spark-patches/spark-2.4.6_dynamic_allocation_support.patch

diff --git a/core/src/main/scala/org/apache/spark/Dependency.scala b/core/src/main/scala/org/apache/spark/Dependency.scala
index 9ea6d2fa2f..d6101cdcef 100644
--- a/core/src/main/scala/org/apache/spark/Dependency.scala
+++ b/core/src/main/scala/org/apache/spark/Dependency.scala
@@ -93,7 +93,9 @@ class ShuffleDependency[K: ClassTag, V: ClassTag, C: ClassTag](
   val shuffleHandle: ShuffleHandle = _rdd.context.env.shuffleManager.registerShuffle(
     shuffleId, _rdd.partitions.length, this)
 
-  _rdd.sparkContext.cleaner.foreach(_.registerShuffleForCleanup(this))
+  if (!_rdd.context.getConf.isRssEnable()) {
+    _rdd.sparkContext.cleaner.foreach(_.registerShuffleForCleanup(this))
+  }
 }
 
 
diff --git a/core/src/main/scala/org/apache/spark/ExecutorAllocationManager.scala b/core/src/main/scala/org/apache/spark/ExecutorAllocationManager.scala
index 38bed797a0..a95d4c7d77 100644
--- a/core/src/main/scala/org/apache/spark/ExecutorAllocationManager.scala
+++ b/core/src/main/scala/org/apache/spark/ExecutorAllocationManager.scala
@@ -212,7 +212,7 @@ private[spark] class ExecutorAllocationManager(
     }
     // Require external shuffle service for dynamic allocation
     // Otherwise, we may lose shuffle files when killing executors
-    if (!conf.get(config.SHUFFLE_SERVICE_ENABLED) && !testing) {
+    if (!conf.get(config.SHUFFLE_SERVICE_ENABLED) && !testing && !conf.isRssEnable()) {
       throw new SparkException("Dynamic allocation of executors requires the external " +
         "shuffle service. You may enable this through spark.shuffle.service.enabled.")
     }
diff --git a/core/src/main/scala/org/apache/spark/SparkConf.scala b/core/src/main/scala/org/apache/spark/SparkConf.scala
index 9b8be58c79..f9437a21c0 100644
--- a/core/src/main/scala/org/apache/spark/SparkConf.scala
+++ b/core/src/main/scala/org/apache/spark/SparkConf.scala
@@ -629,6 +629,10 @@ class SparkConf(loadDefaults: Boolean) extends Cloneable with Logging with Seria
     Utils.redact(this, getAll).sorted.map { case (k, v) => k + "=" + v }.mkString("\n")
   }
 
+  /**
+   * Return true if remote shuffle service is enabled.
+   */
+  def isRssEnable(): Boolean = get("spark.shuffle.manager", "sort").contains("RssShuffleManager")
 }
 
 private[spark] object SparkConf extends Logging {
diff --git a/core/src/main/scala/org/apache/spark/scheduler/DAGScheduler.scala b/core/src/main/scala/org/apache/spark/scheduler/DAGScheduler.scala
index 9d6a8faa89..df27576b66 100644
--- a/core/src/main/scala/org/apache/spark/scheduler/DAGScheduler.scala
+++ b/core/src/main/scala/org/apache/spark/scheduler/DAGScheduler.scala
@@ -1742,7 +1742,7 @@ private[spark] class DAGScheduler(
     // if the cluster manager explicitly tells us that the entire worker was lost, then
     // we know to unregister shuffle output.  (Note that "worker" specifically refers to the process
     // from a Standalone cluster, where the shuffle service lives in the Worker.)
-    val fileLost = workerLost || !env.blockManager.externalShuffleServiceEnabled
+    val fileLost = (workerLost || !env.blockManager.externalShuffleServiceEnabled) && !sc.getConf.isRssEnable()
     removeExecutorAndUnregisterOutputs(
       execId = execId,
       fileLost = fileLost,
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 459f575ba7..f563368fa5 100644
--- a/core/src/main/scala/org/apache/spark/scheduler/TaskSetManager.scala
+++ b/core/src/main/scala/org/apache/spark/scheduler/TaskSetManager.scala
@@ -975,7 +975,7 @@ private[spark] class TaskSetManager(
     // The reason is the next stage wouldn't be able to fetch the data from this dead executor
     // so we would need to rerun these tasks on other executors.
     if (tasks(0).isInstanceOf[ShuffleMapTask] && !env.blockManager.externalShuffleServiceEnabled
-        && !isZombie) {
+        && !isZombie && !conf.isRssEnable()) {
       for ((tid, info) <- taskInfos if info.executorId == execId) {
         val index = taskInfos(tid).index
         // We may have a running task whose partition has been marked as successful,
diff --git a/sql/core/src/main/scala/org/apache/spark/sql/execution/ShuffledRowRDD.scala b/sql/core/src/main/scala/org/apache/spark/sql/execution/ShuffledRowRDD.scala
index 021ce2eac0..50c52b0091 100644
--- a/sql/core/src/main/scala/org/apache/spark/sql/execution/ShuffledRowRDD.scala
+++ b/sql/core/src/main/scala/org/apache/spark/sql/execution/ShuffledRowRDD.scala
@@ -149,9 +149,13 @@ class ShuffledRowRDD(
   }
 
   override def getPreferredLocations(partition: Partition): Seq[String] = {
-    val tracker = SparkEnv.get.mapOutputTracker.asInstanceOf[MapOutputTrackerMaster]
-    val dep = dependencies.head.asInstanceOf[ShuffleDependency[_, _, _]]
-    tracker.getPreferredLocationsForShuffle(dep, partition.index)
+    if (!conf.isRssEnable()) {
+      val tracker = SparkEnv.get.mapOutputTracker.asInstanceOf[MapOutputTrackerMaster]
+      val dep = dependencies.head.asInstanceOf[ShuffleDependency[_, _, _]]
+      tracker.getPreferredLocationsForShuffle(dep, partition.index)
+    } else {
+      Nil
+    }
   }
 
   override def compute(split: Partition, context: TaskContext): Iterator[InternalRow] = {