fastotel
A Rust-backed drop-in for the OpenTelemetry Python SDK that takes tracing overhead off the request path.
Status: pre-alpha.
OTLPSpanProcessorsends every field of a span over OTLP/HTTP, encoded asOTLPSpanExporterencodes it, configured as it is configured, and batches asBatchSpanProcessordoes, but with no retries, gzip or custom TLS yet, and a process forked after the first span exports nothing from the child. The road to 1.0 is in #5.
Why
Instrumentation packages (FastAPI, httpx, SQLAlchemy, aiokafka, …) depend only on opentelemetry-api.
fastotel replaces parts of opentelemetry-sdk behind that API, so existing instrumentation keeps working.
In the pure-Python SDK, the BatchSpanProcessor worker thread encodes OTLP protobuf, gzips and sends spans
while holding the GIL, so it competes for CPU with request handling. In Rust, batching, encoding, compression
and export run on a thread that never takes the GIL.
Installation
pip install fastotel
Wheels are built for Linux (glibc and musl), macOS and Windows, x86_64 and arm64:
| Python | Wheel | Tested in CI |
|---|---|---|
| CPython 3.11, 3.12, 3.13, 3.14 | one abi3 wheel per platform, which also covers later versions |
yes |
| CPython 3.14t, free-threaded | cp314t; the GIL stays off after import |
yes |
| CPython 3.15 (pre-release) | the abi3 wheel |
yes |
| CPython 3.15t (pre-release) | none yet: builds from the sdist; a wheel ships with 3.15.0 | yes, from source |
CPython 3.10 reached end of life on 2026-10-01 and is not supported. Free-threaded 3.13t is not supported either: it was experimental, and PyO3 builds free-threaded extensions from 3.14 on.
Usage
fastotel replaces BatchSpanProcessor with OTLPSpanExporter; the SDK keeps creating spans:
from opentelemetry import trace
from opentelemetry.sdk.trace import TracerProvider
from fastotel import OTLPSpanProcessor
provider = TracerProvider()
provider.add_span_processor(OTLPSpanProcessor()) # reads OTEL_EXPORTER_OTLP_* and OTEL_BSP_*
trace.set_tracer_provider(provider)
on_end copies the span into Rust and returns; a native thread, started by the first span, batches,
encodes and sends spans without taking the GIL. As with BatchSpanProcessor, only sampled spans are exported. The
requests decode to what OTLPSpanExporter sends for the same spans; where they differ is in
ADR 0003.
Exporter
The arguments and variables of OTLPSpanExporter (opentelemetry-exporter-otlp-proto-http), with its defaults,
precedence and parsing: an argument overrides the OTEL_EXPORTER_OTLP_TRACES_* variable, which overrides the
OTEL_EXPORTER_OTLP_* one; an empty variable counts as unset. A timeout or a compression that does not parse gives
the default, and a header entry that does not parse is skipped, each with the reference's warning on the
fastotel logger.
