[SPARK-7977] [BUILD] Disallowing println

Author: Jonathan Alter <jonalter@users.noreply.github.com>

Closes #7093 from jonalter/SPARK-7977 and squashes the following commits:

ccd44cc [Jonathan Alter] Changed println to log in ThreadingSuite
7fcac3e [Jonathan Alter] Reverting to println in ThreadingSuite
10724b6 [Jonathan Alter] Changing some printlns to logs in tests
eeec1e7 [Jonathan Alter] Merge branch 'master' of github.com:apache/spark into SPARK-7977
0b1dcb4 [Jonathan Alter] More println cleanup
aedaf80 [Jonathan Alter] Merge branch 'master' of github.com:apache/spark into SPARK-7977
925fd98 [Jonathan Alter] Merge branch 'master' of github.com:apache/spark into SPARK-7977
0c16fa3 [Jonathan Alter] Replacing some printlns with logs
45c7e05 [Jonathan Alter] Merge branch 'master' of github.com:apache/spark into SPARK-7977
5c8e283 [Jonathan Alter] Allowing println in audit-release examples
5b50da1 [Jonathan Alter] Allowing printlns in example files
ca4b477 [Jonathan Alter] Merge branch 'master' of github.com:apache/spark into SPARK-7977
83ab635 [Jonathan Alter] Fixing new printlns
54b131f [Jonathan Alter] Merge branch 'master' of github.com:apache/spark into SPARK-7977
1cd8a81 [Jonathan Alter] Removing some unnecessary comments and printlns
b837c3a [Jonathan Alter] Disallowing println

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

@@ -121,6 +121,7 @@ trait Logging {
     if (usingLog4j12) {
       val log4j12Initialized = LogManager.getRootLogger.getAllAppenders.hasMoreElements
       if (!log4j12Initialized) {
+        // scalastyle:off println
         if (Utils.isInInterpreter) {
           val replDefaultLogProps = "org/apache/spark/log4j-defaults-repl.properties"
           Option(Utils.getSparkClassLoader.getResource(replDefaultLogProps)) match {
@@ -141,6 +142,7 @@ trait Logging {
               System.err.println(s"Spark was unable to load $defaultLogProps")
           }
         }
+        // scalastyle:on println
       }
     }
     Logging.initialized = true

core/src/main/scala/org/apache/spark/api/r/RBackend.scala

@@ -95,7 +95,9 @@ private[spark] class RBackend {
 private[spark] object RBackend extends Logging {
   def main(args: Array[String]): Unit = {
     if (args.length < 1) {
+      // scalastyle:off println
       System.err.println("Usage: RBackend <tempFilePath>")
+      // scalastyle:on println
       System.exit(-1)
     }
     val sparkRBackend = new RBackend()

core/src/main/scala/org/apache/spark/api/r/RRDD.scala

@@ -161,7 +161,9 @@ private abstract class BaseRRDD[T: ClassTag, U: ClassTag](
               dataOut.write(elem.asInstanceOf[Array[Byte]])
             } else if (deserializer == SerializationFormats.STRING) {
               // write string(for StringRRDD)
+              // scalastyle:off println
               printOut.println(elem)
+              // scalastyle:on println
             }
           }
 

core/src/main/scala/org/apache/spark/deploy/Client.scala

@@ -118,26 +118,26 @@ private class ClientEndpoint(
   def pollAndReportStatus(driverId: String) {
     // Since ClientEndpoint is the only RpcEndpoint in the process, blocking the event loop thread
     // is fine.
-    println("... waiting before polling master for driver state")
+    logInfo("... waiting before polling master for driver state")
     Thread.sleep(5000)
-    println("... polling master for driver state")
+    logInfo("... polling master for driver state")
     val statusResponse =
       activeMasterEndpoint.askWithRetry[DriverStatusResponse](RequestDriverStatus(driverId))
     statusResponse.found match {
       case false =>
-        println(s"ERROR: Cluster master did not recognize $driverId")
+        logError(s"ERROR: Cluster master did not recognize $driverId")
         System.exit(-1)
       case true =>
-        println(s"State of $driverId is ${statusResponse.state.get}")
+        logInfo(s"State of $driverId is ${statusResponse.state.get}")
         // Worker node, if present
         (statusResponse.workerId, statusResponse.workerHostPort, statusResponse.state) match {
           case (Some(id), Some(hostPort), Some(DriverState.RUNNING)) =>
-            println(s"Driver running on $hostPort ($id)")
+            logInfo(s"Driver running on $hostPort ($id)")
           case _ =>
         }
         // Exception, if present
         statusResponse.exception.map { e =>
-          println(s"Exception from cluster was: $e")
+          logError(s"Exception from cluster was: $e")
           e.printStackTrace()
           System.exit(-1)
         }
@@ -148,7 +148,7 @@ private class ClientEndpoint(
   override def receive: PartialFunction[Any, Unit] = {
 
