spark/src/test/scala/org/apache/druid/spark/SparkFunSuite.scala

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 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
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 *
 *   http://www.apache.org/licenses/LICENSE-2.0
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package org.apache.druid.spark

import org.apache.druid.java.util.common.FileUtils
import org.apache.druid.query.aggregation.datasketches.theta.SketchModule
import org.apache.spark.sql.SparkSession
import org.apache.spark.{SparkConf, SparkContext}
import org.scalatest.BeforeAndAfterEach
import org.scalatest.funsuite.AnyFunSuite

import java.io.File
import java.util.UUID
import scala.collection.JavaConverters.{asScalaBufferConverter, seqAsJavaListConverter}

class SparkFunSuite extends AnyFunSuite with BeforeAndAfterEach {
  private val localSparkContext = new ThreadLocal[SparkContext]
  private val localSparkSession = new ThreadLocal[SparkSession]

  def sparkContext: SparkContext = localSparkContext.get()
  def sparkSession: SparkSession = localSparkSession.get()

  private def setupSparkContextAndSession(): Unit = {
    val config = Map(
      "spark.master" -> "local[*]",
      "spark.driver.allowMultipleContexts" -> "true",
      "spark.ui.enabled" -> "false",
      "spark.local.dir" -> FileUtils.createTempDir("spark-tests").getAbsolutePath,
      "spark.default.parallelism" -> "1",
      "spark.sql.shuffle.partitions" -> "1"
    )

    val sparkConf = new SparkConf(loadDefaults = true)
    sparkConf.setAppName(UUID.randomUUID.toString)
    sparkConf.setAll(config)

    localSparkContext.set(new SparkContext(sparkConf))
    localSparkSession.set(SparkSession.builder.getOrCreate())
  }

  override def beforeEach(): Unit = {
    setupSparkContextAndSession()

    // This isn't necessary for any test to work, but it suppresses log spam when loading segment
    // metadata while reading data
    val jacksonModules = Seq(new SketchModule)
    MAPPER.registerModules(jacksonModules.flatMap(_.getJacksonModules.asScala.toList).asJava)
    super.beforeEach()
  }

  override def afterEach(): Unit = {
    super.afterEach()

    sparkContext.stop()
    FileUtils.deleteDirectory(new File(sparkContext.getConf.get("spark.local.dir")).getCanonicalFile)
  }
}