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Learning PySpark

You're reading from   Learning PySpark Build data-intensive applications locally and deploy at scale using the combined powers of Python and Spark 2.0

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Product type Paperback
Published in Feb 2017
Publisher Packt
ISBN-13 9781786463708
Length 274 pages
Edition 1st Edition
Languages
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Authors (2):
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Denny Lee Denny Lee
Author Profile Icon Denny Lee
Denny Lee
Tomasz Drabas Tomasz Drabas
Author Profile Icon Tomasz Drabas
Tomasz Drabas
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Toc

Table of Contents (13) Chapters Close

Preface 1. Understanding Spark FREE CHAPTER 2. Resilient Distributed Datasets 3. DataFrames 4. Prepare Data for Modeling 5. Introducing MLlib 6. Introducing the ML Package 7. GraphFrames 8. TensorFrames 9. Polyglot Persistence with Blaze 10. Structured Streaming 11. Packaging Spark Applications Index

Catalyst Optimizer refresh

As noted in Chapter 1, Understanding Spark, one of the primary reasons the Spark SQL engine is so fast is because of the Catalyst Optimizer. For readers with a database background, this diagram looks similar to the logical/physical planner and cost model/cost-based optimization of a relational database management system (RDBMS):

Catalyst Optimizer refresh

The significance of this is that, as opposed to immediately processing the query, the Spark engine's Catalyst Optimizer compiles and optimizes a logical plan and has a cost optimizer that determines the most efficient physical plan generated.

Note

As noted in earlier chapters, while the Spark SQL Engine has both rules-based and cost-based optimizations that include (but are not limited to) predicate push down and column pruning. Targeted for the Apache Spark 2.2 release, the jira item [SPARK-16026] Cost-based Optimizer Framework at https://issues.apache.org/jira/browse/SPARK-16026 is an umbrella ticket to implement a cost-based optimizer...

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