This is a pre-production deployment of Warehouse. Changes made here affect the production instance of PyPI (pypi.python.org).
Help us improve Python packaging - Donate today!

Pure Python client for Apache Kafka

Project Description

Python client for the Apache Kafka distributed stream processing system. kafka-python is designed to function much like the official java client, with a sprinkling of pythonic interfaces (e.g., consumer iterators).

kafka-python is best used with newer brokers (0.10 or 0.9), but is backwards-compatible with older versions (to 0.8.0). Some features will only be enabled on newer brokers, however; for example, fully coordinated consumer groups – i.e., dynamic partition assignment to multiple consumers in the same group – requires use of 0.9+ kafka brokers. Supporting this feature for earlier broker releases would require writing and maintaining custom leadership election and membership / health check code (perhaps using zookeeper or consul). For older brokers, you can achieve something similar by manually assigning different partitions to each consumer instance with config management tools like chef, ansible, etc. This approach will work fine, though it does not support rebalancing on failures. See <http://kafka-python.readthedocs.org/en/master/compatibility.html> for more details.

Please note that the master branch may contain unreleased features. For release documentation, please see readthedocs and/or python’s inline help.

>>> pip install kafka

KafkaConsumer

KafkaConsumer is a high-level message consumer, intended to operate as similarly as possible to the official java client. Full support for coordinated consumer groups requires use of kafka brokers that support the Group APIs: kafka v0.9+.

See <http://kafka-python.readthedocs.org/en/master/apidoc/KafkaConsumer.html> for API and configuration details.

The consumer iterator returns ConsumerRecords, which are simple namedtuples that expose basic message attributes: topic, partition, offset, key, and value:

>>> from kafka import KafkaConsumer
>>> consumer = KafkaConsumer('my_favorite_topic')
>>> for msg in consumer:
...     print (msg)
>>> # join a consumer group for dynamic partition assignment and offset commits
>>> from kafka import KafkaConsumer
>>> consumer = KafkaConsumer('my_favorite_topic', group_id='my_favorite_group')
>>> for msg in consumer:
...     print (msg)
>>> # manually assign the partition list for the consumer
>>> from kafka import TopicPartition
>>> consumer = KafkaConsumer(bootstrap_servers='localhost:1234')
>>> consumer.assign([TopicPartition('foobar', 2)])
>>> msg = next(consumer)
>>> # Deserialize msgpack-encoded values
>>> consumer = KafkaConsumer(value_deserializer=msgpack.loads)
>>> consumer.subscribe(['msgpackfoo'])
>>> for msg in consumer:
...     assert isinstance(msg.value, dict)

KafkaProducer

KafkaProducer is a high-level, asynchronous message producer. The class is intended to operate as similarly as possible to the official java client. See <http://kafka-python.readthedocs.org/en/master/apidoc/KafkaProducer.html> for more details.

>>> from kafka import KafkaProducer
>>> producer = KafkaProducer(bootstrap_servers='localhost:1234')
>>> for _ in range(100):
...     producer.send('foobar', b'some_message_bytes')
>>> # Block until a single message is sent (or timeout)
>>> future = producer.send('foobar', b'another_message')
>>> result = future.get(timeout=60)
>>> # Block until all pending messages are at least put on the network
>>> # NOTE: This does not guarantee delivery or success! It is really
>>> # only useful if you configure internal batching using linger_ms
>>> producer.flush()
>>> # Use a key for hashed-partitioning
>>> producer.send('foobar', key=b'foo', value=b'bar')
>>> # Serialize json messages
>>> import json
>>> producer = KafkaProducer(value_serializer=lambda v: json.dumps(v).encode('utf-8'))
>>> producer.send('fizzbuzz', {'foo': 'bar'})
>>> # Serialize string keys
>>> producer = KafkaProducer(key_serializer=str.encode)
>>> producer.send('flipflap', key='ping', value=b'1234')
>>> # Compress messages
>>> producer = KafkaProducer(compression_type='gzip')
>>> for i in range(1000):
...     producer.send('foobar', b'msg %d' % i)

Compression

kafka-python supports gzip compression/decompression natively. To produce or consume lz4 compressed messages, you must install lz4tools and xxhash (modules may not work on python2.6). To enable snappy compression/decompression install python-snappy (also requires snappy library). See <http://kafka-python.readthedocs.org/en/master/install.html#optional-snappy-install> for more information.

Protocol

A secondary goal of kafka-python is to provide an easy-to-use protocol layer for interacting with kafka brokers via the python repl. This is useful for testing, probing, and general experimentation. The protocol support is leveraged to enable a KafkaClient.check_version() method that probes a kafka broker and attempts to identify which version it is running (0.8.0 to 0.10).

Low-level

Legacy support is maintained for low-level consumer and producer classes, SimpleConsumer and SimpleProducer. See <http://kafka-python.readthedocs.io/en/master/simple.html?highlight=SimpleProducer> for API details.

Release History

Release History

This version
History Node

1.3.3

History Node

1.3.2

History Node

1.3.1

History Node

1.3.0

History Node

1.2.5

History Node

1.2.4

History Node

1.2.3

History Node

1.2.2

History Node

1.2.1

History Node

1.2.0

History Node

1.1.1

History Node

1.1.0

History Node

1.0.2

History Node

1.0.1

History Node

1.0.0

Download Files

Download Files

Download the file for your platform. If you're not sure which to choose, learn more about installing packages.

File Name & Checksum SHA256 Checksum Help Version File Type Upload Date
kafka-1.3.3-py2.py3-none-any.whl (200.1 kB) Copy SHA256 Checksum SHA256 2.7 Wheel Mar 14, 2017
kafka-1.3.3.tar.gz (216.3 kB) Copy SHA256 Checksum SHA256 Source Mar 14, 2017

Supported By

WebFaction WebFaction Technical Writing Elastic Elastic Search Pingdom Pingdom Monitoring Dyn Dyn DNS Sentry Sentry Error Logging CloudAMQP CloudAMQP RabbitMQ Heroku Heroku PaaS Kabu Creative Kabu Creative UX & Design Fastly Fastly CDN DigiCert DigiCert EV Certificate Rackspace Rackspace Cloud Servers DreamHost DreamHost Log Hosting