READ DESCRIPTORS AT HETEROGENEOUS STORAGE SYSTEMS

摘要

In response to a read request directed to a first data store of a storage group, a state transition indicator is identified, corresponding to a modification that has been applied at the data store before a response to the read is prepared. A read descriptor that includes the state transition indicator and read repeatability verification metadata is prepared. The metadata can be used to check whether the read request is a repeatable read. The read descriptor is transmitted to a client-side component of the storage group.

主权项

1. A system, comprising:
one or more computing devices configured to:
receive a first read request directed to a first data store of a plurality of data stores of a heterogeneous storage group, wherein the first read request comprises a first filtering criterion to be used to identify a first result set;determine an indicator of a particular state transition, wherein the particular state transition comprises one or more modifications applied to the first data store prior to an identification of the first result set;identify the first result set using the first filtering criterion;generate a read descriptor comprising (a) the indicator of the particular state transition and (b) read repeatability verification metadata (RRVM) usable to determine whether the first read request represents a repeatable read;transmit the first result set and a representation of the read descriptor to a client-side component of the heterogeneous storage group; anddetermine, based at least in part on an analysis of the read descriptor, that a write request directed to a particular data store of the heterogeneous storage group subsequent to the first read request meets an acceptance criterion.