Multi-blob consistency for atomic data transactions

摘要

A multi-blob consistency component of a tiered middleware framework ensures data blobs are transacted in an atomic manner. The component determines a data blob of a data store to be modified based on an application request. The component then reads a master blob to locate a stored version number of the data blob to be modified and a version number of the master blob. A new data blob with a new version number that replaces the data blob to be modified is written to the data store. The component then reads the master blob again to re-obtain the version number of the master blob. Thus, when the obtained and re-obtained version numbers match, the component replaces the stored version number of the data blob with the new version number of the new data blob. Further, the component deletes the data blob to be modified using the stored version number.