fastavro

Because the Apache Python avro package is written in pure Python, it is
relatively slow. In one test case, it takes about 14 seconds to iterate through
a file of 10,000 records. By comparison, the JAVA avro SDK reads the same file in
1.9 seconds.

The fastavro library was written to offer performance comparable to the Java
library. With regular CPython, fastavro uses C extensions which allow it to
iterate the same 10,000 record file in 1.7 seconds. With PyPy, this drops to 1.5
seconds (to be fair, the JAVA benchmark is doing some extra JSON
encoding/decoding).

fastavro supports the following Python versions:

Python 3.9
Python 3.10
Python 3.11
Python 3.12
Python 3.13
PyPy3

Supported Features

File Writer
File Reader (iterating via records or blocks)
Schemaless Writer
Schemaless Reader
JSON Writer
JSON Reader
Codecs (Snappy, Deflate, Zstandard, Bzip2, LZ4, XZ)
Schema resolution
Aliases
Logical Types
Parsing schemas into the canonical form
Schema fingerprinting

Missing Features

Anything involving Avro's RPC features

Documentation

Documentation is available at http://fastavro.readthedocs.io/en/latest/

Installing

fastavro is available both on PyPI

pip install fastavro

and on conda-forge conda channel.

conda install -c conda-forge fastavro

Contributing

Bugs and new feature requests typically start as GitHub issues where they can be discussed. I try to resolve these as time affords, but PRs are welcome from all.
Get approval from discussing on the GitHub issue before opening the pull request
Tests must be passing for pull request to be considered

Developer requirements can be installed with pip install -r developer_requirements.txt.
If those are installed, you can run the tests with ./run-tests.sh. If you have trouble
installing those dependencies, you can run docker build . to run the tests inside
a Docker container. This won't test on all versions of Python or on PyPy, so it's possible
to still get CI failures after making a pull request, but we can work through those errors
if/when they happen. .run-tests.sh only covers the Cython tests. In order to test the
pure Python implementation, comment out python setup.py build_ext --inplace
and re-run.

NOTE: Some tests might fail when running the tests locally. An example of this
is this codec tests. If the supporting codec library is not available, the test
will fail. These failures can be ignored since the tests will on pull requests
and will be run in the correct environments with the correct dependencies set up.

Releasing

We release both to PyPI and to conda-forge.

We assume you have twine installed and that you've created your own
fork of fastavro-feedstock.

Make sure the tests pass
Run make tag
Wait for all artifacts to be built and published to the GitHub release.
Run make publish
The conda-forge PR should get created and merged automatically

Changes

See the ChangeLog

Contact

Project Home

Dependencies of fastavro (3).
Dependency	Optional
cramjam	true
lz4	true
zstandard	true

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fastavro

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