Vgutierrez added a comment.
From ATS source code, it looks like ATS logs connect errors on the first
attempt but it's configured to perform 3 attempts, so a log line indicating a
connection error isn't the same as a 502 iff the request is retryable:
//////////////////////////////////////////
// on the first connect attempt failure //
// record the failue //
//////////////////////////////////////////
if (0 == s->current.attempts) {
Log::error("CONNECT:[%d] could not connect [%s] to %s for '%s'",
s->current.attempts,
HttpDebugNames::get_server_state_name(conn_state),
ats_ip_ntop(&s->current.server->dst_addr.sa, addrbuf,
sizeof(addrbuf)), url_string ? url_string : "<none>");
}
vgutierrez@cp1075:/var/log/trafficserver$ sudo -i traffic_ctl config match
connect_attempts_max_retries
proxy.config.http.connect_attempts_max_retries: 3
proxy.config.http.connect_attempts_max_retries_dead_server: 1
TASK DETAIL
https://phabricator.wikimedia.org/T237319
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To: Vgutierrez
Cc: Vgutierrez, ema, Nikerabbit, DannyS712, Aklapper, darthmon_wmde, abi_,
Legado_Shulgin, Nandana, Davinaclare77, Qtn1293, Techguru.pc, Lahi, Gq86,
GoranSMilovanovic, Th3d3v1ls, Hfbn0, QZanden, LawExplorer, Zppix, _jensen,
rosalieper, Taiwania_Justo, Scott_WUaS, Wong128hk, Wikidata-bugs, aude, faidon,
KartikMistry, Mbch331, Rxy, Jay8g, fgiunchedi
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