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You're reading from  Fast Data Processing with Spark 2 - Third Edition

Product typeBook
Published inOct 2016
Reading LevelBeginner
PublisherPackt
ISBN-139781785889271
Edition3rd Edition
Languages
Scala
Tools
Apache Spark
Concepts
Data Processing
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Author (1)
Holden Karau
Holden Karau
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Holden Karau

Holden Karau is a software development engineer and is active in the open source. She has worked on a variety of search, classification, and distributed systems problems at IBM, Alpine, Databricks, Google, Foursquare, and Amazon. She graduated from the University of Waterloo with a bachelor's of mathematics degree in computer science. Other than software, she enjoys playing with fire and hula hoops, and welding.
Read more about Holden Karau

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SparkContext - metadata

The SparkContext object has a set of metadata that I found useful. The version number, application name, and memory available are useful pieces of information. At the start of a Spark program, I usually display/log the version number.

Value

Use

appName

This value is the application name. If you have established a convention, this field can be useful at runtime.

getConf

This value returns configuration information.

getExecutorMemoryStatus

This value retrieves memory details. It could be useful if you want to check memory details. As Spark is distributed, the values do not mean that you are out of memory.

Master

This value is the name of the master.

Version

I found this value very useful, especially while testing with different versions.

Execute the following command from the shell:

cd ~/Downloads/spark-2.0.0  ( Or to wherever you have your spark installed)
bin/spark-shell

Refer to the following screenshot:

scala> spark.version
res0: String...
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Fast Data Processing with Spark 2 - Third Edition
Published in: Oct 2016Publisher: PacktISBN-13: 9781785889271
© 2016 Packt Publishing Limited All Rights Reserved

Author (1)

author image
Holden Karau

Holden Karau is a software development engineer and is active in the open source. She has worked on a variety of search, classification, and distributed systems problems at IBM, Alpine, Databricks, Google, Foursquare, and Amazon. She graduated from the University of Waterloo with a bachelor's of mathematics degree in computer science. Other than software, she enjoys playing with fire and hula hoops, and welding.
Read more about Holden Karau

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