feat: compute deterministic timeseries_id column at ingest#6286
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g-talbot wants to merge 3 commits intogtt/parquet-column-orderingfrom
Open
feat: compute deterministic timeseries_id column at ingest#6286g-talbot wants to merge 3 commits intogtt/parquet-column-orderingfrom
g-talbot wants to merge 3 commits intogtt/parquet-column-orderingfrom
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Add a timeseries_id column (Int64) to the metrics Arrow batch, computed as a SipHash-2-4 of the series identity columns (metric_name, metric_type, and all tags excluding temporal/value columns). The hash uses fixed keys for cross-process determinism. The column is already declared in the metrics default sort schema (between host and timestamp_secs), so the parquet writer now automatically sorts by it and places it in the correct physical position. Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
The timeseries_id hash is persisted to Parquet files — any change
silently corrupts compaction and queries. Add:
- 3 pinned stability tests with hardcoded expected hash values
- 3 proptest properties (order independence, excluded tag immunity,
extra-tag discrimination) each running 256 random cases
- Boundary ambiguity test ({"ab":"c"} vs {"a":"bc"})
- Same-series-different-timestamp invariant test
- All-excluded-tags coverage (every EXCLUDED_TAGS entry verified)
- Edge cases: empty strings, unicode, 100-tag cardinality
- Module-level doc explaining the stability contract
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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Summary
timeseries_idcolumn (Int64) to the metrics Arrow batch, computed as a deterministic SipHash-2-4 of the series identity columnsmetric_name,metric_type, and all tags — excludes temporal columns (timestamp_secs,start_timestamp_secs,timestamp) and value columns (value, plus DDSketch components from [metrics] Support DDSketch in the parquet pipeline #6257:count,sum,min,max,flags,keys,counts)metric_name|service|env|datacenter|region|host|timeseries_id|timestamp_secs/V2), so the writer automatically sorts by it and places it in the correct physical positionTimeseriesIdvariant toParquetFieldenum and updatesSORT_ORDERDesign reference
Sorted Series Column for QW Parquet Pipeline — this PR implements the Timeseries ID component; the full Sorted Series composite key is a follow-up.
Test plan
compute_timeseries_id(determinism, exclusions, order independence, key/value non-interchangeability)quickwit-parquet-engineandquickwit-opentelemetrypass with updated column countsreorder_columnsnot introduced by this PR)🤖 Generated with Claude Code