Fix tests

core/src/main/scala/org/apache/spark/shuffle/ShuffleMemoryManager.scala

@@ -19,7 +19,7 @@ package org.apache.spark.shuffle
 
 import scala.collection.mutable
 
-import org.apache.spark.{Logging, SparkException, SparkConf}
+import org.apache.spark.{Logging, SparkConf, SparkEnv, SparkException}
 
 /**
  * Allocates a pool of memory to task threads for use in shuffle operations. Each disk-spilling
@@ -124,5 +124,5 @@ private[spark] object ShuffleMemoryManager {
   }
 
   // Initial threshold for the size of a collection before we start tracking its memory usage
-  val INITIAL_MEMORY_TRACKING_THRESHOLD: Long = 5 * 1024 * 1024
+  val DEFAULT_INITIAL_MEMORY_THRESHOLD: Long = 5 * 1024 * 1024
 }

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

@@ -82,9 +82,14 @@ class ExternalAppendOnlyMap[K, V, C](
   // Number of in-memory pairs inserted before tracking the map's shuffle memory usage
   private val trackMemoryThreshold = 1000
 
+  // Initial threshold for the size of a collection before we start tracking its memory usage
+  private val initialMemoryThreshold =
+    SparkEnv.get.conf.getLong("spark.shuffle.spill.initialMemoryThreshold",
+      ShuffleMemoryManager.DEFAULT_INITIAL_MEMORY_THRESHOLD)
+
   // Threshold for the collection's size in bytes before we start tracking its memory usage
   // To avoid a large number of small spills, initialize this to a value orders of magnitude > 0
-  private var myMemoryThreshold = ShuffleMemoryManager.INITIAL_MEMORY_TRACKING_THRESHOLD
+  private var myMemoryThreshold = initialMemoryThreshold
 
   /**
    * Size of object batches when reading/writing from serializers.
@@ -238,11 +243,10 @@ class ExternalAppendOnlyMap[K, V, C](
 
     // Release our memory back to the shuffle pool so that other threads can grab it
     // The amount we requested does not include the initial memory tracking threshold
-    shuffleMemoryManager.release(
-      myMemoryThreshold - ShuffleMemoryManager.INITIAL_MEMORY_TRACKING_THRESHOLD)
+    shuffleMemoryManager.release(myMemoryThreshold - initialMemoryThreshold)
 
     // Reset this to the initial threshold to avoid spilling many small files
-    myMemoryThreshold = ShuffleMemoryManager.INITIAL_MEMORY_TRACKING_THRESHOLD
+    myMemoryThreshold = initialMemoryThreshold
 
     elementsRead = 0
     _memoryBytesSpilled += mapSize

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

@@ -135,9 +135,14 @@ private[spark] class ExternalSorter[K, V, C](
   // Write metrics for current spill
   private var curWriteMetrics: ShuffleWriteMetrics = _
 
+  // Initial threshold for the size of a collection before we start tracking its memory usage
+  private val initialMemoryThreshold =
+    SparkEnv.get.conf.getLong("spark.shuffle.spill.initialMemoryThreshold",
+      ShuffleMemoryManager.DEFAULT_INITIAL_MEMORY_THRESHOLD)
+
   // Threshold for the collection's size in bytes before we start tracking its memory usage
   // To avoid a large number of small spills, initialize this to a value orders of magnitude > 0
-  private var myMemoryThreshold = ShuffleMemoryManager.INITIAL_MEMORY_TRACKING_THRESHOLD
+  private var myMemoryThreshold = initialMemoryThreshold
 
   // If there are fewer than spark.shuffle.sort.bypassMergeThreshold partitions and we don't need
   // local aggregation and sorting, write numPartitions files directly and just concatenate them
@@ -287,11 +292,10 @@ private[spark] class ExternalSorter[K, V, C](
 
     // Release our memory back to the shuffle pool so that other threads can grab it
     // The amount we requested does not include the initial memory tracking threshold
-    shuffleMemoryManager.release(
-      myMemoryThreshold - ShuffleMemoryManager.INITIAL_MEMORY_TRACKING_THRESHOLD)
+    shuffleMemoryManager.release(myMemoryThreshold - initialMemoryThreshold)
 
     // Reset this to the initial threshold to avoid spilling many small files
-    myMemoryThreshold = ShuffleMemoryManager.INITIAL_MEMORY_TRACKING_THRESHOLD
+    myMemoryThreshold = initialMemoryThreshold
 
     _memoryBytesSpilled += memorySize
     elementsRead = 0

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

@@ -127,6 +127,7 @@ class ExternalSorterSuite extends FunSuite with LocalSparkContext with PrivateMe
   test("empty partitions with spilling") {
     val conf = createSparkConf(false)
     conf.set("spark.shuffle.memoryFraction", "0.001")
+    conf.set("spark.shuffle.spill.initialMemoryThreshold", "512")
     conf.set("spark.shuffle.manager", "org.apache.spark.shuffle.sort.SortShuffleManager")
     sc = new SparkContext("local", "test", conf)
 
@@ -152,6 +153,7 @@ class ExternalSorterSuite extends FunSuite with LocalSparkContext with PrivateMe
   test("empty partitions with spilling, bypass merge-sort") {
     val conf = createSparkConf(false)
     conf.set("spark.shuffle.memoryFraction", "0.001")
+    conf.set("spark.shuffle.spill.initialMemoryThreshold", "512")
     conf.set("spark.shuffle.manager", "org.apache.spark.shuffle.sort.SortShuffleManager")
     sc = new SparkContext("local", "test", conf)
 
@@ -761,5 +763,5 @@ class ExternalSorterSuite extends FunSuite with LocalSparkContext with PrivateMe
     }
 
     sorter2.stop()
- }
+  }
 }