     case SubmitDriverResponse(master, success, driverId, message) =>
-      println(message)
+      logInfo(message)
       if (success) {
         activeMasterEndpoint = master
         pollAndReportStatus(driverId.get)
@@ -158,7 +158,7 @@ private class ClientEndpoint(
 
 
     case KillDriverResponse(master, driverId, success, message) =>
-      println(message)
+      logInfo(message)
       if (success) {
         activeMasterEndpoint = master
         pollAndReportStatus(driverId)
@@ -169,32 +169,32 @@ private class ClientEndpoint(
 
   override def onDisconnected(remoteAddress: RpcAddress): Unit = {
     if (!lostMasters.contains(remoteAddress)) {
-      println(s"Error connecting to master $remoteAddress.")
+      logError(s"Error connecting to master $remoteAddress.")
       lostMasters += remoteAddress
       // Note that this heuristic does not account for the fact that a Master can recover within
       // the lifetime of this client. Thus, once a Master is lost it is lost to us forever. This
       // is not currently a concern, however, because this client does not retry submissions.
       if (lostMasters.size >= masterEndpoints.size) {
-        println("No master is available, exiting.")
+        logError("No master is available, exiting.")
         System.exit(-1)
       }
     }
   }
 
   override def onNetworkError(cause: Throwable, remoteAddress: RpcAddress): Unit = {
     if (!lostMasters.contains(remoteAddress)) {
-      println(s"Error connecting to master ($remoteAddress).")
-      println(s"Cause was: $cause")
+      logError(s"Error connecting to master ($remoteAddress).")
+      logError(s"Cause was: $cause")
       lostMasters += remoteAddress
       if (lostMasters.size >= masterEndpoints.size) {
-        println("No master is available, exiting.")
+        logError("No master is available, exiting.")
         System.exit(-1)
       }
     }
   }
 
   override def onError(cause: Throwable): Unit = {
-    println(s"Error processing messages, exiting.")
+    logError(s"Error processing messages, exiting.")
     cause.printStackTrace()
     System.exit(-1)
   }
@@ -209,10 +209,12 @@ private class ClientEndpoint(
  */
 object Client {
   def main(args: Array[String]) {
+    // scalastyle:off println
     if (!sys.props.contains("SPARK_SUBMIT")) {
       println("WARNING: This client is deprecated and will be removed in a future version of Spark")
       println("Use ./bin/spark-submit with \"--master spark://host:port\"")
     }
+    // scalastyle:on println
 
     val conf = new SparkConf()
     val driverArgs = new ClientArguments(args)

core/src/main/scala/org/apache/spark/deploy/ClientArguments.scala

@@ -72,9 +72,11 @@ private[deploy] class ClientArguments(args: Array[String]) {
       cmd = "launch"
 
       if (!ClientArguments.isValidJarUrl(_jarUrl)) {
+        // scalastyle:off println
         println(s"Jar url '${_jarUrl}' is not in valid format.")
         println(s"Must be a jar file path in URL format " +
           "(e.g. hdfs://host:port/XX.jar, file:///XX.jar)")
+        // scalastyle:on println
         printUsageAndExit(-1)
       }
 
@@ -110,7 +112,9 @@ private[deploy] class ClientArguments(args: Array[String]) {
       |                                  (default: $DEFAULT_SUPERVISE)
       |   -v, --verbose                  Print more debugging output
      """.stripMargin
+    // scalastyle:off println
     System.err.println(usage)
+    // scalastyle:on println
     System.exit(exitCode)
   }
 }

core/src/main/scala/org/apache/spark/deploy/RRunner.scala

@@ -85,7 +85,9 @@ object RRunner {
       }
       System.exit(returnCode)
     } else {
+      // scalastyle:off println
       System.err.println("SparkR backend did not initialize in " + backendTimeout + " seconds")
+      // scalastyle:on println
       System.exit(-1)
     }
   }

core/src/main/scala/org/apache/spark/deploy/SparkSubmit.scala

@@ -82,6 +82,7 @@ object SparkSubmit {
 
   private val CLASS_NOT_FOUND_EXIT_STATUS = 101
 
+  // scalastyle:off println
   // Exposed for testing
   private[spark] var exitFn: Int => Unit = (exitCode: Int) => System.exit(exitCode)
   private[spark] var printStream: PrintStream = System.err
@@ -102,11 +103,14 @@ object SparkSubmit {
     printStream.println("Type --help for more information.")
     exitFn(0)
   }
+  // scalastyle:on println
 
