metrics: add loading region cache duration#502
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sticnarf merged 3 commits intotikv:masterfrom May 16, 2022
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Signed-off-by: you06 <you1474600@gmail.com>
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Signed-off-by: you06 <you1474600@gmail.com>
Signed-off-by: you06 <you1474600@gmail.com>
sticnarf
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May 16, 2022
TonsnakeLin
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Jun 20, 2022
| } else { | ||
| reg, err = c.pdClient.GetRegion(ctx, key, pd.WithBuckets()) | ||
| } | ||
| metrics.LoadRegionCacheHistogramWhenCacheMiss.Observe(time.Since(start).Seconds()) |
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LoadRegionCacheHistogramWhenCacheMiss observes the time for every round of getting region cache from PD. It is meaningful.
Do we need observe the total backoff time of getting region cache? The total time may be more clearly for users.
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Users may have interest in the total loading region cache time, and I think such time can be recorded in execution details and printed in slow log.
Because loading region cache can be concurrent, the total time does not stand for the wall time. I don't think it's a clear metric.
| } | ||
| start := time.Now() | ||
| reg, err := c.pdClient.GetRegionByID(ctx, regionID, pd.WithBuckets()) | ||
| metrics.LoadRegionCacheHistogramWithRegionByID.Observe(time.Since(start).Seconds()) |
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Signed-off-by: you06 you1474600@gmail.com
This PR record the latency when loading the region cache.