store: add histogram for postings size #5814
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Add a metric that shows the distribution of how many postings (in bytes) were needed for each Series() call. Useful for determining limits. Signed-off-by: Giedrius Statkevičius <giedrius.statkevicius@vinted.com>
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fpetkovski
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matej-g
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| @@ -1137,6 +1146,7 @@ func (s *BucketStore) Series(req *storepb.SeriesRequest, srv storepb.Store_Serie | |||
| s.metrics.cachedPostingsCompressionTimeSeconds.WithLabelValues(labelDecode).Add(stats.CachedPostingsDecompressionTimeSum.Seconds()) | |||
| s.metrics.cachedPostingsOriginalSizeBytes.Add(float64(stats.CachedPostingsOriginalSizeSum)) | |||
| s.metrics.cachedPostingsCompressedSizeBytes.Add(float64(stats.CachedPostingsCompressedSizeSum)) | |||
| s.metrics.postingsSizeBytes.Observe(float64(int(stats.PostingsFetchedSizeSum) + int(stats.PostingsTouchedSizeSum))) | |||
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@GiedriusS: Am I correct in assuming that "touched" means downloaded from cache and "fetched" means downloaded from object storage? Seems like so but I am not sure. 🤔
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One thing to note is that, we also update PostingsTouchedSizeSum when we write encoded postings back to cache even if we fetch those postings from object storage. I feel like this behavior makes the metric not that accurate.
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I think this deserves fixing and its own issue, @yeya24. WDYT?
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Yeah I don't know if this is by design. @GiedriusS Do you know more about this
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@GiedriusS thanks a lot for this. 🙇 |
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Add a metric that shows the distribution of how many postings (in bytes) were needed for each Series() call. Useful for determining limits. Signed-off-by: Giedrius Statkevičius <giedrius.statkevicius@vinted.com> Signed-off-by: Giedrius Statkevičius <giedrius.statkevicius@vinted.com>
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Add a metric that shows the distribution of how many postings (in bytes) were needed for each Series() call. Useful for determining limits. Signed-off-by: Giedrius Statkevičius <giedrius.statkevicius@vinted.com> Signed-off-by: Giedrius Statkevičius <giedrius.statkevicius@vinted.com>
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Add a metric that shows the distribution of how many postings (in bytes) were needed for each Series() call. Useful for determining limits.
Signed-off-by: Giedrius Statkevičius giedrius.statkevicius@vinted.com