[SPARK-24337][Core] Improve error messages for Spark conf values

core/src/main/scala/org/apache/spark/SparkConf.scala

@@ -265,108 +265,121 @@ class SparkConf(loadDefaults: Boolean) extends Cloneable with Logging with Seria
    * Get a time parameter as seconds; throws a NoSuchElementException if it's not set. If no
    * suffix is provided then seconds are assumed.
    * @throws java.util.NoSuchElementException If the time parameter is not set
+   * @throws NumberFormatException If the value cannot be interpreted as seconds
    */
-  def getTimeAsSeconds(key: String): Long = {
+  def getTimeAsSeconds(key: String): Long = catchIllegalValue(key) {
     Utils.timeStringAsSeconds(get(key))
   }
 
   /**
    * Get a time parameter as seconds, falling back to a default if not set. If no
    * suffix is provided then seconds are assumed.
+   * @throws NumberFormatException If the value cannot be interpreted as seconds
    */
-  def getTimeAsSeconds(key: String, defaultValue: String): Long = {
+  def getTimeAsSeconds(key: String, defaultValue: String): Long = catchIllegalValue(key) {
     Utils.timeStringAsSeconds(get(key, defaultValue))
   }
 
   /**
    * Get a time parameter as milliseconds; throws a NoSuchElementException if it's not set. If no
    * suffix is provided then milliseconds are assumed.
    * @throws java.util.NoSuchElementException If the time parameter is not set
+   * @throws NumberFormatException If the value cannot be interpreted as milliseconds
    */
-  def getTimeAsMs(key: String): Long = {
+  def getTimeAsMs(key: String): Long = catchIllegalValue(key) {
     Utils.timeStringAsMs(get(key))
   }
 
   /**
    * Get a time parameter as milliseconds, falling back to a default if not set. If no
    * suffix is provided then milliseconds are assumed.
+   * @throws NumberFormatException If the value cannot be interpreted as milliseconds
    */
-  def getTimeAsMs(key: String, defaultValue: String): Long = {
+  def getTimeAsMs(key: String, defaultValue: String): Long = catchIllegalValue(key) {
     Utils.timeStringAsMs(get(key, defaultValue))
   }
 
   /**
    * Get a size parameter as bytes; throws a NoSuchElementException if it's not set. If no
    * suffix is provided then bytes are assumed.
    * @throws java.util.NoSuchElementException If the size parameter is not set
+   * @throws NumberFormatException If the value cannot be interpreted as bytes
    */
-  def getSizeAsBytes(key: String): Long = {
+  def getSizeAsBytes(key: String): Long = catchIllegalValue(key) {
     Utils.byteStringAsBytes(get(key))
   }
 
   /**
    * Get a size parameter as bytes, falling back to a default if not set. If no
    * suffix is provided then bytes are assumed.
+   * @throws NumberFormatException If the value cannot be interpreted as bytes
    */
-  def getSizeAsBytes(key: String, defaultValue: String): Long = {
+  def getSizeAsBytes(key: String, defaultValue: String): Long = catchIllegalValue(key) {
     Utils.byteStringAsBytes(get(key, defaultValue))
   }
 
   /**
    * Get a size parameter as bytes, falling back to a default if not set.
+   * @throws NumberFormatException If the value cannot be interpreted as bytes
    */
-  def getSizeAsBytes(key: String, defaultValue: Long): Long = {
+  def getSizeAsBytes(key: String, defaultValue: Long): Long = catchIllegalValue(key) {
     Utils.byteStringAsBytes(get(key, defaultValue + "B"))
   }
 
   /**
    * Get a size parameter as Kibibytes; throws a NoSuchElementException if it's not set. If no
    * suffix is provided then Kibibytes are assumed.
    * @throws java.util.NoSuchElementException If the size parameter is not set
+   * @throws NumberFormatException If the value cannot be interpreted as Kibibytes
    */
-  def getSizeAsKb(key: String): Long = {
+  def getSizeAsKb(key: String): Long = catchIllegalValue(key) {
     Utils.byteStringAsKb(get(key))
   }
 
