Amazon Technologies, Inc.

Michael T Helmick

Jakub Kulesza

Stefano Stefani

David Alan Lutz

Timothy Andrew Rath

Disclosed are various embodiments for distributing data items within a plurality of nodes. A data item that is subject to a data item update request is updated from a master node to a plurality of slave notes. The update of the data item is determined to be locality-based durable based at least in part on acknowledgements received from the slave nodes. Upon detection that the master node has failed, a new master candidate is determined via an election among the plurality of slave nodes.

Locality based quorums

Disclosed are various embodiments for distributing data items. A plurality of nodes forms a distributed data store. A new master candidate is determined through an election among the plurality of nodes. Before performing a failover from a failed master to the new master candidate, a consensus is reached among a locality-based failover quorum of the nodes. The quorum excludes any of the nodes that are in a failover quorum ineligibility mode.

Locality based quorum eligibility

Disclosed are various embodiments for distributing data items within a plurality of nodes. A data item update request is replicated from a master node in a plurality of nodes to a plurality of slave nodes within the plurality of nodes. The replicated data item update request is determined to be locality-based durable. Responsive to the determination that the replicated data item update request is locality-based durable, the data item update request is confirmed to a client, wherein the client had originated the data item update request. Upon failover of the master node to another node within the plurality of nodes, a fault-tolerant failover quorum ensures that all previously confirmed updates are found and recognized by the new master node.

Disclosed are various embodiments for failover recovery in a distributed data store. A computing device determines whether it is a master data store in a distributed data store. New data item updates are assigned the next transaction identifier in a gapless numbering scheme relative to the most durably persisted entry. New data item updates are also associated with a data store identifier that identifies the new master data store.

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Seattle, WA, United States of America

Michael T Helmick