Amazon Technologies, Inc.

Matthew David Allen

Anurag Windlass Gupta

Pradeep Jnana Madhavarapu

James McClellan Corey

Laurion Darrell Burchall

A separate distributed buffer cache system may be implemented for a storage client of a distributed storage system. Storage I/O requests may be sent from a storage client to one or more buffer cache nodes in a distributed buffer cache system that maintain portions of an in-memory buffer cache to which the requests pertain. The distributed buffer cache system may send the write requests on to the distributed storage system to be completed, and in response to receiving acknowledgements from the storage system, sending a completion acknowledgement back to the storage client. Buffer cache nodes may update buffer cache entries for received requests such that they are not available for reads until complete at the distributed storage system. For read requests where the buffer cache entries at the buffer cache node are invalid, valid data may be obtained from the distributed storage system and sent to the storage client.

Distributed cache nodes to send redo log records and receive acknowledgments to satisfy a write quorum requirement

Distributed in-memory buffer cache system using buffer cache nodes

A database system may implement database cache survivability across database failures. In various embodiments, a database cache may be maintained independent of a failure of a database. A database cache may be maintained in a non-volatile memory device or maintained in a shared memory segment of system memory. Upon recovery from a database failure, a recovery point may be determined that indicates a consistent state of the database. Cache entries of the database cache inconsistent with the consistent state of the database may be invalidated, and the database cache may be made available for access requests directed toward the database. Valid cache entries from before the database failure may be made available without accessing a back-end data store for the database.

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Seattle, WA, United States of America

Matthew David Allen