commit 62c65fa963e139839b1459e6c9aaf80130ff01b7
Author: karthik <karthik@barrelsofdata.com>
Date:   Thu Jul 9 13:26:50 2020 +0000

    Initial commit

diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..625dd55
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,11 @@
+# Compiled classes
+*.class
+# Gradle files
+.gralde
+# IntelliJ IDEA files
+.idea
+# Build files
+build
+# Log files
+*.log
+logs
diff --git a/README.md b/README.md
new file mode 100644
index 0000000..c1d5848
--- /dev/null
+++ b/README.md
@@ -0,0 +1,26 @@
+# Spark Boilerplate
+This is a boilerplate project for Apache Spark. The related blog post can be found at [https://www.barrelsofdata.com/spark-boilerplate-using-scala](https://www.barrelsofdata.com/spark-boilerplate-using-scala)
+
+## Build instructions
+From the root of the project execute the below commands
+- To clear all compiled classes, build and log directories
+```shell script
+./gradlew clean
+```
+- To run tests
+```shell script
+./gradlew test
+```
+- To build jar
+```shell script
+./gradlew shadowJar
+```
+- All combined
+```shell script
+./gradlew clean test shadowJar
+```
+
+## Run
+```shell script
+spark-submit --master yarn --deploy-mode cluster build/libs/spark-boilerplate-1.0.jar
+```
\ No newline at end of file
diff --git a/build.gradle b/build.gradle
new file mode 100644
index 0000000..77a8885
--- /dev/null
+++ b/build.gradle
@@ -0,0 +1,45 @@
+plugins {
+    id "scala"
+    id "com.github.johnrengelman.shadow" version "${shadowJarPluginVersion}"
+}
+
+group "${projectGroup}"
+version "${projectVersion}"
+
+repositories {
+    mavenCentral()
+}
+
+dependencies {
+    compileOnly group: "org.scala-lang", name:"scala-library", version: "${scalaMajorVersion}.${scalaMinorVersion}"
+
+    compileOnly group: "org.apache.spark", name: "spark-core_${scalaMajorVersion}", version: "${apacheSparkVersion}"
+    compileOnly group: "org.apache.spark", name: "spark-sql_${scalaMajorVersion}", version: "${apacheSparkVersion}"
+    
+    testImplementation group: "org.scalatest", name: "scalatest_${scalaMajorVersion}", version: "${scalaTestVersion}"
+}
+
+configurations {
+    testImplementation.extendsFrom compileOnly
+}
+
+task scalaTest(dependsOn: ['testClasses'], type: JavaExec) {
+    main = 'org.scalatest.tools.Runner'
+    args = ['-R', 'build/classes/scala/test', '-o']
+    classpath = sourceSets.test.runtimeClasspath
+}
+
+test.dependsOn scalaTest
+
+shadowJar {
+    mergeServiceFiles()
+    zip64 true
+    manifest {
+        attributes "Main-Class": "${mainClass}"
+    }
+    archiveFileName.set("${getArchiveBaseName().get()}-${projectVersion}.${getArchiveExtension().get()}")
+}
+
+clean.doFirst {
+    delete "logs/"
+}
\ No newline at end of file
diff --git a/gradle.properties b/gradle.properties
new file mode 100644
index 0000000..12adfdf
--- /dev/null
+++ b/gradle.properties
@@ -0,0 +1,14 @@
+scalaMajorVersion=2.12
+scalaMinorVersion=10
+
+apacheSparkVersion=3.0.0
+
+scalaTestVersion=3.1.2
+
+shadowJarPluginVersion=6.0.0
+
+mainClass=com.barrelsofdata.sparkexamples.Driver
+projectGroup=com.barrelsofdata.sparkexamples
