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Welcome to mcrouter

Mcrouter is a Memcache protocol routing layer that enables the easy expansion of memcached deployments to distributed pools of arbitrary side, providing request routing, connection pooling, failover, and many other features. Because the routing and feature logic are abstracted from the client in mcrouter deployments, the client may simply communicate with destination hosts through mcrouter over a TCP connection using standard Memcache protocol.

Typically, little or no client modification is needed to use mcrouter, which was designed to be a drop-in proxy between the client and memcached hosts. At Facebook and Instagram, mcrouter is a core component of a distributed cache infrastructure that spans a very large number of individual memcached boxes.

Mcrouter supports typical memcache protocol commands like get, set, delete, etc. and specific commands to access stats, version and so on. See Routing for more.

For a detailed introduction to mcrouter, see Overview.

Features

• Request routing
• Connection Pooling
• Flexible Configuration
• Failover support
• Shadow testing support

News

• mcrouter v1.0 Released (September, 2014)
• etc.

Getting Started

To install Mcrouter, see Installation.

Assuming you have a memcached instance on the local host running on port 5001, the simplest Mcrouter setup is as following (Note, "::1" is the IPv6 loopback address; IPv6 addresses must be specified in square brackets. You can also use "127.0.0.1:5001" or "localhost:5001"):

./mcrouter --config-str='{"pools":{"A":{"servers":["[::1]:5001"]}},"route":"PoolRoute|A"}' -p 5000

To test, send a request to port 5000. For example, using Netcat (http://netcat.sourceforge.net/):

echo -ne "get key\r\n" | nc 0 5000

For a complete list of command line arguments, check ./mcrouter --help.

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