[broker] Add health check callbacks for tenant tags and routing readiness #17580
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This change ensures that broker health checks take tenant tags and routing readiness into account before reporting the broker as healthy. Two new ServiceStatusCallback implementations are added: - TenantTagReadinessCallback: Verifies the broker has valid tenant tags (not just broker_untagged) - RoutingReadinessCallback: Verifies routing exists for all assigned tables This addresses a production issue where queries could be routed to brokers that were not yet ready to serve traffic, causing query failures. The callbacks are registered before the IdealState/ExternalView match callbacks, with TenantTagReadinessCallback preceding RoutingReadinessCallback since an untagged broker has no tables assigned.
suvodeep-pyne
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Codecov Report✅ All modified and coverable lines are covered by tests.
Additional details and impacted files@@ Coverage Diff @@
## master #17580 +/- ##
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- Coverage 63.21% 55.52% -7.70%
+ Complexity 1476 709 -767
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Files 3172 2476 -696
Lines 189806 140012 -49794
Branches 29046 22318 -6728
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- Hits 119987 77735 -42252
+ Misses 60508 55725 -4783
+ Partials 9311 6552 -2759
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Summary
TenantTagReadinessCallbackto verify broker has valid tenant tags (not justbroker_untagged)RoutingReadinessCallbackto verify routing exists for all assigned tables before reporting healthyBaseBrokerStarter.registerServiceStatusHandler()with documented ordering dependencyBackground
This addresses a production issue where queries could be routed to brokers that were not yet ready to serve traffic, causing query failures. The root cause is that the existing health check only validates Helix state convergence but doesn't verify:
Test plan
TenantTagReadinessCallback(4 tests)RoutingReadinessCallback(6 tests including IdealState API verification)HelixBrokerStarterTest