Spark submit files - 1. --files comma-separated files list. Comma-separated list of files that are deposited in the working directory of each and every Executor using YARN Cluster Mode if memory serves correctly. Use case is (although never used myself) is configuration info that you can read in as opposed to using args [x] approach. Share.

 
1. I have a SPARK cluster with Yarn, and I want to put my job's jar into a S3 100% compatible Object Store. If I want to submit the job, I search from google and seems that just simply as this way: spark-submit --master yarn --deploy-mode cluster <...other parameters...> s3://my_ bucket/jar_file However the S3 Object Store required user name .... Gracz 1192

spark.yarn.submit.file.replication: The default HDFS replication (usually 3) HDFS replication level for the files uploaded into HDFS for the application. These include things like the Spark jar, the app jar, and any distributed cache files/archives. 0.8.1: spark.yarn.stagingDir: Current user's home directory in the filesystem command options. You specify spark-submit options using the form --option value instead of --option=value . (Use a space instead of an equals sign.) Option. Description. class. For Java and Scala applications, the fully qualified classname of the class containing the main method of the application. For example, org.apache.spark.examples.SparkPi.Using PySpark Native Features ¶. PySpark allows to upload Python files ( .py ), zipped Python packages ( .zip ), and Egg files ( .egg ) to the executors by one of the following: Setting the configuration setting spark.submit.pyFiles. Setting --py-files option in Spark scripts. Directly calling pyspark.SparkContext.addPyFile () in applications.For the 5th process I am using a spark-submit command as this process needs to leverage spark because of the size of the data being processed. I am running into issues with JDBC and Kerberos Authnetication with the spark-submit command. The Oracle @Configuration is the same for all of these processes. It works fine and authenticates fine with a ...Dec 12, 2021 · These config files will give information to Spark about the EMR cluster like which is the master node, resource manager, and hive metastore to connect to on running spark-submit. Store the config ... Spark environment provides a command to execute the application file, be it in Scala or Java(need a Jar format), Python and R programming file. The command is, $ spark-submit --master <url> <SCRIPTNAME>.py. I'm running spark in windows 64bit architecture system with JDK 1.8 version. P.S find a screenshot of my terminal window. Code snippet2. When using spark-submit with --master yarn-cluster, the application JAR file along with any JAR file included with the --jars option will be automatically transferred to the cluster. URLs supplied after --jars must be separated by commas. That list is included in the driver and executor classpaths.Jun 29, 2015 · I want to store the Spark arguments such as input file, output file into a Java property files and pass that file into Spark Driver. I'm using spark-submit for submitting the job but couldn't find a parameter to pass the properties file. Spark on Kubernetes doesn't support submitting locally stored files with spark-submit.command options. You specify spark-submit options using the form --option value instead of --option=value . (Use a space instead of an equals sign.) Option. Description. class. For Java and Scala applications, the fully qualified classname of the class containing the main method of the application. For example, org.apache.spark.examples.SparkPi.Pass system property to spark-submit and read file from classpath or custom path. 2 adding external property file to classpath in spark. 0 ...The spark-submit compatible command in Data Flow , is the rub-submit command. If you already have a working Spark application in any cluster, you are familiar with the spark-submit syntax. For example: spark-submit --master spark://<IP-address>:port \ --deploy-mode cluster \ --conf spark.sql.crossJoin.enabled=true \ --files oci://file1.json ... 2. In my Spark job I read some additional data from resources files. Some example Resources.getResource ("/more-data") It works great locally, and when I run from spark-submit master=local [*] I only to need to add --conf=spark.driver.extraClassPath=moredata. Moving to cluster mode (Yarn) it is no longer able to find the folder.It turned out that since I'm submitting my application in client mode, then the machine I run the spark-submit command from will run the driver program and will need to access the module files. I added my module to the PYTHONPATH environment variable on the node I'm submitting my job from by adding the following line to my .bashrc file (or ...spark-submit 用户打包 Spark 应用程序并部署到 Spark 支持的集群管理气上，命令语法如下：. spark-submit [options] <python file> [app arguments] app arguments 是传递给应用程序的参数，常用的命令行参数如下所示：. –master: 设置主节点 URL 的参数。. 