Answer:
Impala is a SQL query system for Hadoop from Cloudera. The Cloudera positions Impala as a "real-time" query engine for Hadoop and by "real-time" they imply that
rather than running batch oriented jobs like with MapReduce, we can get much faster query results for a certain types of queries using Impala over an SQL based front-end.
It does not rely on the MapReduce infrastructure of Hadoop, instead Impala implements a completely separate engine for processing queries. So this engine is a specialized distributed query engine that is similar to what you can find in some of the commercial pattern related databases. So in essence it bypasses MapReduce.
rather than running batch oriented jobs like with MapReduce, we can get much faster query results for a certain types of queries using Impala over an SQL based front-end.
It does not rely on the MapReduce infrastructure of Hadoop, instead Impala implements a completely separate engine for processing queries. So this engine is a specialized distributed query engine that is similar to what you can find in some of the commercial pattern related databases. So in essence it bypasses MapReduce.
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