Database Reference
In-Depth Information
Real-time query with Impala on Hadoop
Impala is marketed as a product that can do real-time queries on Hadoop by its de-
veloper, Cloudera. Impala is an open source implementation based on the previously
mentioned Google Dremel technology that is available free for anyone to use. Im-
pala is available as a package product that is free to use or can be compiled from its
source, which can run queries in memory to make them real time. In some cases, de-
pending on the type of data, if the Parquet file format is used as the input data source,
it can expedite the query processing to a multifold speed.
Real-time query subscriptions with Impala
Cloudera provides a
Real-time Query
(
RTQ
) subscription as an add-on to a Cloudera
Enterprise subscription. You can still use Impala as a free, open source product;
however, opting for the RTQ subscription allows you to take advantage of the
Cloudera paid service to extend its usability and resilience. By accepting the RTQ
subscription, you can not only have access to Cloudera Technical support, but you
can also work with the Impala development team to provide ample feedback to shape
up the product design and implementation.
