fix(limits): Set ready when all partitions ready #18092
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This commit moves the partition readiness check after the service and lifecycler readiness checks. It does this because the partition readiness check cannot pass until the consumer is running, and the consumer.Run() goroutine is not started until running() is called. That means it makes sense to check the service state and the lifecycler before checking the partitions.
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This commit fixes a race condition where the maximum attempts is never satisifed. This race condition comes about as two (or more) goroutines can load and increment the atomic concurrently, which would cause the next Load() to load a value greater than the maximum number of attempts, breaking the equality check.
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This commit fixes the race condition that exists between two (or more) goroutines concurrently executing CheckReady. What can happen is both goroutines call Load at the same time, do the check, and then increment the number of attempts without using check-and-set. This allowed the number of attempts to exceed the maximum number of attempts.
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| // The maximum amount of time to wait to join the consumer group and be | ||
| // assigned some partitions before giving up and going ready in | ||
| // [Service.CheckReady]. | ||
| partitionReadinessWaitAssignPeriod = 30 * time.Second |
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I changed this so now the time that we wait is independent of:
- The readiness check interval
- The number of clients calling
/ready
grobinson-grafana
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What this PR does / why we need it:
This pull request makes the ingest-limits readiness handler to consider partition state before signaling ready. I.e. the service is considered to be ready and consume traffic when the following conditions apply:
Which issue(s) this PR fixes:
Fixes #grafana/loki-private/issues/1722
Special notes for your reviewer:
Checklist
CONTRIBUTING.mdguide (required)featPRs are unlikely to be accepted unless a case can be made for the feature actually being a bug fix to existing behavior.docs/sources/setup/upgrade/_index.mddeprecated-config.yamlanddeleted-config.yamlfiles respectively in thetools/deprecated-config-checkerdirectory. Example PR