[backport -> release/3.5.x] fix(balancer): respect max retries (#12346) #12383
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In the balancer phase, when obtaining a connection from the upstream connection pool, the `cached` attribute of the peer connection is set to 1(`pc->cached = 1;`), indicating that the connection is obtained from the cache. If an error occurs during the use of this connection, such as "upstream prematurely closed connection" the system will increase the `tries` attribute of the peer connection by executing `u->peer.tries++`. `tries` represents the maximum number of attempts to connect to an upstream server. It is equal to the normal 1 attempt + `retries` (default value is 5) = 6. The occurrence of `u->peer.tries++` is unexpected and it results in the actual retry count exceeding 6 in worst cases. This PR restores tries by callbacks to the balancer when `u->peer.tries++` is unexpectedly set. FIX [FTI-5616](https://konghq.atlassian.net/browse/FTI-5616) Signed-off-by: tzssangglass <[email protected]>
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Summary
this is a backport form #12346
Checklist
changelog/unreleased/kongorskip-changeloglabel added on PR if changelog is unnecessary. README.mdIssue reference
FIX FTI-5616