   /**
    * Get a size parameter as Kibibytes, falling back to a default if not set. If no
    * suffix is provided then Kibibytes are assumed.
+   * @throws NumberFormatException If the value cannot be interpreted as Kibibytes
    */
-  def getSizeAsKb(key: String, defaultValue: String): Long = {
+  def getSizeAsKb(key: String, defaultValue: String): Long = catchIllegalValue(key) {
     Utils.byteStringAsKb(get(key, defaultValue))
   }
 
   /**
    * Get a size parameter as Mebibytes; throws a NoSuchElementException if it's not set. If no
    * suffix is provided then Mebibytes are assumed.
    * @throws java.util.NoSuchElementException If the size parameter is not set
+   * @throws NumberFormatException If the value cannot be interpreted as Mebibytes
    */
-  def getSizeAsMb(key: String): Long = {
+  def getSizeAsMb(key: String): Long = catchIllegalValue(key) {
     Utils.byteStringAsMb(get(key))
   }
 
   /**
    * Get a size parameter as Mebibytes, falling back to a default if not set. If no
    * suffix is provided then Mebibytes are assumed.
+   * @throws NumberFormatException If the value cannot be interpreted as Mebibytes
    */
-  def getSizeAsMb(key: String, defaultValue: String): Long = {
+  def getSizeAsMb(key: String, defaultValue: String): Long = catchIllegalValue(key) {
     Utils.byteStringAsMb(get(key, defaultValue))
   }
 
   /**
    * Get a size parameter as Gibibytes; throws a NoSuchElementException if it's not set. If no
    * suffix is provided then Gibibytes are assumed.
    * @throws java.util.NoSuchElementException If the size parameter is not set
+   * @throws NumberFormatException If the value cannot be interpreted as Gibibytes
    */
-  def getSizeAsGb(key: String): Long = {
+  def getSizeAsGb(key: String): Long = catchIllegalValue(key) {
     Utils.byteStringAsGb(get(key))
   }
 
   /**
    * Get a size parameter as Gibibytes, falling back to a default if not set. If no
    * suffix is provided then Gibibytes are assumed.
+   * @throws NumberFormatException If the value cannot be interpreted as Gibibytes
    */
-  def getSizeAsGb(key: String, defaultValue: String): Long = {
+  def getSizeAsGb(key: String, defaultValue: String): Long = catchIllegalValue(key) {
     Utils.byteStringAsGb(get(key, defaultValue))
   }
 
@@ -394,23 +407,35 @@ class SparkConf(loadDefaults: Boolean) extends Cloneable with Logging with Seria
   }
 
 
-  /** Get a parameter as an integer, falling back to a default if not set */
-  def getInt(key: String, defaultValue: Int): Int = {
+  /**
+   * Get a parameter as an integer, falling back to a default if not set
+   * @throws NumberFormatException If the value cannot be interpreted as an integer
+   */
+  def getInt(key: String, defaultValue: Int): Int = catchIllegalValue(key) {
     getOption(key).map(_.toInt).getOrElse(defaultValue)
   }
 
-  /** Get a parameter as a long, falling back to a default if not set */
-  def getLong(key: String, defaultValue: Long): Long = {
+  /**
+   * Get a parameter as a long, falling back to a default if not set
+   * @throws NumberFormatException If the value cannot be interpreted as a long
+   */
+  def getLong(key: String, defaultValue: Long): Long = catchIllegalValue(key) {
     getOption(key).map(_.toLong).getOrElse(defaultValue)
   }
 
-  /** Get a parameter as a double, falling back to a default if not set */
-  def getDouble(key: String, defaultValue: Double): Double = {
+  /**
+   * Get a parameter as a double, falling back to a default if not ste
+   * @throws NumberFormatException If the value cannot be interpreted as a double
+   */
+  def getDouble(key: String, defaultValue: Double): Double = catchIllegalValue(key) {
     getOption(key).map(_.toDouble).getOrElse(defaultValue)
   }
 
