Apache Hive vs Apache Impala

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Apache Hive
The Apache Hive data warehouse software facilitates querying and managing large datasets residing in distributed storage. Hive provides a mechanism to project structure onto this data and query the data using a SQL-like language called HiveQL. At the same time this language also allows traditional map/reduce programmers to plug in their custom mappers and reducers when it is inconvenient or inefficient to express this logic in HiveQL.
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Apache Impala
Apache Impala is a modern, open source, distributed SQL query engine for Apache Hadoop.