1. Apache Whirr
On demand clusters in the cloud
Andrei Savu / @andreisavu / asavu@apache.org
TechTuesday, Bucharest @ Adobe

2. Overview
● What is Apache Whirr?
● How can I use Whirr?
● Typical Cluster Config
● What's next?
● Using Whirr for Fault Injection Testing
● Test Cycle
● Resources

3. What is Apache Whirr?
● A set of libraries for running cloud services
● Cloud-neutral
● Common service API
● Provides smart defaults
● “The code that would become Whirr
started out in 2007 as some bash scripts
in Apache Hadoop for running Hadoop
clusters on EC2.”
http://incubator.apache.org/whirr/

4. How can I use Whirr?
● Deploy clusters on demand for processing
or for testing. Ideal if you are building
applications on top of components of the
Hadoop stack.
● Supported services: Cassandra, Hadoop,
Hbase, ZooKeeper (0.3.0)
● Cloud providers: EC2, RackspaceCloud
(using jclouds)

5. Typical Cluster Config
whirr.cluster-name=hadoop
whirr.instance-templates=1 hadoop-
namenode+hadoop-jobtracker,5 hadoop-
datanode+hadoop-tasktracker
whirr.provider=ec2
whirr.identity=AWS_ACCESS_KEY_ID
whirr.credential=AWS_SECRET
whirr.hardware-id=c1.xlarge

6. More Recipes
● Check the recipes folder in the release
● Contains recipes for all the supported
services and plenty of comments.

7. What's next?
● Support for private clouds: Eucalyptus or
OpenStack
● New services: Flume, Kafka, MongoDB
● Many improvements and bug fixes
● Integration with Hudson CI for Hadoop
and Hbase (running YCSB)

8. Using Apache Whirr for
Fault injection testing

9. Fault Injection Testing
● Discover bugs in existing systems by
simulating generally faulty hardware and
networking
● Inject on small test cluster and if it can
make progress without corruption or
unrecoverable errors it will also be free of
errors on large clusters where error occur
by natural causes.

10. Test Cycle
● Setup: use Apache Whirr to bring a
cluster up
● Inject: faults based on a scenario
● Monitor: continuously – collect data for
diagnostics on failure
● This is work in progress (M.Sc. research)

11. Resources
● http://incubator.apache.org/whirr/
● Deploy Hbase in minutes:
● philwhln.com/run-the-latest-whirr-and-deploy-hbase-in-minutes
● Deploy Cassandra in minutes:
● philwhln.com/quickly-launch-a-cassandra-cluster-on-amazon-ec2

12. Resources (2)
● http://hadoop.apache.org/
● http://hbase.apache.org/
● http://zookeeper.apache.org/

13. Thanks! Questions?
Andrei Savu – Whir Committer
asavu@apache.org