wklken commented on issue #10093:
URL: https://github.com/apache/apisix/issues/10093#issuecomment-1724758087
More clues for detecting:
1. should be `route.upstream`, and the `route` should related to a `service`
with `upstream` will cause the problem
- route without upstream - ok
- route with upstream, without service_id - ok
2. 4 workers, only part of them will return 503
3. if `apisix reload`, will all 200
4. the `503` only 1 log `2023/09/19 02:34:52 [error] 854#854: *112694 [lua]
init.lua:486: handle_upstream(): failed to set upstream: no valid upstream
node, client: 172.31.0.1, server: _, request: "GET /api/test/prod/dns22
HTTP/1.1", host: "0.0.0.0:9080"`; it did not call the `parse_domain`, maybe
some cache?
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