The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Feb. 14, 2017
Filed:
Nov. 13, 2014
Dropbox, Inc., San Francisco, CA (US);
James Cowling, San Francisco, CA (US);
Venkata Harish Mallipeddi, San Francisco, CA (US);
Dropbox, Inc., San Francisco, CA (US);
Abstract
A data storage system includes multiple zones that comprise separate geographic storage locations and store replicated copies of data items. Upon receiving a delete operation at a local zone at a time t, if a copy of the first data item exists in the local zone, the system computes a maximum last update time t=t−t, wherein tis a minimum lifetime for a data item. Next, the system determines, from a local index, a time tthat the first data item was last updated. If t<t, the system deletes the copy of the first data item in the local zone. The system also asynchronously propagates the delete operation to other zones in the data storage system along with t, wherein the delete operation is performed in another zone if the other zone determines that the first data item was last updated before t.