+projectVersion=1.0
+
+org.gradle.daemon=false
diff --git a/gradle/wrapper/gradle-wrapper.jar b/gradle/wrapper/gradle-wrapper.jar
new file mode 100644
index 0000000..62d4c05
Binary files /dev/null and b/gradle/wrapper/gradle-wrapper.jar differ
diff --git a/gradle/wrapper/gradle-wrapper.properties b/gradle/wrapper/gradle-wrapper.properties
new file mode 100644
index 0000000..bb8b2fc
--- /dev/null
+++ b/gradle/wrapper/gradle-wrapper.properties
@@ -0,0 +1,5 @@
+distributionBase=GRADLE_USER_HOME
+distributionPath=wrapper/dists
+distributionUrl=https\://services.gradle.org/distributions/gradle-6.5.1-bin.zip
+zipStoreBase=GRADLE_USER_HOME
+zipStorePath=wrapper/dists
diff --git a/gradlew b/gradlew
new file mode 100755
index 0000000..fbd7c51
--- /dev/null
+++ b/gradlew
@@ -0,0 +1,185 @@
+#!/usr/bin/env sh
+
+#
+# Copyright 2015 the original author or authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      https://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+
+##############################################################################
+##
+##  Gradle start up script for UN*X
+##
+##############################################################################
+
+# Attempt to set APP_HOME
+# Resolve links: $0 may be a link
+PRG="$0"
+# Need this for relative symlinks.
+while [ -h "$PRG" ] ; do
+    ls=`ls -ld "$PRG"`
+    link=`expr "$ls" : '.*-> \(.*\)$'`
+    if expr "$link" : '/.*' > /dev/null; then
+        PRG="$link"
+    else
+        PRG=`dirname "$PRG"`"/$link"
+    fi
+done
+SAVED="`pwd`"
+cd "`dirname \"$PRG\"`/" >/dev/null
+APP_HOME="`pwd -P`"
+cd "$SAVED" >/dev/null
+
+APP_NAME="Gradle"
+APP_BASE_NAME=`basename "$0"`
+
+# Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
+DEFAULT_JVM_OPTS='"-Xmx64m" "-Xms64m"'
+
+# Use the maximum available, or set MAX_FD != -1 to use that value.
+MAX_FD="maximum"
+
+warn () {
+    echo "$*"
+}
+
+die () {
+    echo
+    echo "$*"
+    echo
+    exit 1
+}
+
+# OS specific support (must be 'true' or 'false').
+cygwin=false
+msys=false
+darwin=false
+nonstop=false
+case "`uname`" in
+  CYGWIN* )
+    cygwin=true
+    ;;
+  Darwin* )
+    darwin=true
+    ;;
+  MINGW* )
+    msys=true
+    ;;
+  NONSTOP* )
+    nonstop=true
+    ;;
+esac
+
+CLASSPATH=$APP_HOME/gradle/wrapper/gradle-wrapper.jar
+
+
+# Determine the Java command to use to start the JVM.
+if [ -n "$JAVA_HOME" ] ; then
+    if [ -x "$JAVA_HOME/jre/sh/java" ] ; then
+        # IBM's JDK on AIX uses strange locations for the executables
+        JAVACMD="$JAVA_HOME/jre/sh/java"
+    else
+        JAVACMD="$JAVA_HOME/bin/java"
+    fi
+    if [ ! -x "$JAVACMD" ] ; then
+        die "ERROR: JAVA_HOME is set to an invalid directory: $JAVA_HOME
+
+Please set the JAVA_HOME variable in your environment to match the
+location of your Java installation."
+    fi
+else
+    JAVACMD="java"
+    which java >/dev/null 2>&1 || die "ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
+
+Please set the JAVA_HOME variable in your environment to match the
+location of your Java installation."
+fi
+
+# Increase the maximum file descriptors if we can.
