Hive Query - Execution Life Cycle

#1

Let us understand the execution life cycle of a query.

  • Here is the query
SELECT order_item_order_id, sum(order_item_subtotal) AS order_revenue
FROM order_items
GROUP BY order_item_subtotal
LIMIT 10;

Once the query is submitted, this is what happens.

  • Syntax and Semantecs Check
  • Compile Hive query into Map Reduce application
  • Submit Map Reduce Application as one or more Job
  • Execute all the associated Map Reduce Jobs

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