Dear All, We are working on HLS streaming. Once # of concurrent sessions reach around 4K, we are experiencing issues regarding the cache algorithm.
Although Cache.config is set to 10minutes for ts files ( url_regex=(.*)\.(ts)$ ttl-in-cache=10m ), lots of requests will be directed to origin server which previously get http 200 from origin server, ATS continues to direct the request to origin server. Have anyone experienced such an issue? Or does anyone have an idea how to solve this issue? Please see origin server log below… ATS sending lots of requests for the same file at the same time although it gets http 200. 176.235.11.9 - - [07/Mar/2018:15:18:04 +0300] "GET /Fashionbox/20180125T023356-06-357677.ts HTTP/1.1" 200 665896 "-" "User-Agent" 176.235.11.9 - - [07/Mar/2018:15:18:04 +0300] "GET /Fashionbox/20180125T023356-06-357677.ts HTTP/1.1" 200 665896 "-" "User-Agent" 176.235.11.9 - - [07/Mar/2018:15:18:04 +0300] "GET /Fashionbox/20180125T023356-06-357677.ts HTTP/1.1" 200 181000 "-" "User-Agent" 176.235.11.9 - - [07/Mar/2018:15:18:04 +0300] "GET /Fashionbox/20180125T023356-06-357677.ts HTTP/1.1" 200 665896 "-" "User-Agent" 176.235.11.9 - - [07/Mar/2018:15:18:04 +0300] "GET /Fashionbox/20180125T023356-06-357677.ts HTTP/1.1" 200 665896 "-" "User-Agent" 176.235.11.9 - - [07/Mar/2018:15:18:04 +0300] "GET /Fashionbox/20180125T023356-06-357677.ts HTTP/1.1" 200 665896 "-" "User-Agent" 176.235.11.9 - - [07/Mar/2018:15:18:04 +0300] "GET /Fashionbox/20180125T023356-06-357677.ts HTTP/1.1" 200 665896 "-" "User-Agent" 176.235.11.9 - - [07/Mar/2018:15:18:04 +0300] "GET /Fashionbox/20180125T023356-06-357677.ts HTTP/1.1" 200 665896 "-" "User-Agent" 176.235.11.9 - - [07/Mar/2018:15:18:04 +0300] "GET /Fashionbox/20180125T023356-06-357677.ts HTTP/1.1" 200 665896 "-" "User-Agent" 176.235.11.9 - - [07/Mar/2018:15:18:04 +0300] "GET /Fashionbox/20180125T023356-06-357677.ts HTTP/1.1" 200 665896 "-" "User-Agent" 176.235.11.9 - - [07/Mar/2018:15:18:04 +0300] "GET /Fashionbox/20180125T023356-06-357677.ts HTTP/1.1" 200 665896 "-" "User-Agent" 176.235.11.9 - - [07/Mar/2018:15:18:04 +0300] "GET /Fashionbox/20180125T023356-06-357677.ts HTTP/1.1" 200 665896 "-" "User-Agent" 176.235.11.9 - - [07/Mar/2018:15:18:04 +0300] "GET /Fashionbox/20180125T023356-06-357677.ts HTTP/1.1" 200 665896 "-" "User-Agent" 176.235.11.9 - - [07/Mar/2018:15:18:04 +0300] "GET /Fashionbox/20180125T023356-06-357677.ts HTTP/1.1" 200 665896 "-" "User-Agent" 176.235.11.9 - - [07/Mar/2018:15:18:04 +0300] "GET /Fashionbox/20180125T023356-06-357677.ts HTTP/1.1" 200 665896 "-" "User-Agent" 176.235.11.9 - - [07/Mar/2018:15:18:04 +0300] "GET /Fashionbox/20180125T023356-06-357677.ts HTTP/1.1" 200 665896 "-" "User-Agent" 176.235.11.9 - - [07/Mar/2018:15:18:04 +0300] "GET /Fashionbox/20180125T023356-06-357677.ts HTTP/1.1" 200 665896 "-" "User-Agent" 176.235.11.9 - - [07/Mar/2018:15:18:04 +0300] "GET /Fashionbox/20180125T023356-06-357677.ts HTTP/1.1" 200 665896 "-" "User-Agent" 176.235.11.9 - - [07/Mar/2018:15:18:04 +0300] "GET /Fashionbox/20180125T023356-06-357677.ts HTTP/1.1" 200 78192 "-" "User-Agent" 176.235.11.9 - - [07/Mar/2018:15:18:04 +0300] "GET /Fashionbox/20180125T023356-06-357677.ts HTTP/1.1" 200 665896 "-" "User-Agent" 176.235.11.9 - - [07/Mar/2018:15:18:04 +0300] "GET /Fashionbox/20180125T023356-06-357677.ts HTTP/1.1" 200 665896 "-" "User-Agent" 176.235.11.9 - - [07/Mar/2018:15:18:04 +0300] "GET /Fashionbox/20180125T023356-06-357677.ts HTTP/1.1" 200 665896 "-" "User-Agent" Please see ATS log at the same time; 1520425086.244 chi=52.214.59.217 phn=tvgbzcdnes02 php=80 shn=176.235.11.2 url=http://tvgbztcdnes02.channels.turkcelltvplus.com.tr/Fashionbox/20180125T023356-06-357677.ts cqhm=GET cqhv=HTTP/1.1 pssc=200 ttms=39879 b=665896 sssc=200 sscl=665896 cfsc=FIN pfsc=FIN crc=TCP_MISS phr=DIRECT pqsn=176.235.11.2 uas="User-Agent" 1520425086.254 chi=34.245.110.191 phn=tvgbzcdnes02 php=80 shn=176.235.11.2 url=http://tvgbztcdnes02.channels.turkcelltvplus.com.tr/Fashionbox/20180125T023356-06-357677.ts cqhm=GET cqhv=HTTP/1.1 pssc=200 ttms=40006 b=665896 sssc=200 sscl=665896 cfsc=FIN pfsc=FIN crc=TCP_MISS phr=DIRECT pqsn=176.235.11.2 uas="User-Agent" 1520425086.257 chi=34.242.200.72 phn=tvgbzcdnes02 php=80 shn=176.235.11.2 url=http://tvgbztcdnes02.channels.turkcelltvplus.com.tr/Fashionbox/20180125T023356-06-357677.ts cqhm=GET cqhv=HTTP/1.1 pssc=200 ttms=40043 b=665896 sssc=200 sscl=665896 cfsc=FIN pfsc=FIN crc=TCP_MISS phr=DIRECT pqsn=176.235.11.2 uas="User-Agent" 1520425086.258 chi=34.253.240.24 phn=tvgbzcdnes02 php=80 shn=176.235.11.2 url=http://tvgbztcdnes02.channels.turkcelltvplus.com.tr/Fashionbox/20180125T023356-06-357677.ts cqhm=GET cqhv=HTTP/1.1 pssc=200 ttms=39944 b=665896 sssc=200 sscl=665896 cfsc=FIN pfsc=FIN crc=TCP_MISS phr=DIRECT pqsn=176.235.11.2 uas="User-Agent" 1520425086.259 chi=54.171.6.29 phn=tvgbzcdnes02 php=80 shn=176.235.11.2 url=http://tvgbztcdnes02.channels.turkcelltvplus.com.tr/Fashionbox/20180125T023356-06-357677.ts cqhm=GET cqhv=HTTP/1.1 pssc=200 ttms=39951 b=665896 sssc=200 sscl=665896 cfsc=FIN pfsc=FIN crc=TCP_MISS phr=DIRECT pqsn=176.235.11.2 uas="User-Agent" 1520425086.259 chi=34.245.98.243 phn=tvgbzcdnes02 php=80 shn=176.235.11.2 url=http://tvgbztcdnes02.channels.turkcelltvplus.com.tr/Fashionbox/20180125T023356-06-357677.ts cqhm=GET cqhv=HTTP/1.1 pssc=200 ttms=40047 b=665896 sssc=200 sscl=665896 cfsc=FIN pfsc=FIN crc=TCP_MISS phr=DIRECT pqsn=176.235.11.2 uas="User-Agent" 1520425086.411 chi=34.245.117.91 phn=tvgbzcdnes02 php=80 shn=176.235.11.2 url=http://tvgbztcdnes02.channels.turkcelltvplus.com.tr/Fashionbox/20180125T023356-06-357677.ts cqhm=GET cqhv=HTTP/1.1 pssc=200 