+if [ "$cygwin" = "false" -a "$darwin" = "false" -a "$nonstop" = "false" ] ; then
+    MAX_FD_LIMIT=`ulimit -H -n`
+    if [ $? -eq 0 ] ; then
+        if [ "$MAX_FD" = "maximum" -o "$MAX_FD" = "max" ] ; then
+            MAX_FD="$MAX_FD_LIMIT"
+        fi
+        ulimit -n $MAX_FD
+        if [ $? -ne 0 ] ; then
+            warn "Could not set maximum file descriptor limit: $MAX_FD"
+        fi
+    else
+        warn "Could not query maximum file descriptor limit: $MAX_FD_LIMIT"
+    fi
+fi
+
+# For Darwin, add options to specify how the application appears in the dock
+if $darwin; then
+    GRADLE_OPTS="$GRADLE_OPTS \"-Xdock:name=$APP_NAME\" \"-Xdock:icon=$APP_HOME/media/gradle.icns\""
+fi
+
+# For Cygwin or MSYS, switch paths to Windows format before running java
+if [ "$cygwin" = "true" -o "$msys" = "true" ] ; then
+    APP_HOME=`cygpath --path --mixed "$APP_HOME"`
+    CLASSPATH=`cygpath --path --mixed "$CLASSPATH"`
+    
+    JAVACMD=`cygpath --unix "$JAVACMD"`
+
+    # We build the pattern for arguments to be converted via cygpath
+    ROOTDIRSRAW=`find -L / -maxdepth 1 -mindepth 1 -type d 2>/dev/null`
+    SEP=""
+    for dir in $ROOTDIRSRAW ; do
+        ROOTDIRS="$ROOTDIRS$SEP$dir"
+        SEP="|"
+    done
+    OURCYGPATTERN="(^($ROOTDIRS))"
+    # Add a user-defined pattern to the cygpath arguments
+    if [ "$GRADLE_CYGPATTERN" != "" ] ; then
+        OURCYGPATTERN="$OURCYGPATTERN|($GRADLE_CYGPATTERN)"
+    fi
+    # Now convert the arguments - kludge to limit ourselves to /bin/sh
+    i=0
+    for arg in "$@" ; do
+        CHECK=`echo "$arg"|egrep -c "$OURCYGPATTERN" -`
+        CHECK2=`echo "$arg"|egrep -c "^-"`                                 ### Determine if an option
+
+        if [ $CHECK -ne 0 ] && [ $CHECK2 -eq 0 ] ; then                    ### Added a condition
+            eval `echo args$i`=`cygpath --path --ignore --mixed "$arg"`
+        else
+            eval `echo args$i`="\"$arg\""
+        fi
+        i=`expr $i + 1`
+    done
+    case $i in
+        0) set -- ;;
+        1) set -- "$args0" ;;
+        2) set -- "$args0" "$args1" ;;
+        3) set -- "$args0" "$args1" "$args2" ;;
+        4) set -- "$args0" "$args1" "$args2" "$args3" ;;
+        5) set -- "$args0" "$args1" "$args2" "$args3" "$args4" ;;
+        6) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" ;;
+        7) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" ;;
+        8) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" "$args7" ;;
+        9) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" "$args7" "$args8" ;;
+    esac
+fi
+
+# Escape application args
+save () {
+    for i do printf %s\\n "$i" | sed "s/'/'\\\\''/g;1s/^/'/;\$s/\$/' \\\\/" ; done
+    echo " "
+}
+APP_ARGS=`save "$@"`
+
+# Collect all arguments for the java command, following the shell quoting and substitution rules
+eval set -- $DEFAULT_JVM_OPTS $JAVA_OPTS $GRADLE_OPTS "\"-Dorg.gradle.appname=$APP_BASE_NAME\"" -classpath "\"$CLASSPATH\"" org.gradle.wrapper.GradleWrapperMain "$APP_ARGS"
+
+exec "$JAVACMD" "$@"
diff --git a/gradlew.bat b/gradlew.bat
new file mode 100644
index 0000000..5093609
--- /dev/null
+++ b/gradlew.bat
@@ -0,0 +1,104 @@
+@rem
+@rem Copyright 2015 the original author or authors.
