Memoize tagset cursor's key #3676
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CPU profiling shows that computing the tagset-based key of each point is significant CPU cost. These keys actually don't change per cursor, so precompute once at mapper-open time, and then use those values as points are drained from the cursor. Before this change the cursor tag was getting computed on every point, which involved marshalling tags.
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+1, great find! |
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+1 |
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CPU profiling shows that computing the tagset-based key of each point is significant CPU cost (
formMeasurementTagSetKey). These keys actually don't change per cursor, so precompute per tagset cursor, and then tack this value onto mapper outputs.Before this change the cursor tagset-based key was getting computed for every point emitted by that cursor, which involved marshalling tags ever time a point was emitted.
With this change in place, on my machine, a partner's test query execution time was reduced by 30-40%.