Gizzmo is a command-line client for managing gizzard clusters.
Installation and setup
Installation is a simple gem install. You may find it useful to create a ~/.gizzmorc file, which is simply YAML key/values. The keys are the long-style command line option keys converted into Ruby-style variables. A common .gizzmorc will simply be:
host: localhost port: 7920
Run `gizzmo help` for up-to-date usage.
Block and unblock a shard
BLOCKER=`gizzmo wrap com.twitter.gizzard.shards.BlockedShard a_shard` gizzmo unwrap $BLOCKER
Reweight a shard safely (the hard way)
NEW_WEIGHT=1 REPL=`gizzmo wrap com.twitter.service.flock.edges.ReplicatingShard a_shard` PARENT=`gizzmo links $REPL | cut -f 1 | grep -v $REPL | head -1` gizzmo addlink $PARENT a_shard $NEW_WEIGHT gizzmo unwrap $REPL
Contributions are welcome! Please send a pull request, or if you're internal to Twitter, please make a branch! Commits to master, and/or patches without minimal test coverage will be rejected/reverted.
The tests may be somewhat difficult to run outside of Twitter. They assume that:
You don't mind blowing away the data in your dev environment.
Your MySQL username and password are in the environment variables DB_USERNAME and DB_PASSWORD
To execute the tests:
Build the included test server (once):
// create the database for the local nameserver echo "create database gizzard_test_integration_ns;" | mysql // retrieve test server dependencies cd test_server ; sbt update
Start the test server (with service, injector, management ports of 7918, 7919, 7920 respectively):
cd test_server ; sbt "run 7918 7919 7920"
Copyright © 2010 Twitter, Inc. See LICENSE for details.