+@rem
+@rem Licensed under the Apache License, Version 2.0 (the "License");
+@rem you may not use this file except in compliance with the License.
+@rem You may obtain a copy of the License at
+@rem
+@rem      https://www.apache.org/licenses/LICENSE-2.0
+@rem
+@rem Unless required by applicable law or agreed to in writing, software
+@rem distributed under the License is distributed on an "AS IS" BASIS,
+@rem WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+@rem See the License for the specific language governing permissions and
+@rem limitations under the License.
+@rem
+
+@if "%DEBUG%" == "" @echo off
+@rem ##########################################################################
+@rem
+@rem  Gradle startup script for Windows
+@rem
+@rem ##########################################################################
+
+@rem Set local scope for the variables with windows NT shell
+if "%OS%"=="Windows_NT" setlocal
+
+set DIRNAME=%~dp0
+if "%DIRNAME%" == "" set DIRNAME=.
+set APP_BASE_NAME=%~n0
+set APP_HOME=%DIRNAME%
+
+@rem Resolve any "." and ".." in APP_HOME to make it shorter.
+for %%i in ("%APP_HOME%") do set APP_HOME=%%~fi
+
+@rem Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
+set DEFAULT_JVM_OPTS="-Xmx64m" "-Xms64m"
+
+@rem Find java.exe
+if defined JAVA_HOME goto findJavaFromJavaHome
+
+set JAVA_EXE=java.exe
+%JAVA_EXE% -version >NUL 2>&1
+if "%ERRORLEVEL%" == "0" goto init
+
+echo.
+echo ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
+echo.
+echo Please set the JAVA_HOME variable in your environment to match the
+echo location of your Java installation.
+
+goto fail
+
+:findJavaFromJavaHome
+set JAVA_HOME=%JAVA_HOME:"=%
+set JAVA_EXE=%JAVA_HOME%/bin/java.exe
+
+if exist "%JAVA_EXE%" goto init
+
+echo.
+echo ERROR: JAVA_HOME is set to an invalid directory: %JAVA_HOME%
+echo.
+echo Please set the JAVA_HOME variable in your environment to match the
+echo location of your Java installation.
+
+goto fail
+
+:init
+@rem Get command-line arguments, handling Windows variants
+
+if not "%OS%" == "Windows_NT" goto win9xME_args
+
+:win9xME_args
+@rem Slurp the command line arguments.
+set CMD_LINE_ARGS=
+set _SKIP=2
+
+:win9xME_args_slurp
+if "x%~1" == "x" goto execute
+
+set CMD_LINE_ARGS=%*
+
+:execute
+@rem Setup the command line
+
+set CLASSPATH=%APP_HOME%\gradle\wrapper\gradle-wrapper.jar
+
+
+@rem Execute Gradle
+"%JAVA_EXE%" %DEFAULT_JVM_OPTS% %JAVA_OPTS% %GRADLE_OPTS% "-Dorg.gradle.appname=%APP_BASE_NAME%" -classpath "%CLASSPATH%" org.gradle.wrapper.GradleWrapperMain %CMD_LINE_ARGS%
+
+:end
+@rem End local scope for the variables with windows NT shell
+if "%ERRORLEVEL%"=="0" goto mainEnd
+
+:fail
+rem Set variable GRADLE_EXIT_CONSOLE if you need the _script_ return code instead of
+rem the _cmd.exe /c_ return code!
