lease: rate limit revoke runLoop #8099
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gyuho
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etcdserver/server.go
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| } | ||
| revokerLimiter.Wait(context.Background()) |
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Should we use c.ctx instead of the context.Background()? and if Wait returns an error, how should we handle it?
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Wait won't never return error if we pass Background, unless we mis-configure in the beginning
etcdserver/server.go
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| } | ||
| revokerLimiter.Wait(context.Background()) | ||
| lid := lease.ID | ||
| s.goAttach(func() { |
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maxPendingRevokes is designed to take at most maxPendingRevokes(16 in this case) lease revoke at same time. By removing that, it means that there can be 1000 go routines that revoking the lease at the same time. Is that fine? I think the original design was to limit number of simultaneous revokes call to etcd.
etcdserver/server.go
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| maxPendingRevokes = 16 | ||
| // TODO: make this configurable? | ||
| // maximum number of leases to revoke per second | ||
| leaseRevokeRate = 1000 |
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leaseRevokesPerSecond?
etcdserver/server.go
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| } | ||
| revokerLimiter.Wait(context.Background()) |
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this rate limiting probably belongs in lessor.runLoop instead of the etcd server
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gyuho
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lease/lessor.go
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| @@ -412,7 +419,8 @@ func (le *lessor) Stop() { | |||
| func (le *lessor) runLoop() { | |||
| defer close(le.doneC) | |||
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| for { | |||
| revokerLimiter := rate.NewLimiter(rate.Limit(leaseRevokesPerSecond), leaseRevokesPerSecond) | |||
| for revokerLimiter.Wait(context.Background()) == nil { | |||
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I don't think this will work since findExpiredLeases can give len(ls) > leaseRevokesPerSecond. Maybe just have something like if len(ls) > leaseRevokesPerSecond/2 { ls = ls[:leaseRevokesPerSecond/2]} before posting to expiredC?
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lease/lessor.go
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| @@ -422,6 +426,10 @@ func (le *lessor) runLoop() { | |||
| le.mu.Unlock() | |||
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| if len(ls) != 0 { | |||
| // keep half for next iteration | |||
Fix etcd-io#8097. Signed-off-by: Gyu-Ho Lee <gyuhox@gmail.com>
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lgtm |
Fix #8097.