1. Impala :
Impala is a query engine that runs on Hadoop. It is an open source software and massively parallel processing SQL query engine. It supports in-memory data processing. It is pioneering the use of the Parquet file format, a columnar storage layout that is optimized for large-scale queries typical in data warehouse scenarios. It provides high-performance, low-latency SQL queries and also offers interactive query processing on data stored in Hadoop file formats.
2. Mongodb :
Difference between Impala and MongoDB :
|1.||It is developed by Cloudera in 2013.||It is developed by MongoDB Inc. in 2009.|
|2.||It is an open source software.||It is also an open source software.|
|3.||Server operating systems for Impala is Linux.||Server operating systems for MongoDB are Solaris, Linux, OS X, Windows.|
|4.||It do not support In-memory capabilities.||It support In-memory capabilities.|
|5.||No transaction concepts.||ACID properties of transaction is used.|
|6.||The replication method that Impala supports is Selectable Replication Factor.||The replication method that MongoDB supports is Master Slave Replication|
|8.||It support Sharding partitioning methods for storing different data on different nodes.||It support Sharding Partitioning methods.|
|9.||JDBC and ODBC are used as APIs and access methods.||Proprietary protocol using JSON are used as APIs and other access methods.|
|10.||The Primary database model is Relational DBMS.||The Primary database model is Document store.|
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