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Using the Driver : Limitations on Cloudera Impala Functionality
  

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Limitations on Cloudera Impala Functionality

Please note the following Cloudera Impala functional limitations:
*No support for transactions
*No support for canceling a running query
*No support for row-level updates or deletes
*No support for stored procedures
*No support for auto-generated keys
For a more complete listing of known issues and limitations for your version of Cloudera Impala, refer to the Cloudera Impala user documentation:
http://www.cloudera.com/content/support/en/documentation.html
Note: Cloudera Impala is not designed for OLTP workloads and does not offer row-level updates or deletes. Instead, Impala is designed for batch type jobs over large data sets with high latency. This means that queries such as "SELECT * FROM mytable" return quickly. However, other SELECT statements are much slower.