mcrouter-hub: An HTTP companion to Facebook’s mcrouter
Gophercon 2015 is right around the corner and that sets up the mood for another open source project.
So, what is mcrouter? Mcrouter is a memcache router that helps Facebook scale their Memcache infrastructure to 5 billion requests per second.
It has a dozen or so, read and write strategies for customized scaling experience: Replication, hot-cold warmup, shard by prefix to a separate backend pool, and live reload config file.
The mcrouter daemon itself is tiny, on cold boot consumes 11MB of RAM, high performance C++ project.
For more information, visit mcrouter wiki page.
Live reload config file
This one particular feature is ripe to have a complementary HTTP agent helper.
Imagine the ability to live update hundreds of mcrouter, how cool is that?
So today I am please to release mcrouter-hub, an HTTP companion to mcrouter. It allows you:
In agent mode:
to expose the mcrouter config JSON via HTTP or HTTPS.
to modify the mcrouter config JSON. The POST method can be protected behind token-based security.
to expose mcrouter stats gathered from both telnet interface and file.
to export stats data to New Relic Insights.
In central mode:
to receive config JSON from all agents via HTTP or HTTPS.
to receive stats JSON from all agents.
Both features can be protected behind token-based security as well.
For more information, visit mcrouter-hub README page.
Download the binary from this list and run it.
# Agent mode # Prerequisites: # * It must be run on the same box where mcrouter is running. # * netcat command line tool must be installed. # # MCRHUB_CENTRAL_URLS is only useful if you want to have central daemons. # That setting is optional. MCROUTER_ADDR=localhost:5000 \ MCROUTER_CONFIG_FILE=/path/to/mcrouter.json \ MCRHUB_CENTRAL_URLS=http://localhost:5002 \ /path/to/mcrouter-hub # Central mode MCRHUB_MODE=central /path/to/mcrouter-hub
For those of you who run considerable Memcache infrastructure, I heartily recommend mcrouter. It provides greater flexibility when provisioning extra capacity to your cluster.
And when you do try mcrouter, feel free to try mcrouter-hub as well. See if you like it.