[SPARK-13371][CORE][STRING] TaskSetManager.dequeueSpeculativeTask compares Option and String directly.

## What changes were proposed in this pull request?

Fix some comparisons between unequal types that cause IJ warnings and in at least one case a likely bug (TaskSetManager)

## How was the this patch tested?

Running Jenkins tests

Author: Sean Owen <sowen@cloudera.com>

Closes #11253 from srowen/SPARK-13371.

5 files changed, 11 insertions, 7 deletions

diff --git a/core/src/main/scala/org/apache/spark/deploy/FaultToleranceTest.scala b/core/src/main/scala/org/apache/spark/deploy/FaultToleranceTest.scala
index 15d220d01b..434aadd2c6 100644
--- a/core/src/main/scala/org/apache/spark/deploy/FaultToleranceTest.scala
+++ b/core/src/main/scala/org/apache/spark/deploy/FaultToleranceTest.scala
@@ -252,7 +252,7 @@ private object FaultToleranceTest extends App with Logging {
     val f = Future {
       try {
         val res = sc.parallelize(0 until 10).collect()
-        assertTrue(res.toList == (0 until 10))
+        assertTrue(res.toList == (0 until 10).toList)
         true
       } catch {
         case e: Exception =>
diff --git a/core/src/main/scala/org/apache/spark/scheduler/TaskSetManager.scala b/core/src/main/scala/org/apache/spark/scheduler/TaskSetManager.scala
index 05cfa52f16..2b0eab7169 100644
--- a/core/src/main/scala/org/apache/spark/scheduler/TaskSetManager.scala
+++ b/core/src/main/scala/org/apache/spark/scheduler/TaskSetManager.scala
@@ -338,7 +338,7 @@ private[spark] class TaskSetManager(
       if (TaskLocality.isAllowed(locality, TaskLocality.RACK_LOCAL)) {
         for (rack <- sched.getRackForHost(host)) {
           for (index <- speculatableTasks if canRunOnHost(index)) {
-            val racks = tasks(index).preferredLocations.map(_.host).map(sched.getRackForHost)
+            val racks = tasks(index).preferredLocations.map(_.host).flatMap(sched.getRackForHost)
             if (racks.contains(rack)) {
               speculatableTasks -= index
               return Some((index, TaskLocality.RACK_LOCAL))
diff --git a/core/src/test/scala/org/apache/spark/CheckpointSuite.scala b/core/src/test/scala/org/apache/spark/CheckpointSuite.scala
index ce35856dce..9f94e36324 100644
--- a/core/src/test/scala/org/apache/spark/CheckpointSuite.scala
+++ b/core/src/test/scala/org/apache/spark/CheckpointSuite.scala
@@ -54,7 +54,7 @@ trait RDDCheckpointTester { self: SparkFunSuite =>
     // Generate the final RDD using given RDD operation
     val baseRDD = generateFatRDD()
     val operatedRDD = op(baseRDD)
-    val parentRDD = operatedRDD.dependencies.headOption.orNull
+    val parentDependency = operatedRDD.dependencies.headOption.orNull
     val rddType = operatedRDD.getClass.getSimpleName
     val numPartitions = operatedRDD.partitions.length
 
@@ -82,7 +82,7 @@ trait RDDCheckpointTester { self: SparkFunSuite =>
     }
 
     // Test whether dependencies have been changed from its earlier parent RDD
-    assert(operatedRDD.dependencies.head.rdd != parentRDD)
+    assert(operatedRDD.dependencies.head != parentDependency)
 
     // Test whether the partitions have been changed from its earlier partitions
     assert(operatedRDD.partitions.toList != partitionsBeforeCheckpoint.toList)
diff --git a/core/src/test/scala/org/apache/spark/PartitioningSuite.scala b/core/src/test/scala/org/apache/spark/PartitioningSuite.scala
index aa8028792c..3d31c7864e 100644
--- a/core/src/test/scala/org/apache/spark/PartitioningSuite.scala
+++ b/core/src/test/scala/org/apache/spark/PartitioningSuite.scala
@@ -163,8 +163,8 @@ class PartitioningSuite extends SparkFunSuite with SharedSparkContext with Priva
     val hashP2 = new HashPartitioner(2)
     assert(rangeP2 === rangeP2)
     assert(hashP2 === hashP2)
-    assert(hashP2 != rangeP2)
-    assert(rangeP2 != hashP2)
+    assert(hashP2 !== rangeP2)
+    assert(rangeP2 !== hashP2)
   }
 
   test("partitioner preservation") {
diff --git a/core/src/test/scala/org/apache/spark/ui/UISeleniumSuite.scala b/core/src/test/scala/org/apache/spark/ui/UISeleniumSuite.scala
index aa22f3ba2b..b0a35fe8c3 100644
--- a/core/src/test/scala/org/apache/spark/ui/UISeleniumSuite.scala
+++ b/core/src/test/scala/org/apache/spark/ui/UISeleniumSuite.scala
@@ -289,7 +289,11 @@ class UISeleniumSuite extends SparkFunSuite with WebBrowser with Matchers with B
         JInt(stageId) <- stage \ "stageId"
         JInt(attemptId) <- stage \ "attemptId"
       } {
-        val exp = if (attemptId == 0 && stageId == 1) StageStatus.FAILED else StageStatus.COMPLETE
+        val exp = if (attemptId.toInt == 0 && stageId.toInt == 1) {
+          StageStatus.FAILED
+        } else {
+          StageStatus.COMPLETE
+        }
         status should be (exp.name())
       }