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Ruler: Add update label names routine for stateful ruler #6689

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Sep 1, 2023
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Ruler: Add update label names routine for stateful ruler #6689

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15 changes: 15 additions & 0 deletions cmd/thanos/rule.go
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Original file line number Diff line number Diff line change
Expand Up @@ -642,6 +642,21 @@ func runRule(
)
storeServer := store.NewLimitedStoreServer(store.NewInstrumentedStoreServer(reg, tsdbStore), reg, conf.storeRateLimits)
options = append(options, grpcserver.WithServer(store.RegisterStoreServer(storeServer, logger)))

ctx, cancel := context.WithCancel(context.Background())
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is there a reason we dont use top level context + cancel for all the concurrent routines? I was wondering yesterday; if some top one fails this one wont be canceled.

I would move ctx, cancel to top i think.

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I was wrong about the context. The cancellation is handled by the run.Group invoking the interrupt function passed to g.Add, which means that this is canceling its own context which has correct semantics i think.
Having said that, run.Group is not very context friendly i think.

level.Debug(logger).Log("msg", "setting up periodic update for label names")
g.Add(func() error {
return runutil.Repeat(10*time.Second, ctx.Done(), func() error {
level.Debug(logger).Log("msg", "Starting label names update")

tsdbStore.UpdateLabelNames(ctx)

level.Debug(logger).Log("msg", "Finished label names update")
return nil
})
}, func(err error) {
cancel()
})
}

options = append(options, grpcserver.WithServer(
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