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:
Jun. 27, 2017
Filed:
Sep. 25, 2014
Dropbox, Inc., San Francisco, CA (US);
James Cowling, San Francisco, CA (US);
James Turner, Mountain View, CA (US);
Dropbox, Inc., San Francisco, CA (US);
Abstract
A append-only data storage system that stores sets of data blocks in extents that are located in storage devices. When an extent becomes full, the system changes the extent from an open state, wherein data can be appended to the extent, to a closed state, wherein data cannot be appended to the extent. This change involves performing a synchronization operation by: obtaining a list of data blocks in the extent from each storage device that has a copy of the extent; forming a union of the lists; looking up data blocks from the union in a database that maps data blocks to storage devices and extents to determine which data blocks belong in the extent; and if a copy of the extent is missing data blocks that belong in the extent, performing a remedial action before changing the extent from the open state to the closed state.