支持：. local： 本地机器 ...file: Driver will transfer these files to Executor through HTTP, if in cluster deploy mode, Spark will first upload these file to cluster Driver. hdfs:, http:, https:, ftp: Driver and Executors will download specified files from correspond fs. local: The file is expected to exist as a local file on each worker node. referenceAug 16, 2020 · java.io.FileNotFoundException for a file sent in Spark-submit --files. 1. How to pass arguments to spark-submit using docker. 0. Running Scala Jar with Spark-Submit. 4. I have four python files , out of four files 1 file has spark entry code defined and that file drives and calls rest other python files . for now I have provided four python files with --py-files option in spark submit command , but instead of submitting this way I want to create zip file and pack these all four python files and submit with ...Using addPyFiles() seems to not be adding desiered files to spark job nodes (new to spark so may be missing some basic usage knowledge here). Attempting to run a script using pyspark and was seeing errors that certain modules are not found for import. Spark environment provides a command to execute the application file, be it in Scala or Java(need a Jar format), Python and R programming file. The command is, $ spark-submit --master <url> <SCRIPTNAME>.py. I'm running spark in windows 64bit architecture system with JDK 1.8 version. P.S find a screenshot of my terminal window. Code snippetActually When using spark-submit, the application jar along with any jars included with the --jars option will be automatically transferred to the cluster. Your extra jars could be added to --jars, they will be copied to cluster automatically. please refer to "Advanced Dependency Management" section in below link:Mar 29, 2022 · article Spark spark.sql.files.maxPartitionBytes Explained in Detail article Spark 2.x to 3.x - Date, Timestamp and Int96 Rebase Modes article Spark Schema Merge (Evolution) for Orc Files article Spark Dynamic and Static Partition Overwrite article Differences between spark.sql.shuffle.partitions and spark.default.parallelism Read more (8) For Python, you can use the --py-files argument of spark-submit to add .py, .zip or .egg ...Setting the spark-submit flags is one of the ways to dynamically supply configurations to the SparkContext object that is instantiated in the driver. spark-submit can also read configuration values set in the conf/spark-defaults.conf file which you can set using EMR configuration options when creating your cluster and, although not recommended, ...Spark environment provides a command to execute the application file, be it in Scala or Java(need a Jar format), Python and R programming file. The command is, $ spark-submit --master <url> <SCRIPTNAME>.py. I'm running spark in windows 64bit architecture system with JDK 1.8 version. P.S find a screenshot of my terminal window. Code snippetOct 21, 2016 · All the keys needs to be prefixed with spark. then use the spark-submit command like this to pass the properties file. bin/spark-submit --properties-file propertiesfile.properties. Then in the code you can get the keys using below sparkcontext getConf method. sc.getConf.get ("spark.key1") // returns value1. To do so, specify the spark properties spark.kubernetes.driver.podTemplateFile and spark.kubernetes.executor.podTemplateFile to point to local files accessible to the spark-submit process. To allow the driver pod access the executor pod template file, the file will be automatically mounted onto a volume in the driver pod when it’s created.spark-submit --master yarn --jars <comma-separated-jars> --conf <spark-properties> --name <job_name> <python_file> <argument 1> <argument 2> eg: spark-submit --master yarn --jars example.jar --conf spark.executor.instances=10 --name example_job example.py arg1 arg2 For mnistOnSpark.py you should pass arguments as mentioned in the command above ...Spark Python Application – Example. Apache Spark provides APIs for many popular programming languages. Python is on of them. One can write a python script for Apache Spark and run it using spark-submit command line interface.Dec 25, 2014 · This will let you create an .egg file which is similar to java jar file. You can then specify the path of this egg file using --py-files. spark-submit --py-files path_to_egg_file path_to_spark_driver_file. Create zip files (example- abc.zip) containing all your dependencies. I have four python files , out of four files 1 file has spark entry code defined and that file drives and calls rest other python files . for now I have provided four python files with --py-files option in spark submit command , but instead of submitting this way I want to create zip file and pack these all four python files and submit with ...Jul 26, 2021 · In Short : · Using spark-submit, the user submits an application. · In spark-submit, we invoke the main () method that the user specifies. It also launches the driver program. · The driver ... Pass system property to spark-submit and read file from classpath or custom path. 2 adding external property file to classpath in spark. 