Viewing the query timeline
The Timeline tab shows the time taken by every stage of the query execution.
The first stage is Pre-execution and DAG construction. It is executed on the Hive engine. It constitutes the time taken to compile, parse, and build the DAG for the next phase of the query execution. In the next stage of query execution, the DAG generated in Hive is submitted to Tez engine for execution. The DAG Runtime shows the time taken by the Tez engine to execute the DAG. In the post-execution stage, the HDFS files are moved or renamed.