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This was referenced Dec 21, 2023
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mdisibio
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Jan 11, 2024
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| func (f *SpansetFilter) evaluate(input []*Spanset) ([]*Spanset, error) { | ||
| f.outputBuffer = f.outputBuffer[:0] | ||
| var outputBuffer []*Spanset |
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This change is required to make the traceql eval callback safe for concurrent use (so we can execute the query against multiple blocks in parallel). This was ok previously because: regular searches were single threaded or the query was compiled for each block and they got their own AST (and SpansetFilters). But now for metrics the AST keeps more state and it should be more efficient to reuse the same AST across all blocks. Otherwise it would have to create and squash repeatedly the same timeseries from each block to get the final results.
zalegrala
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Jan 11, 2024
mdisibio
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Jan 11, 2024
… on first error and cancel any remaining work
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What this PR does:
This is the result of a collaboration effort and requires #3227 for the underlying work of providing the data. Here we build out the API for metrics in Tempo.
Notes
This is one entry in a set of chained PRs. The full body of work has been split into separate buckets to make reviews and updates more manageable.
Checklist
CHANGELOG.mdupdated - the order of entries should be[CHANGE],[FEATURE],[ENHANCEMENT],[BUGFIX]