Facebook, Inc.

Yee Jiun Song

Sanjeev Kumar

Philippe Vincent Ajoux

Harry Li

Sabyasachi Roy

Laurent Demailly

Liat Atsmon Guz

Jason Scott Sobel

Rajesh Nishtala

Wendy Tobagus

Aravind Narayanan

Various embodiments implement a secure content distribution architecture involving a content delivery network (CDN). A web server system can encrypt a content file and store the encrypted content file in an origin data center. The web server system can store a decryption key for decrypting the content file. The CDN can fetch the encrypted content file after the content file is first requested by the CDN from the origin cache system. When a client device requests access to a website supported by the web server system, the web server system can provide a blueprint of a page of the website, a link to the content file in the CDN, and the decryption key for decrypting the content file. The client device can then request the encrypted content file from the CDN and utilize the decryption key to decrypt the encrypted content file.

Data security for content delivery networks

Disclosed is a technology for publishing subscriptions in a publish-subscribe system in accordance with subscription groups. The technology may include (i) determining a consumption characteristic by which each of multiple subscribers in a publish-subscribe system consumes a subscription published by a publisher; (ii) identifying the subscribers whose consumption characteristics satisfy a specified similarity criterion; (iii) defining multiple subscription groups, each of which includes subscriptions of those of the subscribers whose consumption characteristics satisfy the specified similarity criterion; (iv) storing the subscriptions in multiple logical partitions of a storage system where each of the logical partitions contains a separate non-overlapping subset of the subscriptions; and (v) transmitting the subscriptions to the subscribers in accordance with the subscription groups.

Subscription groups in publish-subscribe system

When multiple regional data clusters are used to store data in a system, maintaining cache consistency across different regions is important for providing a desirable user experience. In one embodiment, there is a master data cluster where all data writes are performed, and the writes are replicated to each of the slave data clusters in the other regions. Appended to the replication statements are invalidations for cache values for the keys whose values have been changed in the master data cluster. An apparatus in the master data cluster logs replication statements sent to the slave databases. When a slave database fails, the apparatus extracts the invalidations intended for the failed database and publishes the invalidations to a subscriber in the region of the failed database. The subscriber sends the invalidations to the local caches to cause stale data for those keys to be deleted from the caches.

System and method for implementing cache consistent regional clusters

Disclosed is a method and system for publishing subscriptions in a publish-subscribe system in accordance with subscription groups. Embodiments may include (i) determining a consumption characteristic by which each of a plurality of subscribers in a publish-subscribe system consumes a subscription published by a publisher; (ii) identifying the subscribers whose consumption characteristics satisfy a specified similarity criterion; (iii) defining a plurality of subscription groups, each of which includes subscriptions of those of the subscribers whose consumption characteristics satisfy the specified similarity criterion; and (iv) transmitting the subscriptions to the subscribers in accordance with the subscription groups. Embodiments may also include moving a subscription of the subscriber, from a first subscription group having subscriptions of those of the subscribers whose consumption characteristics correspond to a first specified similarity criterion, to a second subscription group having subscriptions of those of the subscribers whose consumption characteristics correspond to a second specified similarity criterion.

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San Bruno, CA, United States of America

Yee Jiun Song