lzx404243 commented on code in PR #9620:
URL: https://github.com/apache/trafficserver/pull/9620#discussion_r1175923085
##########
proxy/http/HttpTransact.h:
##########
@@ -944,7 +944,22 @@ class HttpTransact
MgmtInt
configured_connect_attempts_max_retries() const
{
- return txn_conf->connect_attempts_max_retries;
+ if (dns_info.looking_up != ResolveInfo::PARENT_PROXY) {
+ return txn_conf->connect_attempts_max_retries;
+ }
+ // For parent proxy, return the maximum attempt count for the current
+ // parent intead of the global max retries for the whole parent group.
+ // The max attempt count for the current parent is calculated by rounding
+ // the current attempt up to next multiple of ppca.
+ auto ppca = txn_conf->per_parent_connect_attempts;
+ auto cur_attempts = current.attempts.get();
+ auto cur_parent_max_attempts = ((cur_attempts + ppca - 1) / ppca) * ppca;
+ if (cur_attempts == cur_parent_max_attempts) {
+ // If the current attempt is already a multiple of ppca, get the next
+ // multiple.
+ cur_parent_max_attempts += ppca;
+ }
Review Comment:
Without this, when `cur_attempts` is already a multiple of `ppca` when
calling this function, the calculation would always return the same
`cur_attempts`, which leads to an assertion error in `increment()` down the
line.
I do see your point though and we don't want to skip parents. Question: when
`cur_attempts` is 20, is it the last try for the second origin, or is it the
first try for the last origin?
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