# US 10,873,516 B2 · Content delivery network server testing > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,873,516 B2 - Document ID: US10873516B2 - Status: Granted - Kind: B2 - Application number: 15/989,419 - Filed: 2018-05-25 - Published: 2019-11-28 - Granted: 2020-12-22 - Earliest claimed: 2018-05-25 - Assignees: Comcast Cable Communications, LLC - Applicants: Comcast Cable Communications, LLC - Inventors: Chris Lemmons - Web page: https://patentgrep.com/patent/US10873516B2 ## CPC - H04L 43/50: Testing arrangements - H04L 43/0852: Delays - H04L 43/16: Threshold monitoring - H04L 67/10: in which an application is distributed across nodes in the network (software deployment G06F8/60; multiprogramming arrangements G06F9/46) - H04L 41/045: comprising client-server management architectures - H04L 41/12: Discovery or management of network topologies - H04L 43/022: by sampling - H04L 43/0876: Network utilisation, e.g. volume of load or congestion level - H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M) ## Abstract Described herein is a system and method for testing a computing device, such as a server, to minimize network impact. A computing device that is new or needs to be evaluated, such as an edge server, in a content delivery network may be determined and a sibling edge server which shares a common characteristic with the edge server may be selected. Requests received on the sibling edge server may be collected and filtered to determine a subset of the requests. The subset of the requests are transmitted to the edge server for processing and evaluation. ## Claims ### Claim 1 A device-implemented method comprising: selecting a first server in a content delivery network comprising a plurality of servers that are associated with a plurality of mid-tier servers in a hierarchy; selecting a sibling server, in the plurality of the servers, that shares a common parent mid-tier server with the first server; determining requests received by the selected sibling server; determining, based on an expiration schedule of content associated with the determined requests, an amount of delay time before sending the determined requests to the first server; and after waiting for the amount of delay time, sending the determined requests to the first server. ### Claim 2 (depends on 1) The device-implemented method of claim 1, wherein determining the amount of delay time comprises: determining the amount of delay time based on a type of content associated with the requests. ### Claim 3 (depends on 1) The device-implemented method of claim 1, wherein determining the requests further comprises: filtering to select a subset from the determined requests. ### Claim 4 (depends on 1) The device-implemented method of claim 1, wherein determining the requests further comprises: filtering out requests associated with expired content based on the expiration schedule. ### Claim 5 (depends on 1) The device-implemented method of claim 1, wherein determining the requests further comprises: amplifying a subset of the determined requests based on an amplification rate; and sending the amplified subset of the determined requests to the first server. ### Claim 6 (depends on 1) The device-implemented method of claim 1, further comprising: determining a sampling rate; sampling a subset of the determined requests based on the sampling rate to generate a partition of the subset of the determined requests; and sending the partition to the first server. ### Claim 7 (depends on 6) The device-implemented method of claim 6, wherein the amount of delay time is zero. ### Claim 8 (depends on 6) The device-implemented method of claim 6, wherein determining the sampling rate is based on a target load to be generated on the first server. ### Claim 9 (depends on 1) The device-implemented method of claim 1, further comprising: receiving, from the first server, a set of log information during or after a run of a load test with a load generated using the determined requests; and adjusting the amount of delay time based on the set of log information. ### Claim 10 (depends on 9) The device-implemented method of claim 9, further comprising: increasing the amount of delay time based on a determination that a quantity of requests sent upstream from the common parent mid-tier server satisfies a threshold value. ### Claim 11 (depends on 9) The device-implemented method of claim 9, further comprising: decreasing the amount of delay time based on a determination that a quantity of requests sent upstream from the common parent mid-tier server is below a threshold value. ### Claim 12 A device-implemented method comprising: determining a first server and a sibling server in a content delivery network, wherein the first server and the sibling server both connect to a common parent mid-tier server; determining an expiration schedule for a list of content on the common parent mid-tier server; receiving a history of requests from the sibling server; based on the history of requests, selecting a subset of the requests, by; filtering out requests associated with expired content based on the expiration schedule; and sending the subset of the requests to the first server. ### Claim 13 (depends on 12) The device-implemented method of claim 12, further comprising: determining a sampling rate; sampling the subset of the requests based on the sampling rate to generate a partition of the subset of the requests; and sending the partition to the first server. ### Claim 14 (depends on 12) The device-implemented method of claim 12, further comprising: amplifying the subset of the requests based on an amplification rate; and sending the amplified subset of the requests to the first server. ### Claim 15 An apparatus comprising: one or more processors; and memory storing instructions that, when executed by the one or more processors, cause the apparatus to: determine a first server in a content delivery network comprising a plurality of servers that are associated with a plurality of mid-tier servers in a hierarchy; select a sibling server in the plurality of the servers that shares a common parent mid-tier server with the first server; determine requests received the selected sibling server; determine, based on an expiration schedule of content associated with the determined requests, an amount of delay time before sending the determined requests to the first server; and after waiting for the amount of delay time, send the determined requests to the first server. ### Claim 16 (depends on 15) The apparatus of claim 15, wherein the amount of delay time is zero. ### Claim 17 (depends on 15) The apparatus of claim 15, wherein the memory stores instructions that, when executed by the one or more processors, further cause the apparatus to: filter to select a subset from the determined requests. ### Claim 18 (depends on 15) The apparatus of claim 15, wherein the memory stores instructions that, when executed by the one or more processors, further cause the apparatus to: filter out requests associated with expired content, from the determined requests, based on the expiration schedule. ### Claim 19 (depends on 15) The apparatus of claim 15, wherein the memory stores instructions that, when executed by the one or more processors, further cause the apparatus to: amplify a subset of the determined requests based on an amplification rate; and send the amplified subset of the determined requests to the first server. ### Claim 20 (depends on 15) The apparatus of claim 15, wherein the memory stores instructions that, when executed by the one or more processors, further cause the apparatus to: determine a sampling rate; sample a subset of the determined requests based on the sampling rate to generate a partition of the subset of the determined requests; and send the partition to the first server.