itm

Fast Avro for Python

Showing:

Popularity

Downloads/wk

0

GitHub Stars

456

Maintenance

Last Commit

7d ago

Contributors

65

Package

Dependencies

0

License

MIT

Categories

Readme

fastavro

Build Status Documentation Status codecov

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 3.6
  • Python 3.7
  • Python 3.8
  • Python 3.9
  • 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 FASTAVRO_USE_CYTHON=1 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 availabe, 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 dependecies 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.

Changes

See the ChangeLog

Contact

Project Home

Rate & Review

Great Documentation0
Easy to Use0
Performant0
Highly Customizable0
Bleeding Edge0
Responsive Maintainers0
Poor Documentation0
Hard to Use0
Slow0
Buggy0
Abandoned0
Unwelcoming Community0
100