Hi, I believe background fill is enabled and tuned correctly for RWW.
we are trying to simulate the REFRESH MISS problem using a small local setup. we used 3 docker containers running on a single 4 core Intel Xeon CPU E3-1220 v5 @ 3.00GHz machine as follows: 1) nginx origin using image nginx:alpine 2) ATS (built inside a container) 3) load using apache2-utils installed inside container python:3.7-alpine inside the "load container" we run ab as follows: ab -k -n 500000 -c 4000 <url> and sometimes we see one or 2 failed requests. we didn't find any 5XX response in the ATS logs. for every failed request reported by ab , we found 2 corresponding log lines in ATS , a TCP_MISS_REDIRECT and a ERR_CONNECT_FAIL both with 303 response code "res_size_": "0", "origin_response_code_": "000", "response_code_": "303", "response_time_": "7", "duration_": "0", "req_size_": "205", "proxy_req_sz_": "377", "time_": "1593015615.000", "url_": "http://ut-ats/collapse_fw/video/250kbit/seq-91.ts?test=527";, "orig_duration_": "0", "origin_": "ut-ngxorg", "origin_resp_sz_": "0", "heirarchy_": "DIRECT", "crc": "TCP_MISS_REDIRECT" "res_size_": "550","origin_response_code_": "000", "response_code_": "303", "response_time_": "22", "duration_": "38", "req_size_": "155", "proxy_req_sz_": "0", "time_": "1593015615.000", "url_": "http://ut-ats/collapse_fw/video/250kbit/seq-91.ts?test=527";, "orig_duration_": "0", "origin_": "ut-ats", "origin_resp_sz_": "0", "heirarchy_": "DIRECT", "crc": "ERR_CONNECT_FAIL" -------------------------------------------------------------------------------- NGINX origin configuration: we only added "max-age=1" header in the location section inside /etc/nginx/conf.d/default.conf and we ran a simple loop in the shell to touch the file that we are fetching every 1 second location / { root /usr/share/nginx/html; index index.html index.htm; add_header Cache-Control "max-age=1, public"; } -------------------------------------------------------------------------------- ATS configuration: proxy.config.http.cache.open_write_fail_action 4 proxy.config.cache.enable_read_while_writer 1 proxy.config.http.redirection_enabled 1 proxy.config.http.number_of_redirections 10 proxy.config.http.redirect_use_orig_cache_key 1 proxy.config.http.background_fill_active_timeout 0 proxy.config.http.background_fill_completed_threshold 0 proxy.config.cache.max_doc_size 0 proxy.config.cache.read_while_writer.max_retries 10 proxy.config.cache.read_while_writer_retry.delay 50 proxy.config.http.cache.max_open_read_retries 5 proxy.config.http.cache.open_read_retry_time 10 proxy.config.http.wait_for_cache 1 proxy.config.http.cache.max_open_write_retries 1 map http://ut-ats/collapse_fw/ http://ut-ngxorg/assets/ @plugin=collapsed_forwarding.so @pparam=--delay=20 @pparam=--retries=2 -------------------------------------------------------------------------------- BR, Erez -- Sent from: http://apache-traffic-server.24303.n7.nabble.com/
