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Running Your First Apache Spark App [Code Snippets]

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Running Your First Apache Spark App [Code Snippets]

Take a look at a quick tip for getting your Apache Spark application up and running — especially if you make this common mistake.

· Big Data Zone ·
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Hortonworks Sandbox for HDP and HDF is your chance to get started on learning, developing, testing and trying out new features. Each download comes preconfigured with interactive tutorials, sample data and developments from the Apache community.

The Spark Getting Started Guide is pretty good, but it’s not immediately obvious that you don’t run your app using Spark API as a standalone executable app. If you try, you’ll get an error like this:

17/11/07 19:15:20 ERROR SparkContext: Error initializing SparkContext.
org.apache.spark.SparkException: A master URL must be set in your configuration
at org.apache.spark.SparkContext.<init>(SparkContext.scala:376)
at org.apache.spark.SparkContext$.getOrCreate(SparkContext.scala:2509)
at org.apache.spark.sql.SparkSession$Builder$$anonfun$6.apply(SparkSession.scala:909)
at org.apache.spark.sql.SparkSession$Builder$$anonfun$6.apply(SparkSession.scala:901)
at scala.Option.getOrElse(Option.scala:121)
at org.apache.spark.sql.SparkSession$Builder.getOrCreate(SparkSession.scala:901)
at kh.textanalysis.spark.SparkWordCount.workCount(SparkWordCount.java:16)
at kh.textanalysis.spark.SparkWordCount.main(SparkWordCount.java:10)

Instead, if using Maven, package the app with mvn package and start a local master node:

./sbin/start-master.sh

Then, you submit it to your Spark node for processing:

./sbin/spark-submit \
  --class "MyApp" \
  --master local[1] \
  target/MyApp-1.0.jar

And that's it! 

Hortonworks Sandbox for HDP and HDF is your chance to get started on learning, developing, testing and trying out new features. Each download comes preconfigured with interactive tutorials, sample data and developments from the Apache community.

Topics:
big data ,apache spark ,spark application ,maven ,spark api

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