Updating Object Attributes in a Lock-Coupled Namespace Traversal

摘要

A deferred mechanism of rolling attribute changes to objects at transaction commit time is described. To support rolling updates, attributes are categorized into three types—increment, decrement or replace. Since transactions are committed in order, the update process uses a notification list of dependent transactions to propagate attribute changes as a function of attribute category or type. Shadow based file-systems (with or without object versioning) realize efficiency gains by employing the deferred mechanism.

主权项

1. A method, comprising:
maintaining object attributes in a shadowed file system; for each object attribute in the shadowed file system, determining a respective attribute category; and through a list of one or more transactions, propagating rolling updates to the object attributes according to determined attribute category.