0 ...Apr 21, 2017 · It turned out that since I'm submitting my application in client mode, then the machine I run the spark-submit command from will run the driver program and will need to access the module files. I added my module to the PYTHONPATH environment variable on the node I'm submitting my job from by adding the following line to my .bashrc file (or ... Usage: spark-submit --status [submission ID] --master [spark://...] Usage: spark-submit run-example [options] example-class [example args] As you can see in the first Usage spark-submit requires <app jar | python file>. The app jar argument is a Spark application's jar with the main object (SimpleApp in your case). You can build the app jar ...I am trying to submit a spark job using 'gcloud dataproc jobs submit spark'. To connect to ES cluster I need to pass the truststore path. The job is successful if I copy the truststore file to all the worker nodes and give the absolute path as below:Mar 26, 2017 · The easiest way to set some config: spark.conf.set ("spark.sql.shuffle.partitions", 500). Where spark refers to a SparkSession, that way you can set configs at runtime. It's really useful when you want to change configs again and again to tune some spark parameters for specific queries. Share. I am trying to submit a spark job using 'gcloud dataproc jobs submit spark'. To connect to ES cluster I need to pass the truststore path. The job is successful if I copy the truststore file to all the worker nodes and give the absolute path as below:For Python, you can use the --py-files argument of spark-submit to add .py, .zip or .egg ...To do so, specify the spark properties spark.kubernetes.driver.podTemplateFile and spark.kubernetes.executor.podTemplateFile to point to local files accessible to the spark-submit process. To allow the driver pod access the executor pod template file, the file will be automatically mounted onto a volume in the driver pod when it’s created.For Python, you can use the --py-files argument of spark-submit to add .py, .zip or .egg files to be distributed with your application. If you depend on multiple Python files we recommend packaging them into a .zip or .egg. Launching Applications with spark-submit. Once a user application is bundled, it can be launched using the bin/spark ...Apr 4, 2017 · 2. When using spark-submit with --master yarn-cluster, the application JAR file along with any JAR file included with the --jars option will be automatically transferred to the cluster. URLs supplied after --jars must be separated by commas. That list is included in the driver and executor classpaths. Apr 15, 2020 · The spark-submit job will setup and configure Spark as per our instructions, execute the program we pass to it, then cleanly release the resources that were being used. A simply Python program passed to spark-submit might look like this: """ spark_submit_example.py An example of the kind of script we might want to run. The modules and functions ... For deploy-mode cluster. As previous answers mentioned, if you want to pass env variable to spark master, you want to use: --conf spark.yarn.appMasterEnv.FOO=bar // pass bar value to FOO variable --conf spark.yarn.appMasterEnv.FOO=$ {FOO} // passing current FOO env variable --conf spark.yarn.appMasterEnv.FOO2=bar2 // multiple variables are ...3 Answers. No, spark-submit --files option doesn't support sending folder, but you can put all your files in a zip, use that file in --files list. You can use SparkFiles.get (filename) in your spark job to load the file, explode it and use exploded files. 'filename' doesn't need to be absolute path, just filename does it.Usage: spark-submit --status [submission ID] --master [spark://...] Usage: spark-submit run-example [options] example-class [example args] As you can see in the first Usage spark-submit requires <app jar | python file>. The app jar argument is a Spark application's jar with the main object (SimpleApp in your case). You can build the app jar ...Once application is built, spark-submit command is called to submit the application to run in a Spark environment. Use --jars option. To add JARs to a Spark job, --jars option can be used to include JARs on Spark driver and executor classpaths. If multiple JAR files need to be included, use comma to separate them. The following is an example:Once application is built, spark-submit command is called to submit the application to run in a Spark environment. Use --jars option. To add JARs to a Spark job, --jars option can be used to include JARs on Spark driver and executor classpaths. If multiple JAR files need to be included, use comma to separate them. The following is an example:The