Modified confliction of MimExcludes

core/src/main/scala/org/apache/spark/network/ManagedBuffer.scala

@@ -17,15 +17,17 @@
 
 package org.apache.spark.network
 
-import java.io.{FileInputStream, RandomAccessFile, File, InputStream}
+import java.io._
 import java.nio.ByteBuffer
 import java.nio.channels.FileChannel
 import java.nio.channels.FileChannel.MapMode
 
+import scala.util.Try
+
 import com.google.common.io.ByteStreams
 import io.netty.buffer.{ByteBufInputStream, ByteBuf}
 
-import org.apache.spark.util.ByteBufferInputStream
+import org.apache.spark.util.{ByteBufferInputStream, Utils}
 
 
 /**
@@ -71,18 +73,47 @@ final class FileSegmentManagedBuffer(val file: File, val offset: Long, val lengt
     try {
       channel = new RandomAccessFile(file, "r").getChannel
       channel.map(MapMode.READ_ONLY, offset, length)
+    } catch {
+      case e: IOException =>
+        Try(channel.size).toOption match {
+          case Some(fileLen) =>
+            throw new IOException(s"Error in reading $this (actual file length $fileLen)", e)
+          case None =>
+            throw new IOException(s"Error in opening $this", e)
+        }
     } finally {
       if (channel != null) {
-        channel.close()
+        Utils.tryLog(channel.close())
       }
     }
   }
 
   override def inputStream(): InputStream = {
-    val is = new FileInputStream(file)
-    is.skip(offset)
-    ByteStreams.limit(is, length)
+    var is: FileInputStream = null
+    try {
+      is = new FileInputStream(file)
+      is.skip(offset)
+      ByteStreams.limit(is, length)
+    } catch {
+      case e: IOException =>
+        if (is != null) {
+          Utils.tryLog(is.close())
+        }
+        Try(file.length).toOption match {
+          case Some(fileLen) =>
+            throw new IOException(s"Error in reading $this (actual file length $fileLen)", e)
+          case None =>
+            throw new IOException(s"Error in opening $this", e)
+        }
+      case e: Throwable =>
+        if (is != null) {
+          Utils.tryLog(is.close())
+        }
+        throw e
+    }
   }
+
+  override def toString: String = s"${getClass.getName}($file, $offset, $length)"
 }
 
 

core/src/main/scala/org/apache/spark/scheduler/DAGScheduler.scala

@@ -1209,7 +1209,7 @@ class DAGScheduler(
             .format(job.jobId, stageId))
       } else if (jobsForStage.get.size == 1) {
         if (!stageIdToStage.contains(stageId)) {
-          logError("Missing Stage for stage with id $stageId")
+          logError(s"Missing Stage for stage with id $stageId")
         } else {
           // This is the only job that uses this stage, so fail the stage if it is running.
           val stage = stageIdToStage(stageId)

core/src/main/scala/org/apache/spark/util/Utils.scala

@@ -1304,6 +1304,20 @@ private[spark] object Utils extends Logging {
     }
   }
 
+  /** Executes the given block in a Try, logging any uncaught exceptions. */
+  def tryLog[T](f: => T): Try[T] = {
+    try {
+      val res = f
+      scala.util.Success(res)
+    } catch {
+      case ct: ControlThrowable =>
+        throw ct
+      case t: Throwable =>
+        logError(s"Uncaught exception in thread ${Thread.currentThread().getName}", t)
+        scala.util.Failure(t)
+    }
+  }
+
   /** Returns true if the given exception was fatal. See docs for scala.util.control.NonFatal. */
   def isFatalError(e: Throwable): Boolean = {
     e match {

core/src/main/scala/org/apache/spark/util/collection/ExternalSorter.scala

@@ -144,7 +144,7 @@ private[spark] class ExternalSorter[K, V, C](
     override def compare(a: K, b: K): Int = {
       val h1 = if (a == null) 0 else a.hashCode()
       val h2 = if (b == null) 0 else b.hashCode()
-      h1 - h2
+      if (h1 < h2) -1 else if (h1 == h2) 0 else 1
     }
   })
 

core/src/test/scala/org/apache/spark/util/collection/ExternalSorterSuite.scala

@@ -24,6 +24,8 @@ import org.scalatest.{PrivateMethodTester, FunSuite}
 import org.apache.spark._
 import org.apache.spark.SparkContext._
 
+import scala.util.Random
+
 class ExternalSorterSuite extends FunSuite with LocalSparkContext with PrivateMethodTester {
   private def createSparkConf(loadDefaults: Boolean): SparkConf = {
     val conf = new SparkConf(loadDefaults)
@@ -707,4 +709,57 @@ class ExternalSorterSuite extends FunSuite with LocalSparkContext with PrivateMe
       Some(agg), Some(new HashPartitioner(FEW_PARTITIONS)), None, None)
     assertDidNotBypassMergeSort(sorter4)
   }
+
+  test("sort without breaking sorting contracts") {
+    val conf = createSparkConf(true)
+    conf.set("spark.shuffle.memoryFraction", "0.01")
+    conf.set("spark.shuffle.manager", "sort")
+    sc = new SparkContext("local-cluster[1,1,512]", "test", conf)
+
+    // Using wrongOrdering to show integer overflow introduced exception.
+    val rand = new Random(100L)
+    val wrongOrdering = new Ordering[String] {
+      override def compare(a: String, b: String) = {
+        val h1 = if (a == null) 0 else a.hashCode()
+        val h2 = if (b == null) 0 else b.hashCode()
+        h1 - h2
+      }
+    }
+
+    val testData = Array.tabulate(100000) { _ => rand.nextInt().toString }
+
+    val sorter1 = new ExternalSorter[String, String, String](
+      None, None, Some(wrongOrdering), None)
+    val thrown = intercept[IllegalArgumentException] {
+      sorter1.insertAll(testData.iterator.map(i => (i, i)))
+      sorter1.iterator
+    }
+
+    assert(thrown.getClass() === classOf[IllegalArgumentException])
+    assert(thrown.getMessage().contains("Comparison method violates its general contract"))
+    sorter1.stop()
+
+    // Using aggregation and external spill to make sure ExternalSorter using
+    // partitionKeyComparator.
+    def createCombiner(i: String) = ArrayBuffer(i)
+    def mergeValue(c: ArrayBuffer[String], i: String) = c += i
+    def mergeCombiners(c1: ArrayBuffer[String], c2: ArrayBuffer[String]) = c1 ++= c2
+
+    val agg = new Aggregator[String, String, ArrayBuffer[String]](
+      createCombiner, mergeValue, mergeCombiners)
+
+    val sorter2 = new ExternalSorter[String, String, ArrayBuffer[String]](
+      Some(agg), None, None, None)
+    sorter2.insertAll(testData.iterator.map(i => (i, i)))
+
+    // To validate the hash ordering of key
+    var minKey = Int.MinValue
+    sorter2.iterator.foreach { case (k, v) =>
+      val h = k.hashCode()
+      assert(h >= minKey)
+      minKey = h
+    }
+
+    sorter2.stop()
+ }
 }