3/6 Add OtlpParamSource for OTLP corpora#2136
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The ApiError handler in execute_single() decodes `e.body`, `e.error`, and `e.info` as UTF-8 to build a human-readable error message. When the body is binary (e.g., binary protobuf returned by ES OTLP endpoints on 4xx/5xx), the strict decode raises UnicodeDecodeError, which crashes the worker mid-task. Switch the six decode() calls to use errors="replace" so undecodable bytes become U+FFFD instead of aborting the worker. No semantic change for valid UTF-8 (the common case). This is a latent bug independent of OTLP — any operation that surfaces a binary error body would have hit it.
Introduces OtlpProtobufFile in esrally/utils/io.py for reading/writing length-prefixed OTLP ExportMetricsServiceRequest protobufs, plus an offset sidecar to allow worker partitions to seek without scanning. Wires preparation into esrally/track/loader.py and esrally/track/track.py: - New OTLP document set fields (otlp_pb_size_in_bytes, etc.) - prepare_otlp_document_set tries to download a .pb from the corpus base URL, otherwise converts a local JSON corpus to .pb on disk. - set_absolute_data_path picks up the .pb when present. Adds OTLP protobuf bindings to pyproject.toml (opentelemetry-proto). Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
OtlpParamSource streams length-prefixed protobuf records out of an OtlpProtobufFile, partitions them across workers using the offset sidecar, and surfaces percent_completed so the progress bar tracks real progress. Supports a "looped" mode that cycles the partition indefinitely for time-bound benchmarks. Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
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This was referenced May 29, 2026
gareth-ellis
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This was referenced May 29, 2026
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Summary
Adds
OtlpParamSourceinesrally/track/params.py— the parameter source that drives OTLP ingest operations.OtlpProtobufFilerather than materializing into memory (a 1 MB-per-record corpus with 6k records per partition would otherwise consume 6+ GB per worker).percent_completedso Rally's progress bar tracks real progress.loopedmode that cycles the partition indefinitely for time-bound benchmarks.corporaoperation param so a track with multiple OTLP corpora can target a specific one.Depends on #2135 — merge after #2135. Part 3 of 6.
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