+if  not "" == "%GRADLE_EXIT_CONSOLE%" exit 1
+exit /b 1
+
+:mainEnd
+if "%OS%"=="Windows_NT" endlocal
+
+:omega
diff --git a/settings.gradle b/settings.gradle
new file mode 100644
index 0000000..d63964b
--- /dev/null
+++ b/settings.gradle
@@ -0,0 +1 @@
+rootProject.name = 'spark-boilerplate'
diff --git a/src/main/scala/com/barrelsofdata/sparkexamples/Driver.scala b/src/main/scala/com/barrelsofdata/sparkexamples/Driver.scala
new file mode 100644
index 0000000..3b323b2
--- /dev/null
+++ b/src/main/scala/com/barrelsofdata/sparkexamples/Driver.scala
@@ -0,0 +1,21 @@
+package com.barrelsofdata.sparkexamples
+
+import org.apache.log4j.Logger
+import org.apache.spark.sql.SparkSession
+
+object Driver {
+
+  val JOB_NAME: String = "Boilerplate"
+  val LOG: Logger = Logger.getLogger(this.getClass.getCanonicalName)
+
+  def main(args: Array[String]): Unit = {
+
+    val spark: SparkSession = SparkSession.builder().appName(JOB_NAME).getOrCreate()
+    spark.sql("SELECT 'hello' AS col1").show()
+
+    LOG.info("Dummy info message")
+    LOG.warn("Dummy warn message")
+    LOG.error("Dummy error message")
+  }
+
+}
diff --git a/src/test/resources/log4j-test.properties b/src/test/resources/log4j-test.properties
new file mode 100644
index 0000000..bb8c065
--- /dev/null
+++ b/src/test/resources/log4j-test.properties
@@ -0,0 +1,16 @@
+log4j.rootLogger=INFO, console
+log4j.logger.com.barrelsofdata.sparkexamples=INFO, console
+log4j.additivity.com.barrelsofdata.sparkexamples=false
+
+log4j.appender.console=org.apache.log4j.ConsoleAppender
+log4j.appender.console.target=System.out
+log4j.appender.console.immediateFlush=true
+log4j.appender.console.encoding=UTF-8
+
+log4j.appender.console.layout=org.apache.log4j.PatternLayout
+log4j.appender.console.layout.conversionPattern=%d{yyyy/MM/dd HH:mm:ss} %p %c: %m%n
+
+log4j.logger.org.apache=ERROR
+log4j.logger.org.spark_project=ERROR
+log4j.logger.org.sparkproject=ERROR
+log4j.logger.parquet=ERROR
\ No newline at end of file
diff --git a/src/test/scala/com/barrelsofdata/sparkexamples/DriverTest.scala b/src/test/scala/com/barrelsofdata/sparkexamples/DriverTest.scala
new file mode 100644
index 0000000..4fe948a
--- /dev/null
+++ b/src/test/scala/com/barrelsofdata/sparkexamples/DriverTest.scala
@@ -0,0 +1,41 @@
+package com.barrelsofdata.sparkexamples
+
+import java.util.Properties
+
+import org.apache.log4j.{LogManager, Logger, PropertyConfigurator}
+import org.apache.spark.sql.SparkSession
+import org.scalatest.BeforeAndAfterAll
+import org.scalatest.funsuite.AnyFunSuite
+
+class DriverTest extends AnyFunSuite with BeforeAndAfterAll {
+
+  val JOB_NAME: String = "Driver Test Job"
+  val LOGGER_PROPERTIES: String = "log4j-test.properties"
+  val LOG: Logger = Logger.getLogger(this.getClass.getCanonicalName)
+
+  var spark: SparkSession = _
+
+  def setupLogger(): Unit = {
+    val properties = new Properties
+    properties.load(getClass.getClassLoader.getResource(LOGGER_PROPERTIES).openStream())
+    LogManager.resetConfiguration()
+    PropertyConfigurator.configure(properties)
+  }
+
+  override def beforeAll: Unit = {
+    setupLogger()
+    LOG.info("Setting up spark session")
+    spark = SparkSession.builder().appName(JOB_NAME).master("local[*]").getOrCreate()
+  }
+
+  test("Check if spark session is working") {
+    LOG.info("Testing spark job")
+    assertResult("hello")(spark.sql("SELECT 'hello'").collect().head.get(0))
+  }
+
+  override def afterAll: Unit = {
+    LOG.info("Closing spark session")
+    spark.close()
+  }
+
+}
\ No newline at end of file