Migration of Unified Table Metadata Graph Nodes

摘要

Metadata is stored within a database for each of a plurality of objects in different frames associated with a structure descriptor (e.g., a container directory entry, etc.). The frames are part of a metadata page and each comprising an object and a header specifying a version identifier for the object and a size of the object. The structure descriptor initially is built for a first build identifier. Thereafter, upon the structure descriptor changing from the first build identifier to a second build identifier, at least one of the objects that require migration is identified. The identification is based on the version identifier for the object being different from the second build identifier. In response, the identified objects are migrated from their corresponding frame to a new frame. The new frame includes the objects and new headers that include a version identifier equal to the second build identifier.

主权项

1. A method comprising:
storing, within a database, metadata for each of a plurality of objects in different frames associated with a structure descriptor, the frames being part of a metadata page and each comprising an object and a header specifying a version identifier for the object and a size of the object, the structure descriptor initially being for a first build identifier; identifying, upon the structure descriptor changing from the first build identifier to a second build identifier, at least one of the objects that requires migration, the identification being based on the version identifier for the object being different from the second build identifier; and migrating the identified objects from their corresponding frame to a new frame, the new frame including the objects and new headers that include a version identifier equal to the second build identifier.