| Argument | Variables | Default | What it does |
|---|---|---|---|
endpoint |
OTEL_EXPORTER_OTLP_TRACES_ENDPOINT, as it is; OTEL_EXPORTER_OTLP_ENDPOINT, with /v1/traces appended |
http://localhost:4318/v1/traces |
the URL spans are posted to; the argument, like the traces variable, includes the path |
headers |
OTEL_EXPORTER_OTLP_TRACES_HEADERS, OTEL_EXPORTER_OTLP_HEADERS |
Content-Type: application/x-protobuf, User-Agent: fastotel/<version> |
sent with every request; a variable holds name=value pairs separated by commas, URL-encoded (Authorization=Basic%20dXNlcg%3D%3D); names are lower-cased, and the argument's headers are merged over the variable's |
timeout |
OTEL_EXPORTER_OTLP_TRACES_TIMEOUT, OTEL_EXPORTER_OTLP_TIMEOUT |
10 | seconds a request may take |
compression |
OTEL_EXPORTER_OTLP_TRACES_COMPRESSION, OTEL_EXPORTER_OTLP_COMPRESSION |
none |
gzip, deflate or none; the argument is the reference's Compression or a string. Read, but requests are not compressed before #11 |
certificate_file |
OTEL_EXPORTER_OTLP_TRACES_CERTIFICATE, OTEL_EXPORTER_OTLP_CERTIFICATE |
the OS trust store | the CA to verify the collector with. Read, but applied from #11 |
client_certificate_file |
OTEL_EXPORTER_OTLP_TRACES_CLIENT_CERTIFICATE, OTEL_EXPORTER_OTLP_CLIENT_CERTIFICATE |
none | the client certificate for mTLS. Read, but applied from #11 |
client_key_file |
OTEL_EXPORTER_OTLP_TRACES_CLIENT_KEY, OTEL_EXPORTER_OTLP_CLIENT_KEY |
none | its key, used only with a client certificate. Read, but applied from #11 |
OTLPSpanExporter's session, max_request_size and meter_provider, and its credential provider variables,
have no counterpart. Where fastotel differs from the reference (its own user agent, a header that HTTP cannot
carry raises ValueError, compression also takes a string) is in
ADR 0005.
Batching
The arguments and variables of BatchSpanProcessor, with its defaults, parsing and checks: an argument overrides
its variable, a variable that is not an integer gives the default and an error log on the fastotel logger, and a
value out of range raises ValueError from the constructor.
| Argument | Variable | Default | What it does |
|---|---|---|---|
max_queue_size |
OTEL_BSP_MAX_QUEUE_SIZE |
2048 | spans waiting for export; a span ended while the queue is full is dropped and counted (the count is public with #14), and on_end never blocks |
max_export_batch_size |
OTEL_BSP_MAX_EXPORT_BATCH_SIZE |
512 | a batch leaves as soon as it is full; at most max_queue_size |
schedule_delay_millis |
OTEL_BSP_SCHEDULE_DELAY |
5000 | otherwise, what is queued leaves this long after the previous export |
export_timeout_millis |
OTEL_BSP_EXPORT_TIMEOUT |
30000 | how long shutdown() waits for the last export |
Where this differs from BatchSpanProcessor (a full queue drops the newest span rather than the oldest, among
others) is in ADR 0004.
Development
Needs uv and a Rust toolchain (rustup).
make install # build the extension, install the dev dependencies
make test # run the tests, those of the Rust export pipeline (crates/export) too
make lint # ruff, mypy, cargo fmt, clippy
make bench # what the stock SDK costs an application, on a GIL and a free-threaded build (~30 min)
Every change that reaches master is a release: a pull request bumps the version in pyproject.toml
(uv version --bump patch) and adds its section to CHANGELOG.md.
License
1 maintainer
Metadata
1 maintainer
Release files for fastotel 0.7.0
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BLAKE2b-256 checksum How to use checksums |
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twine/7.0.0 CPython/3.13.14
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Transparency logRelease files / fastotel-0.7.0-cp311-abi3-macosx_10_12_x86_64.whl
| Download URL | fastotel-0.7.0-cp311-abi3-macosx_10_12_x86_64.whl |
|---|---|
| Size | 1.4 MB |
| Tags | CPython 3.11 abi3 macOS 10.12+ x86-64 |
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SHA-256 checksum How to use checksums |
1aa2ee6e8dac4f11bb707b0edbc261d5761e61b70b5b498115908de1d40be828
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BLAKE2b-256 checksum How to use checksums |
9cd20aae88f1748db02aebfbc211e8924db02fd41f110ddf31c8746851a9e7fb
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| Upload date | |
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Uploaded using Trusted Publishing? What is trusted publishing? |
Yes |
| Uploaded via |
twine/7.0.0 CPython/3.13.14
|
Provenance
Provenance describes where a file came from. On PyPI, provenance is shared via attestations, which provide a verifiable record of the build or publishing details. View details, limitations and caveats.
PyPI Publish Attestation
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