What is Open Caching?
A New Approach for Streaming:
Many Caches, All Connected
Since the beginning of streaming video, caches have been largely proprietary. Even when developed using open source technologies, like Squid, companies often made unique enhancements and developed their own approaches to hierarchies, session windows, and even the OS TCP stack. Now, with most streaming operators employing multiple CDNs, managing all of the caches across the different networks from a single interface is extremely complex. Open Caching is an attempt to level the paying field so content rights holders, network operators, and CDNs all have visibility into the caching network.
Click on a box to get more detail about the Open Caching component.
Enabling Caching Interoperability
Three key components make up an Open Caching Network.
An Open Caching Node represents a caching server, within a content delivery architecture, that complies with Open Caching specifications. The cache can either be built using the specifications (such as for an ISP implementing Open Caching at the edge of their network), or Open Caching functionality can be added through plugins or other means (such as for a Content Delivery Network caches or OTT Platform origins).
The Request Router handles the inbound request for content and forwards this request to the appropriate caching node within an environment. The Open Caching specifications identify three methods of routing: DNS, HTTP, and Manifest.
The Control Plane handles all communication related to management of configurations, content purging and pre-positioning, logging, and security. While the Request workflow is focused on the end user’s ability to retrieve content, the Control Plane is focused on how the different members of the video distribution chain are empowered to partake in the delivery process.
The Industry is Beginning to Notice
Open Caching Implementations
Open Cache Request Routing Service Provisioning Interface Specification
This includes the functional specification of open-caching service provisioning interfaces enabling a CDN and an SP to exchange information to enable the delegation of CDN content requests to the SP Open Caching system.