spark-submit compatible command in Data Flow , is the rub-submit command. If you already have a working Spark application in any cluster, you are familiar with the spark-submit syntax. For example: spark-submit --master spark://<IP-address>:port \ --deploy-mode cluster \ --conf spark.sql.crossJoin.enabled=true \ --files oci://file1.json ...You can pass the arguments from the spark-submit command and then access them in your code in the following way, sys.argv[1] will get you the first argument, sys.argv[2] the second argument and so on.Dec 25, 2014 · This will let you create an .egg file which is similar to java jar file. You can then specify the path of this egg file using --py-files. spark-submit --py-files path_to_egg_file path_to_spark_driver_file. Create zip files (example- abc.zip) containing all your dependencies. 1 You could put the file on a network mount that is accessible by all the nodes on the cluster. This way you can just read from that mount in your driver program. You could expose a simple endpoint that returns the file. This way your driver program can make an http call. – Alex Naspo Jan 20, 2016 at 20:39 True enough, @AlexNaspo, but redundant. Spark submit command ( spark-submit ) can be used to run your Spark applications in a target environment (standalone, YARN, Kubernetes, Mesos).&nbsp; There are three commonly used arguments: --num-executors&nbsp; --executor-cores&nbsp; --executor-memory . This argument only works on YARN and ...But when I copy the same to my properties file: spark.class MyClass spark.master spark://my_master spark.files test.config spark.jars build/jars/MyProject.jar, build/jars/Config.jar On trying to use this file with spark-submit, I get an error: java.lang.IllegalArgumentException: Missing application resourceSpark Python Application – Example. Apache Spark provides APIs for many popular programming languages. Python is on of them. One can write a python script for Apache Spark and run it using spark-submit command line interface.Apr 4, 2017 · 2. When using spark-submit with --master yarn-cluster, the application JAR file along with any JAR file included with the --jars option will be automatically transferred to the cluster. URLs supplied after --jars must be separated by commas. That list is included in the driver and executor classpaths. With the --files option you put the file in your working directory on the executor. You are trying to point to the file using an absolute path which is not what files option does for you. Can you use just the name "rule2.xml" and not a path. When you read the documentation for the files. See the important note at the bottom of the page running ...Dec 18, 2020 · With Spark 3.4, spark.files, spark.jars, and spark.pyfiles all are placed in the current working directory of Driver & Executor while using K8s resource manager. With 3.5 all these will be available on classpath as well. I want to store the Spark arguments such as input file, output file into a Java property files and pass that file into Spark Driver. I'm using spark-submit for submitting the job but couldn't find a parameter to pass the properties file.Jul 26, 2021 · In Short : · Using spark-submit, the user submits an application. · In spark-submit, we invoke the main () method that the user specifies. It also launches the driver program. · The driver ... Oct 16, 2017 · Spark-submit can't locate local file. Ask Question Asked 5 years, 10 months ago. Modified 5 years, 10 months ago. Viewed 8k times 2 I've written a very simple python ... The spark-submit command is a utility to run or submit a Spark or PySpark application program (or job) to the cluster by specifying options and configurations, the application you are submitting can be written in Scala, Java, or Python (PySpark). spark-submit command supports the following.Using PySpark Native Features ¶. PySpark allows to upload Python files ( .py ), zipped Python packages ( .zip ), and Egg files ( .egg ) to the executors by one of the following: Setting the configuration setting spark.submit.pyFiles. Setting --py-files option in Spark scripts. Directly calling pyspark.SparkContext.addPyFile () in applications.We are using Spark 2.3.0 on Yarn in pseudo distributed mode. We need to query a postgres table from spark whose configurations are defined in a properties file. I passed the property file using --files attribute of spark submit. To read the file in my code I simply used java.util.Properties.PropertiesReader class. 