   def main(args: Array[String]): Unit = {
     val appArgs = new SparkSubmitArguments(args)
     if (appArgs.verbose) {
+      // scalastyle:off println
       printStream.println(appArgs)
+      // scalastyle:on println
     }
     appArgs.action match {
       case SparkSubmitAction.SUBMIT => submit(appArgs)
@@ -160,7 +164,9 @@ object SparkSubmit {
             // makes the message printed to the output by the JVM not very helpful. Instead,
             // detect exceptions with empty stack traces here, and treat them differently.
             if (e.getStackTrace().length == 0) {
+              // scalastyle:off println
               printStream.println(s"ERROR: ${e.getClass().getName()}: ${e.getMessage()}")
+              // scalastyle:on println
               exitFn(1)
             } else {
               throw e
@@ -178,7 +184,9 @@ object SparkSubmit {
      // to use the legacy gateway if the master endpoint turns out to be not a REST server.
     if (args.isStandaloneCluster && args.useRest) {
       try {
+        // scalastyle:off println
         printStream.println("Running Spark using the REST application submission protocol.")
+        // scalastyle:on println
         doRunMain()
       } catch {
         // Fail over to use the legacy submission gateway
@@ -558,13 +566,15 @@ object SparkSubmit {
       sysProps: Map[String, String],
       childMainClass: String,
       verbose: Boolean): Unit = {
+    // scalastyle:off println
     if (verbose) {
       printStream.println(s"Main class:\n$childMainClass")
       printStream.println(s"Arguments:\n${childArgs.mkString("\n")}")
       printStream.println(s"System properties:\n${sysProps.mkString("\n")}")
       printStream.println(s"Classpath elements:\n${childClasspath.mkString("\n")}")
       printStream.println("\n")
     }
+    // scalastyle:on println
 
     val loader =
       if (sysProps.getOrElse("spark.driver.userClassPathFirst", "false").toBoolean) {
@@ -592,8 +602,10 @@ object SparkSubmit {
       case e: ClassNotFoundException =>
         e.printStackTrace(printStream)
         if (childMainClass.contains("thriftserver")) {
+          // scalastyle:off println
           printStream.println(s"Failed to load main class $childMainClass.")
           printStream.println("You need to build Spark with -Phive and -Phive-thriftserver.")
+          // scalastyle:on println
         }
         System.exit(CLASS_NOT_FOUND_EXIT_STATUS)
     }
@@ -766,7 +778,9 @@ private[spark] object SparkSubmitUtils {
         brr.setRoot(repo)
         brr.setName(s"repo-${i + 1}")
         cr.add(brr)
+        // scalastyle:off println
         printStream.println(s"$repo added as a remote repository with the name: ${brr.getName}")
+        // scalastyle:on println
       }
     }
 
@@ -829,7 +843,9 @@ private[spark] object SparkSubmitUtils {
       val ri = ModuleRevisionId.newInstance(mvn.groupId, mvn.artifactId, mvn.version)
       val dd = new DefaultDependencyDescriptor(ri, false, false)
       dd.addDependencyConfiguration(ivyConfName, ivyConfName)
+      // scalastyle:off println
       printStream.println(s"${dd.getDependencyId} added as a dependency")
+      // scalastyle:on println
       md.addDependency(dd)
     }
   }
@@ -896,9 +912,11 @@ private[spark] object SparkSubmitUtils {
             ivySettings.setDefaultCache(new File(alternateIvyCache, "cache"))
             new File(alternateIvyCache, "jars")
           }
+        // scalastyle:off println
         printStream.println(
           s"Ivy Default Cache set to: ${ivySettings.getDefaultCache.getAbsolutePath}")
         printStream.println(s"The jars for the packages stored in: $packagesDirectory")
+        // scalastyle:on println
         // create a pattern matcher
         ivySettings.addMatcher(new GlobPatternMatcher)
         // create the dependency resolvers

core/src/main/scala/org/apache/spark/deploy/SparkSubmitArguments.scala

@@ -79,13 +79,15 @@ private[deploy] class SparkSubmitArguments(args: Seq[String], env: Map[String, S
   /** Default properties present in the currently defined defaults file. */
   lazy val defaultSparkProperties: HashMap[String, String] = {
     val defaultProperties = new HashMap[String, String]()
+    // scalastyle:off println
     if (verbose) SparkSubmit.printStream.println(s"Using properties file: $propertiesFile")
     Option(propertiesFile).foreach { filename =>
       Utils.getPropertiesFromFile(filename).foreach { case (k, v) =>
         defaultProperties(k) = v
         if (verbose) SparkSubmit.printStream.println(s"Adding default property: $k=$v")
       }
     }
+    // scalastyle:on println
     defaultProperties
   }
 
