Learning Cloudera Impala

 Cloudera Impala — надстройка над Hadoop или HBase для написания и выполнения SQL запросов, которые будут трансформированы в MapReduce Job.

Цитируем:

«Previously we discussed the Impala daemon, statestore, and metastore in detail to understand how they work together. Essentially, Impala daemons receive queries from a variety of sources and distribute the query load to Impala daemons running on other nodes. While doing so, it interacts with the statestore for node-specific updates and accesses the metastore, either stored in the centralized database or in the local cache. Now to complete the Impala execution, we will discuss how Impala interacts with other components, that is, Hive, HDFS, and HBase».