DEFRAGMENTATION OF ADAPTIVE STREAMING SEGMENT FILES IN A CONTENT DELIVERY NETWORK

摘要

An edge node, a parent node, and a method in a Content Delivery Network (CDN) configured to utilize adaptive streaming to deliver a piece of electronic content to requesting clients. The content includes a plurality of segment files referenced by an associated manifest document, and the nodes are configured to defragment an incomplete piece of content and ensure that a copy stored in each node contain all segment files referenced by the manifest document. Each node analyzes the manifest document and the segment files stored in its cache memory to determine whether any segment files referenced by the manifest document are absent from the memory. If so, the node pulls the absent segment files from another node in the CDN to complete the piece of content. The defragmentation may be performed during a period of minimum network usage to minimize network impact and within a popularity time window to ensure timely storage of the defragmented content in each node.

主权项

1. A method in an edge node of a Content Distribution Network (CDN) for ensuring that a memory of the edge node contains all segment files referenced by an associated manifest document, the method comprising the steps of:
analyzing the associated manifest document and the segment files stored in the memory of the edge node to determine whether any of the segment files referenced by the associated manifest document are absent from the memory of the edge node; and upon determining there are segment files referenced by the associated manifest document that are absent from the memory of the edge node, pulling the absent segment files from another node in the CDN and storing the pulled segment files in the memory of the edge node.