Selectable storage endpoints for a transactional data storage engine

A method, comprising:

• performing, by one or more computing devices:
• receiving, at a transactional data storage engine, a selection of one or more storage endpoints from a client of the transactional data storage engine identifying storage locations maintaining respective replicas of data for the transactional data storage engine, wherein the received selection of storage endpoints comprises a modification to a storage engine configuration of the transactional data storage engine, wherein the received selection of storage endpoints indicates whether a respective replica is strongly consistent or eventually consistent for at least some of the storage endpoints;
• in response to receiving the selection of the one or more storage endpoints, updating mapping information for the storage engine configuration for the transactional data storage engine to indicate the one or more storage endpoints and whether the respective replicas are strongly consistent or eventually consistent;
• in response to receiving an access request for at least a portion of the data at the transactional data storage engine:
• selecting at least one storage endpoint from the one or more storage endpoints to service the access request, wherein the selecting of the at least one storage endpoint is based, at least in part, on the updated mapping information and on whether the respective replicas are strongly consistent or eventually consistent;
• and
• sending the access request to the selected at least one storage endpoint.

A non-transitory, computer-readable storage medium, storing program instructions that when executed by one or more computing devices cause the one or more computing devices to implement a transactional data storage engine, comprising a storage engine configuration, that implements:

• receiving, at a transactional data storage engine, a selection of one or more storage endpoints from a client of the transactional data storage engine identifying storage locations maintaining respective replicas of data for the transactional data storage engine, wherein the received selection of one or more storage endpoints comprises a modification to the storage engine configuration of the transactional data storage engine, wherein the received selection of storage endpoints indicates whether a respective replica is strongly consistent or eventually consistent for at least some of the storage endpoints;
• in response to receiving the selection of the one or more storage endpoints, updating mapping information for the storage engine configuration for the transactional data storage engine to indicate the one or more storage endpoints and whether the respective replicas are strongly consistent or eventually consistent;
• in response to receiving an access request for at least a portion of the data at the transactional data storage engine:
• selecting at least one storage endpoint from the one or more storage endpoints to service the access request, wherein the selecting of the at least one storage endpoint is based, at least in part, on the updated mapping information and on whether the respective replicas are strongly consistent or eventually consistent;
• and
• sending the access request to the selected at least one storage endpoint.