1. --files comma-separated files list. Comma-separated list of files that are deposited in the working directory of each and every Executor using YARN Cluster Mode if memory serves correctly. Use case is (although never used myself) is configuration info that you can read in as opposed to using args [x] approach. Share.The Spark shell and spark-submit tool support two ways to load configurations dynamically. The first are command line options, such as --master, as shown above. spark-submit can accept any Spark property using the --conf flag, but uses special flags for properties that play a part in launching the Spark application.Using addPyFiles() seems to not be adding desiered files to spark job nodes (new to spark so may be missing some basic usage knowledge here). Attempting to run a script using pyspark and was seeing errors that certain modules are not found for import.I forgot to look inside spark-submit --help. And this is what it says: --files FILES Comma-separated list of files to be placed in the working directory of each executor. File paths of these files in executors can be accessed via SparkFiles.get (fileName). Sometimes it's right under ones own nose..For Python, you can use the --py-files argument of spark-submit to add .py, .zip or .egg files to be distributed with your application. If you depend on multiple Python files we recommend packaging them into a .zip or .egg. Launching Applications with spark-submit. Once a user application is bundled, it can be launched using the bin/spark ...Jul 24, 2022 · Note that files passed through --files and --archives are available for Spark executors only. This behavior is consistent with spark-submit. If you need the files to be accessible by Spark driver, consider using an init action to put the files somewhere in the local filesystem explictly. Using addPyFiles() seems to not be adding desiered files to spark job nodes (new to spark so may be missing some basic usage knowledge here). Attempting to run a script using pyspark and was seeing errors that certain modules are not found for import. Feb 12, 2020 · Imagine how to configure the network communication between your machine and Spark Pods in Kubernetes: in order to pull your local jars Spark Pod should be able to access you machine (probably you need to run web-server locally and expose its endpoints), and vice-versa in order to push jar from you machine to the Spark Pod your spark-submit ... Aug 16, 2020 · java.io.FileNotFoundException for a file sent in Spark-submit --files. 1. How to pass arguments to spark-submit using docker. 0. Running Scala Jar with Spark-Submit. 4. I have four python files , out of four files 1 file has spark entry code defined and that file drives and calls rest other python files . for now I have provided four python files with --py-files option in spark submit command , but instead of submitting this way I want to create zip file and pack these all four python files and submit with ...1 Answer. One way is to have a main driver program for your Spark application as a python file (.py) that gets passed to spark-submit. This primary script has the main method to help the Driver identify the entry point. This file will customize configuration properties as well initialize the SparkContext. The ones bundled in the egg executables ...Mar 23, 2017 · I am currently running spark 2.1.0. I have worked most of the time in PYSPARK shell, but I need to spark-submit a python file(similar to spark-submit jar in java) . The Spark shell and spark-submit tool support two ways to load configurations dynamically. The first is command line options, such as --master, as shown above. spark-submit can accept any Spark property using the --conf/-c flag, but uses special flags for properties that play a part in launching the Spark application. This will let you create an .egg file which is similar to java jar file. You can then specify the path of this egg file using --py-files. spark-submit --py-files path_to_egg_file path_to_spark_driver_file. Create zip files (example- abc.zip) containing all your dependencies.--py-files PY_FILES Comma-separated list of .zip, .egg, or .py files to place on the PYTHONPATH for Python apps. So your command will look as follow spark-submit --master local --driver-memory 2g --executor-memory 2g --py-files s3_path\file2.py,s3_path\file3.py,s3_path\file4.py s3_path\file1.pycommand options. You specify spark-submit options using the form --option value instead of --option=value . (Use a space instead of an equals sign.) Option. Description. class. For Java and Scala applications, the fully qualified classname of the class containing the main method of the application. For example, org.apache.spark.examples.SparkPi. But when I copy the same to my properties file: spark.class MyClass spark.master spark://my_master spark.files test.config spark.jars build/jars/MyProject.jar, build/jars/Config.jar On trying to use this file with spark-submit, I get an error: java.lang.IllegalArgumentException: Missing application resource21. First you need to pass your files through --py-files or --files. When you pass your zip/files with the above flags, basically your resources will be transferred to temporary directory created on HDFS just for the lifetime of that application. Now in your code, add those zip/files by using the following command.

