rob05c commented on issue #2876: TM hangs with missing profile parameter URL: https://github.com/apache/trafficcontrol/issues/2876#issuecomment-524923096 In case anyone is reading this in the future: 2921 doesn't actually fix this. 2921 fixes the Monitor to keep retrying Traffic Ops, if it fails in the initial startup, as far as I can tell it's completely unrelated. But, this shouldn't be "fixed." The Monitor very intentionally does not start, and serves a 501 for all endpoints (besides the .html), until it has polled every cache. This is to prevent the Monitor from giving bad data to the Router, mid-startup, and saying caches are down when they aren't. If it were "fixed" to start before all caches had been polled, it would potentially give bad data to the Router. So, the Monitor _should_ hang and refuse to start, if any cache's profile is missing the polling URL. And it does log the reason, that the URL is missing.
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