pymemcache 1.0.1

A comprehensive, fast, pure Python memcached client

pymemcache

A comprehensive, fast, pure-Python memcached client.

pymemcache supports the following features:

• Complete implementation of the memcached text protocol.

• Configurable timeouts for socket connect and send/recv calls.

• Access to the “noreply” flag, which can significantly increase the speed of writes.

• Flexible, simple approach to serialization and deserialization.

• The (optional) ability to treat network and memcached errors as cache misses.

Installing pymemcache

You can install pymemcache manually, with Nose tests, by doing the following:

git clone https://github.com/pinterest/pymemcache.git cd pymemcache python setup.py nosetests sudo python setup.py install

You can also use pip:

sudo pip install https://github.com/pinterest/pymemcache.git

Usage

See the module documentation in pymemcache.client for details.

Comparison with Other Libraries

pylibmc

The pylibmc library is a wrapper around libmemcached, implemented in C. It is fast, implements consistent hashing, the full memcached protocol and timeouts. It does not provide access to the “noreply” flag, and it doesn’t provide a built-in API for serialization and deserialization. It also isn’t pure Python, so using it with libraries like gevent is out of the question.

Python-memcache

The python-memcache library implements the entire memcached text protocol, has a single timeout for all socket calls and has a flexible approach to serialization and deserialization. It is also written entirely in Python, so it works well with libraries like gevent. However, it is tied to using thread locals, doesn’t implement “noreply”, can’t treat errors as cache misses and is slower than both pylibmc and pymemcache. It is also tied to a specific method for handling clusters of memcached servers.

memcache_client

The team at mixpanel put together a pure Python memcached client as well. It has more fine grained support for socket timeouts, only connects to a single host. However, it doesn’t support most of the memcached API (just get, set, delete and stats), doesn’t support “noreply”, has no serialization or deserialization support and can’t treat errors as cache misses.

External Links

The memcached text protocol reference page:

https://github.com/memcached/memcached/blob/master/doc/protocol.txt

The python-memcached library (another pure-Python library):

http://www.tummy.com/Community/software/python-memcached/

Mixpanel’s Blog post about their memcached client for Python:

http://code.mixpanel.com/2012/07/16/we-went-down-so-we-wrote-a-better-pure-python-memcache-client/

Mixpanel’s pure Python memcached client:

https://github.com/mixpanel/memcache_client

Credits

1. Dave Dash (davedash) 1. Dan Crosta (dcrosta)