-  /** Get a parameter as a boolean, falling back to a default if not set */
-  def getBoolean(key: String, defaultValue: Boolean): Boolean = {
+  /**
+   * Get a parameter as a boolean, falling back to a default if not set
+   * @throws IllegalArgumentException If the value cannot be interpreted as a boolean
+   */
+  def getBoolean(key: String, defaultValue: Boolean): Boolean = catchIllegalValue(key) {
     getOption(key).map(_.toBoolean).getOrElse(defaultValue)
   }
 
@@ -448,6 +473,24 @@ class SparkConf(loadDefaults: Boolean) extends Cloneable with Logging with Seria
    */
   private[spark] def getenv(name: String): String = System.getenv(name)
 
+  /**
+   * Wrapper method for get() methods which require some specific value format. This catches
+   * any [[NumberFormatException]] or [[IllegalArgumentException]] and re-raises it with the
+   * incorrectly configured key in the exception message.
+   */
+  private def catchIllegalValue[T](key: String)(getValue: => T): T = {
+    try {
+      getValue
+    } catch {
+      case e: NumberFormatException =>
+        // NumberFormatException doesn't have a constructor that takes a cause for some reason.
+        throw new NumberFormatException(s"Illegal value for config key $key: ${e.getMessage}")
+            .initCause(e)
+      case e: IllegalArgumentException =>
+        throw new IllegalArgumentException(s"Illegal value for config key $key: ${e.getMessage}", e)
+    }
+  }
+
   /**
    * Checks for illegal or deprecated config settings. Throws an exception for the former. Not
    * idempotent - may mutate this conf object to convert deprecated settings to supported ones.

core/src/test/scala/org/apache/spark/SparkConfSuite.scala

@@ -339,6 +339,38 @@ class SparkConfSuite extends SparkFunSuite with LocalSparkContext with ResetSyst
     }
   }
 
+  val defaultIllegalValue = "SomeIllegalValue"
+  val illegalValueTests : Map[String, (SparkConf, String) => Any] = Map(
+    "getTimeAsSeconds" -> (_.getTimeAsSeconds(_)),
+    "getTimeAsSeconds with default" -> (_.getTimeAsSeconds(_, defaultIllegalValue)),
+    "getTimeAsMs" -> (_.getTimeAsMs(_)),
+    "getTimeAsMs with default" -> (_.getTimeAsMs(_, defaultIllegalValue)),
+    "getSizeAsBytes" -> (_.getSizeAsBytes(_)),
+    "getSizeAsBytes with default string" -> (_.getSizeAsBytes(_, defaultIllegalValue)),
+    "getSizeAsBytes with default long" -> (_.getSizeAsBytes(_, 0L)),
+    "getSizeAsKb" -> (_.getSizeAsKb(_)),
+    "getSizeAsKb with default" -> (_.getSizeAsKb(_, defaultIllegalValue)),
+    "getSizeAsMb" -> (_.getSizeAsMb(_)),
+    "getSizeAsMb with default" -> (_.getSizeAsMb(_, defaultIllegalValue)),
+    "getSizeAsGb" -> (_.getSizeAsGb(_)),
+    "getSizeAsGb with default" -> (_.getSizeAsGb(_, defaultIllegalValue)),
+    "getInt" -> (_.getInt(_, 0)),
+    "getLong" -> (_.getLong(_, 0L)),
+    "getDouble" -> (_.getDouble(_, 0.0)),
+    "getBoolean" -> (_.getBoolean(_, false))
+  )
+
+  illegalValueTests.foreach { case (name, getValue) =>
+    test(s"SPARK-24337: $name throws an useful error message with key name") {
+      val key = "SomeKey"
+      val conf = new SparkConf()
+      conf.set(key, "SomeInvalidValue")
+      val thrown = intercept[IllegalArgumentException] {
+        getValue(conf, key)
+      }
+      assert(thrown.getMessage.contains(key))
+    }
+  }
 }
 
 class Class1 {}