ttms=40020 b=665896 sssc=200 sscl=665896 cfsc=FIN pfsc=FIN crc=TCP_MISS phr=DIRECT pqsn=176.235.11.2 uas="User-Agent" 1520425086.414 chi=34.253.239.40 phn=tvgbzcdnes02 php=80 shn=176.235.11.2 url=http://tvgbztcdnes02.channels.turkcelltvplus.com.tr/Fashionbox/20180125T023356-06-357677.ts cqhm=GET cqhv=HTTP/1.1 pssc=200 ttms=40150 b=665896 sssc=200 sscl=665896 cfsc=FIN pfsc=FIN crc=TCP_MISS phr=DIRECT pqsn=176.235.11.2 uas="User-Agent" 1520425086.421 chi=34.243.255.27 phn=tvgbzcdnes02 php=80 shn=176.235.11.2 url=http://tvgbztcdnes02.channels.turkcelltvplus.com.tr/Fashionbox/20180125T023356-06-357677.ts cqhm=GET cqhv=HTTP/1.1 pssc=200 ttms=40176 b=665896 sssc=200 sscl=665896 cfsc=FIN pfsc=FIN crc=TCP_MISS phr=DIRECT pqsn=176.235.11.2 uas="User-Agent" 1520425086.427 chi=34.249.94.171 phn=tvgbzcdnes02 php=80 shn=176.235.11.2 url=http://tvgbztcdnes02.channels.turkcelltvplus.com.tr/Fashionbox/20180125T023356-06-357677.ts cqhm=GET cqhv=HTTP/1.1 pssc=200 ttms=40083 b=665896 sssc=200 sscl=665896 cfsc=FIN pfsc=FIN crc=TCP_MISS phr=DIRECT pqsn=176.235.11.2 uas="User-Agent" 1520425086.428 chi=52.48.159.168 phn=tvgbzcdnes02 php=80 shn=176.235.11.2 url=http://tvgbztcdnes02.channels.turkcelltvplus.com.tr/Fashionbox/20180125T023356-06-357677.ts cqhm=GET cqhv=HTTP/1.1 pssc=200 ttms=40028 b=665896 sssc=200 sscl=665896 cfsc=FIN pfsc=FIN crc=TCP_MISS phr=DIRECT pqsn=176.235.11.2 uas="User-Agent" 1520425086.431 chi=54.246.245.203 phn=tvgbzcdnes02 php=80 shn=176.235.11.2 url=http://tvgbztcdnes02.channels.turkcelltvplus.com.tr/Fashionbox/20180125T023356-06-357677.ts cqhm=GET cqhv=HTTP/1.1 pssc=200 ttms=38984 b=665896 sssc=200 sscl=665896 cfsc=FIN pfsc=FIN crc=TCP_MISS phr=DIRECT pqsn=176.235.11.2 uas="User-Agent" 1520425086.435 chi=34.249.44.167 phn=tvgbzcdnes02 php=80 shn=176.235.11.2 url=http://tvgbztcdnes02.channels.turkcelltvplus.com.tr/Fashionbox/20180125T023356-06-357677.ts cqhm=GET cqhv=HTTP/1.1 pssc=200 ttms=40103 b=665896 sssc=200 sscl=665896 cfsc=FIN pfsc=FIN crc=TCP_MISS phr=DIRECT pqsn=176.235.11.2 uas="User-Agent" 1520425086.435 chi=54.171.125.63 phn=tvgbzcdnes02 php=80 shn=176.235.11.2 url=http://tvgbztcdnes02.channels.turkcelltvplus.com.tr/Fashionbox/20180125T023356-06-357677.ts cqhm=GET cqhv=HTTP/1.1 pssc=200 ttms=37816 b=665896 sssc=200 sscl=665896 cfsc=FIN pfsc=FIN crc=TCP_MISS phr=DIRECT pqsn=176.235.11.2 uas="User-Agent" 1520425086.435 chi=54.171.125.63 phn=tvgbzcdnes02 php=80 shn=176.235.11.2 url=http://tvgbztcdnes02.channels.turkcelltvplus.com.tr/Fashionbox/20180125T023356-06-357677.ts cqhm=GET cqhv=HTTP/1.1 pssc=200 ttms=40198 b=665896 sssc=200 sscl=665896 cfsc=FIN pfsc=FIN crc=TCP_MISS phr=DIRECT pqsn=176.235.11.2 uas="User-Agent" Thanks & kind regards, Burak [http://www.turkcell.com.tr/downloads/bireysel/img/Tcelldis.gif] 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