additional improve MetricSnapshots.Builder performance #985
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Signed-off-by: Andrey Burov <[email protected]>
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dhoard
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Sep 19, 2024
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@burov4j thanks for the PR! |
This was referenced Oct 15, 2024
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The function
io.prometheus.metrics.model.registry.PrometheusRegistry.scrapehas O(n^2) complexity: higher size of the listmultiCollectorsgenerates higher amount ofsnapshotsin theio.prometheus.metrics.model.snapshots.MetricSnapshots.Builderclass on each loop iteration.Because of this we have x100 times slower metrics scrape in our project on production.
This PR gave us good performance improvement: #963
But it's not enough, because the complexity is still O(n^2). The current PR resolves the performance issue.