SPARK-781: Log the temp directory path when Spark says "Failed to create

temp directory".

core/src/main/scala/spark/Utils.scala

@@ -116,8 +116,8 @@ private object Utils extends Logging {
     while (dir == null) {
       attempts += 1
       if (attempts > maxAttempts) {
-        throw new IOException("Failed to create a temp directory after " + maxAttempts +
-            " attempts!")
+        throw new IOException("Failed to create a temp directory under (" + root + ") after " +
+          maxAttempts + " attempts!")
       }
       try {
         dir = new File(root, "spark-" + UUID.randomUUID.toString)

core/src/main/scala/spark/storage/DiskStore.scala

@@ -82,15 +82,15 @@ private class DiskStore(blockManager: BlockManager, rootDirs: String)
     override def size(): Long = lastValidPosition
   }
 
-  val MAX_DIR_CREATION_ATTEMPTS: Int = 10
-  val subDirsPerLocalDir = System.getProperty("spark.diskStore.subDirectories", "64").toInt
+  private val MAX_DIR_CREATION_ATTEMPTS: Int = 10
+  private val subDirsPerLocalDir = System.getProperty("spark.diskStore.subDirectories", "64").toInt
 
-  var shuffleSender : ShuffleSender = null
+  private var shuffleSender : ShuffleSender = null
   // Create one local directory for each path mentioned in spark.local.dir; then, inside this
   // directory, create multiple subdirectories that we will hash files into, in order to avoid
   // having really large inodes at the top level.
-  val localDirs = createLocalDirs()
-  val subDirs = Array.fill(localDirs.length)(new Array[File](subDirsPerLocalDir))
+  private val localDirs: Array[File] = createLocalDirs()
+  private val subDirs = Array.fill(localDirs.length)(new Array[File](subDirsPerLocalDir))
 
   addShutdownHook()
 
@@ -99,7 +99,6 @@ private class DiskStore(blockManager: BlockManager, rootDirs: String)
     new DiskBlockObjectWriter(blockId, serializer, bufferSize)
   }
 
-
   override def getSize(blockId: String): Long = {
     getFile(blockId).length()
   }
@@ -232,8 +231,8 @@ private class DiskStore(blockManager: BlockManager, rootDirs: String)
   private def createLocalDirs(): Array[File] = {
     logDebug("Creating local directories at root dirs '" + rootDirs + "'")
     val dateFormat = new SimpleDateFormat("yyyyMMddHHmmss")
-    rootDirs.split(",").map(rootDir => {
-      var foundLocalDir: Boolean = false
+    rootDirs.split(",").map { rootDir =>
+      var foundLocalDir = false
       var localDir: File = null
       var localDirId: String = null
       var tries = 0
@@ -248,7 +247,7 @@ private class DiskStore(blockManager: BlockManager, rootDirs: String)
           }
         } catch {
           case e: Exception =>
-            logWarning("Attempt " + tries + " to create local dir failed", e)
+            logWarning("Attempt " + tries + " to create local dir " + localDir + " failed", e)
         }
       }
       if (!foundLocalDir) {
@@ -258,7 +257,7 @@ private class DiskStore(blockManager: BlockManager, rootDirs: String)
       }
       logInfo("Created local directory at " + localDir)
       localDir
-    })
+    }
   }
 
   private def addShutdownHook() {
@@ -266,15 +265,16 @@ private class DiskStore(blockManager: BlockManager, rootDirs: String)
     Runtime.getRuntime.addShutdownHook(new Thread("delete Spark local dirs") {
       override def run() {
         logDebug("Shutdown hook called")
-        try {
-          localDirs.foreach { localDir =>
+        localDirs.foreach { localDir =>
+          try {
             if (!Utils.hasRootAsShutdownDeleteDir(localDir)) Utils.deleteRecursively(localDir)
+          } catch {
+            case t: Throwable =>
+              logError("Exception while deleting local spark dir: " + localDir, t)
           }
-          if (shuffleSender != null) {
-            shuffleSender.stop
-          }
-        } catch {
-          case t: Throwable => logError("Exception while deleting local spark dirs", t)
+        }
+        if (shuffleSender != null) {
+          shuffleSender.stop
         }
       }
     })