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Travis Patterson 9d20bed26a Short circuit parsers (#8724) ... In many cases we only need a few labels from a line. Because most of our parsers parse lines incrementally, we can stop parsing a line after we have all the labels we want from it. This pr uses `ParserHints` to keep track of the number of extracted labels. It also provides a way for parsers to know when they should stop parsing. Notes: - parsers had inconsistent ordering between the `ShouldExtract` call and adding the `_extracted` label to duplicates. This PR makes appending `_extracted` always happen before `ShouldExtract` to keep counts of what is extracted compared to expected labels consistent. Next Steps: - When the user specifies a query with a grouping containing the `_extracted` label but there is no duplicate between the passed line and labels, short circuiting will not work. I'll address this in a follow up PR. Benchmarks: To try and show a balanced view of what this buys us, this pr picks a label our of the middle of a line. In a best case this might be much better. In the worst case, we have to parse the whole line. ``` benchstat short_circuit_old.txt short_circuit_new.txt name old time/op new time/op delta KeyExtraction/json-8 456ns ± 3% 256ns ± 2% -43.84% (p=0.000 n=9+10) KeyExtraction/logfmt-8 347ns ± 4% 171ns ± 2% -50.86% (p=0.000 n=10+10) KeyExtraction/logfmt-expression-8 552ns ± 2% 368ns ± 2% -33.23% (p=0.000 n=9+10) name old alloc/op new alloc/op delta KeyExtraction/json-8 5.00B ± 0% 5.00B ± 0% ~ (all equal) KeyExtraction/logfmt-8 5.00B ± 0% 5.00B ± 0% ~ (all equal) KeyExtraction/logfmt-expression-8 16.0B ± 0% 16.0B ± 0% ~ (all equal) name old allocs/op new allocs/op delta KeyExtraction/json-8 1.00 ± 0% 1.00 ± 0% ~ (all equal) KeyExtraction/logfmt-8 1.00 ± 0% 1.00 ± 0% ~ (all equal) KeyExtraction/logfmt-expression-8 2.00 ± 0% 2.00 ± 0% ~ (all equal) ``` --------- Co-authored-by: J Stickler <julie.stickler@grafana.com>		3 years ago
..
_index.md	Short circuit parsers (#8724)	3 years ago
query_components.png	Fix documentation linter errors (#8229)	3 years ago