sequence of short well-defined idempotent steps, and at least one non-idempotent step involving transforming a master catalog. The upgrade process is managed and controlled by a state machine that has a persistent memory running on the master node. In the event of a failure or crash during an idempotent step, the process stops the database in the current state and repeats the step. If a failure or crash occurs during a non-idempotent step, the upgrade process is rolled back to the beginning and repeated.

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Sunnyvale, CA, United States of America

Kenneth E Sell