"Cloudera Impala: Real-Time Queries in Apache Hadoop, For Real" http://blog.cloudera.com/blog/2012/10/cloudera-impala-real-t...

Impala source code: https://github.com/cloudera/impala

Impala documentation can be found here: https://ccp.cloudera.com/display/IMPALA10BETADOC/Cloudera+Im...