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From "Matei Zaharia (JIRA)" <>
Subject [jira] [Created] (SPARK-9850) Adaptive execution in Spark
Date Tue, 11 Aug 2015 23:39:47 GMT
Matei Zaharia created SPARK-9850:

             Summary: Adaptive execution in Spark
                 Key: SPARK-9850
             Project: Spark
          Issue Type: New Feature
          Components: Spark Core, SQL
            Reporter: Matei Zaharia

Query planning is one of the main factors in high performance, but the current Spark engine
requires the execution DAG for a job to be set in advance. Even with cost­-based optimization,
it is hard to know the behavior of data and user-defined functions well enough to always get
great execution plans. This JIRA proposes to add adaptive query execution, so that the engine
can change the plan for each query as it sees what data earlier stages produced.

We propose adding this to Spark SQL / DataFrames first, using a new API in the Spark engine
that lets libraries run DAGs adaptively. In future JIRAs, the functionality could be extended
to other libraries or the RDD API, but that is more difficult than adding it in SQL.

I've attached a design doc by Yin Huai and myself explaining how it would work in more detail.

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