@@ -452,6 +454,7 @@ private[deploy] class SparkSubmitArguments(args: Seq[String], env: Map[String, S
   }
 
   private def printUsageAndExit(exitCode: Int, unknownParam: Any = null): Unit = {
+    // scalastyle:off println
     val outStream = SparkSubmit.printStream
     if (unknownParam != null) {
       outStream.println("Unknown/unsupported param " + unknownParam)
@@ -541,6 +544,7 @@ private[deploy] class SparkSubmitArguments(args: Seq[String], env: Map[String, S
       outStream.println("CLI options:")
       outStream.println(getSqlShellOptions())
     }
+    // scalastyle:on println
 
     SparkSubmit.exitFn(exitCode)
   }

core/src/main/scala/org/apache/spark/deploy/client/TestExecutor.scala

@@ -19,7 +19,9 @@ package org.apache.spark.deploy.client
 
 private[spark] object TestExecutor {
   def main(args: Array[String]) {
+    // scalastyle:off println
     println("Hello world!")
+    // scalastyle:on println
     while (true) {
       Thread.sleep(1000)
     }

core/src/main/scala/org/apache/spark/deploy/history/HistoryServerArguments.scala

@@ -56,6 +56,7 @@ private[history] class HistoryServerArguments(conf: SparkConf, args: Array[Strin
    Utils.loadDefaultSparkProperties(conf, propertiesFile)
 
   private def printUsageAndExit(exitCode: Int) {
+    // scalastyle:off println
     System.err.println(
       """
       |Usage: HistoryServer [options]
@@ -84,6 +85,7 @@ private[history] class HistoryServerArguments(conf: SparkConf, args: Array[Strin
       |  spark.history.fs.updateInterval    How often to reload log data from storage
       |                                     (in seconds, default: 10)
       |""".stripMargin)
+    // scalastyle:on println
     System.exit(exitCode)
   }
 

core/src/main/scala/org/apache/spark/deploy/master/MasterArguments.scala

@@ -85,6 +85,7 @@ private[master] class MasterArguments(args: Array[String], conf: SparkConf) {
    * Print usage and exit JVM with the given exit code.
    */
   private def printUsageAndExit(exitCode: Int) {
+    // scalastyle:off println
     System.err.println(
       "Usage: Master [options]\n" +
       "\n" +
@@ -95,6 +96,7 @@ private[master] class MasterArguments(args: Array[String], conf: SparkConf) {
       "  --webui-port PORT      Port for web UI (default: 8080)\n" +
       "  --properties-file FILE Path to a custom Spark properties file.\n" +
       "                         Default is conf/spark-defaults.conf.")
+    // scalastyle:on println
     System.exit(exitCode)
   }
 }

core/src/main/scala/org/apache/spark/deploy/mesos/MesosClusterDispatcherArguments.scala

@@ -54,7 +54,9 @@ private[mesos] class MesosClusterDispatcherArguments(args: Array[String], conf:
 
     case ("--master" | "-m") :: value :: tail =>
       if (!value.startsWith("mesos://")) {
+        // scalastyle:off println
         System.err.println("Cluster dispatcher only supports mesos (uri begins with mesos://)")
+        // scalastyle:on println
         System.exit(1)
       }
       masterUrl = value.stripPrefix("mesos://")
@@ -73,7 +75,9 @@ private[mesos] class MesosClusterDispatcherArguments(args: Array[String], conf:
 
     case Nil => {
       if (masterUrl == null) {
+        // scalastyle:off println
         System.err.println("--master is required")
+        // scalastyle:on println
         printUsageAndExit(1)
       }
     }
@@ -83,6 +87,7 @@ private[mesos] class MesosClusterDispatcherArguments(args: Array[String], conf:
   }
 
   private def printUsageAndExit(exitCode: Int): Unit = {
+    // scalastyle:off println
     System.err.println(
       "Usage: MesosClusterDispatcher [options]\n" +
         "\n" +
@@ -96,6 +101,7 @@ private[mesos] class MesosClusterDispatcherArguments(args: Array[String], conf:
         "                          Zookeeper for persistence\n" +
         "  --properties-file FILE  Path to a custom Spark properties file.\n" +
         "                          Default is conf/spark-defaults.conf.")
+    // scalastyle:on println
     System.exit(exitCode)
   }
 }

core/src/main/scala/org/apache/spark/deploy/worker/DriverWrapper.scala

@@ -60,7 +60,9 @@ object DriverWrapper {
         rpcEnv.shutdown()
 
       case _ =>
+        // scalastyle:off println
         System.err.println("Usage: DriverWrapper <workerUrl> <userJar> <driverMainClass> [options]")
+        // scalastyle:on println
         System.exit(-1)
     }
   }