How to add JAR files to a Spark job using spark-submit?

How to Add JAR Files to a Spark Job Using spark-submit

Background:

Spark-submit is a command-line tool used to submit Spark applications. It allows users to specify various options, including adding JAR files to the application's classpath.

Class Path and JAR Distribution:

• ClassPath: JAR files added via spark-submit options (--driver-class-path, --conf spark.driver.extraClassPath, --conf spark.executor.extraClassPath) modify the classpath of the driver or executor nodes.
• JAR Distribution: JAR files added via --jars or SparkContext.addJar methods are automatically distributed to worker nodes.

Option Analysis:

1. --jars vs SparkContext.addJar

• Both of these options perform the same function of adding JAR files to the application's classpath. However, they are used in different contexts:

  • --jars: Used during spark-submit command line.
  • SparkContext.addJar: Used programmatically within the Spark application.

2. SparkContext.addJar vs SparkContext.addFile

• SparkContext.addJar: Adds a JAR file that contains dependencies used by the application code.
• SparkContext.addFile: Adds an arbitrary file that may not be directly used by the application code (e.g., configuration files, data files).

3. --driver-class-path vs --conf spark.driver.extraClassPath

• Aliases that specify additional JAR files on the driver node's classpath.

4. --driver-library-path vs --conf spark.driver.extraLibraryPath

• Aliases that specify paths to additional libraries on the driver node.

5. --conf spark.executor.extraClassPath

• Specifies additional JAR files on the executor nodes' classpath.

6. --conf spark.executor.extraLibraryPath

• Specifies paths to additional libraries on the executor nodes.

Using Multiple Options Simultaneously:

As long as they are not conflicting, it is safe to use multiple JAR file addition options at the same time. However, note that JAR files should only be included in the extraClassPath options if they need to be on the classpath.

Example:

The following command demonstrates adding JAR files using various options:

spark-submit --jars additional1.jar,additional2.jar \
  --driver-class-path additional1.jar:additional2.jar \
  --conf spark.executor.extraClassPath=additional1.jar:additional2.jar \
  --class MyClass main-application.jar

Additional Considerations:

• JAR files added using --jars or SparkContext.addJar are copied to the working directory of each executor node.
• The location of the working directory is typically /var/run/spark/work.
• Avoid duplicating JAR references in different options to prevent unnecessary resource consumption.

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