Apr 4, 2017 · 2. When using spark-submit with --master yarn-cluster, the application JAR file along with any JAR file included with the --jars option will be automatically transferred to the cluster. URLs supplied after --jars must be separated by commas. That list is included in the driver and executor classpaths. . Why did y

spark submit files

The most basic steps to configure the key stores and the trust store for a Spark Standalone deployment mode is as follows: Generate a key pair for each node. Export the public key of the key pair to a file on each node. Import all exported public keys into a single trust store.rdd = sc.textFile ("file:///path/to/file") If your file isn’t already on all nodes in the cluster, you can load it locally on the driver without going through Spark and then call parallelize to distribute the contents to workers. Take care to put file:// in front and the use of "/" or "\" according to OS. Share.It turned out that since I'm submitting my application in client mode, then the machine I run the spark-submit command from will run the driver program and will need to access the module files. I added my module to the PYTHONPATH environment variable on the node I'm submitting my job from by adding the following line to my .bashrc file (or ...2. In my Spark job I read some additional data from resources files. Some example Resources.getResource ("/more-data") It works great locally, and when I run from spark-submit master=local [*] I only to need to add --conf=spark.driver.extraClassPath=moredata. Moving to cluster mode (Yarn) it is no longer able to find the folder.command options. You specify spark-submit options using the form --option value instead of --option=value . (Use a space instead of an equals sign.) Option. Description. class. For Java and Scala applications, the fully qualified classname of the class containing the main method of the application. For example, org.apache.spark.examples.SparkPi.I am trying to submit a spark job using 'gcloud dataproc jobs submit spark'. To connect to ES cluster I need to pass the truststore path. The job is successful if I copy the truststore file to all the worker nodes and give the absolute path as below:The spark-submit compatible command in Data Flow , is the rub-submit command. If you already have a working Spark application in any cluster, you are familiar with the spark-submit syntax. For example: spark-submit --master spark://<IP-address>:port \ --deploy-mode cluster \ --conf spark.sql.crossJoin.enabled=true \ --files oci://file1.json ...To do so, specify the spark properties spark.kubernetes.driver.podTemplateFile and spark.kubernetes.executor.podTemplateFile to point to local files accessible to the spark-submit process. To allow the driver pod access the executor pod template file, the file will be automatically mounted onto a volume in the driver pod when it’s created.To do so, specify the spark properties spark.kubernetes.driver.podTemplateFile and spark.kubernetes.executor.podTemplateFile to point to local files accessible to the spark-submit process. To allow the driver pod access the executor pod template file, the file will be automatically mounted onto a volume in the driver pod when it’s created. Jul 21, 2020 · For the 5th process I am using a spark-submit command as this process needs to leverage spark because of the size of the data being processed. I am running into issues with JDBC and Kerberos Authnetication with the spark-submit command. The Oracle @Configuration is the same for all of these processes. It works fine and authenticates fine with a ... 21. First you need to pass your files through --py-files or --files. When you pass your zip/files with the above flags, basically your resources will be transferred to temporary directory created on HDFS just for the lifetime of that application. Now in your code, add those zip/files by using the following command.Oct 23, 2020 · Yeah I added another parameter. It was Spark-submit --py-files wheelfile driver.py This driver was calling the function inside wheelfile. But then this driver and wheel are in same location essentially. What is the use of wheel then? Because if I run the command with spark-submit driver.py . Then also its the same Right?? – I am trying to submit a spark job using 'gcloud dataproc jobs submit spark'. To connect to ES cluster I need to pass the truststore path. The job is successful if I copy the truststore file to all the worker nodes and give the absolute path as below:For the 5th process I am using a spark-submit command as this process needs to leverage spark because of the size of the data being processed. I am running into issues with JDBC and Kerberos Authnetication with the spark-submit command. The Oracle @Configuration is the same for all of these processes. It works fine and authenticates fine with a ...Mar 23, 2017 · I am currently running spark 2.1.0. I have worked most of the time in PYSPARK shell, but I need to spark-submit a python file(similar to spark-submit jar in java) . This mode is preferred for Production Run of a Spark Applications or Jobs. Client mode - In client mode, the driver run will run in the local machine (your laptop\desktop terminal). This mode is used for Testing , Debugging or To Test Issue Fixes of a Spark Application or job. However although the the driver runs locally but all the executors ... 1. I am using spark 2.4.1 version and java8. I am trying to load external property file while submitting my spark job using spark-submit. As I am using below TypeSafe to load my property file. <groupId>com.typesafe</groupId> <artifactId>config</artifactId> <version>1.3.1</version>. In my code I am using.So, I am trying to redirect the output of an apache spark-submit command to text file but some output fails to populate file. Here is the command I am using: spark-submit something.py > results.txt I can see the output in the terminal but I do not see it in the file. What am I forgetting or doing wrong here? Edit: If I useI am trying to submit a spark job using 'gcloud dataproc jobs submit spark'. To connect to ES cluster I need to pass the truststore path. The job is successful if I copy the truststore file to all the worker nodes and give the absolute path as below:The most basic steps to configure the key stores and the trust store for a Spark Standalone deployment mode is as follows: Generate a key pair for each node. Export the public key of the key pair to a file on each node. Import all exported public keys into a single trust store. command options. You specify spark-submit options using the form --option value instead of --option=value . (Use a space instead of an equals sign.) Option. Description. class. For Java and Scala applications, the fully qualified classname of the class containing the main method of the application. For example, org.apache.spark.examples.SparkPi. .

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