[SPARK-23310][CORE] Turn off read ahead input stream for unshafe shuf…

…fle reader To fix regression for TPC-DS queries Author: Sital Kedia <[email protected]> Closes #20492 from sitalkedia/turn_off_async_inputstream. (cherry picked from commit 03b7e12) Signed-off-by: Sameer Agarwal <[email protected]>
apache · Feb 5, 2018 · 173449c · 173449c
1 parent e688ffe
commit 173449c
Showing 1 changed file with 3 additions and 1 deletion.
diff --git a/core/src/main/java/org/apache/spark/util/collection/unsafe/sort/UnsafeSorterSpillReader.java b/core/src/main/java/org/apache/spark/util/collection/unsafe/sort/UnsafeSorterSpillReader.java
@@ -76,8 +76,10 @@ public UnsafeSorterSpillReader(
         SparkEnv.get() == null ? 0.5 :
              SparkEnv.get().conf().getDouble("spark.unsafe.sorter.spill.read.ahead.fraction", 0.5);
 
+    // SPARK-23310: Disable read-ahead input stream, because it is causing lock contention and perf regression for
+    // TPC-DS queries.
     final boolean readAheadEnabled = SparkEnv.get() != null &&
-        SparkEnv.get().conf().getBoolean("spark.unsafe.sorter.spill.read.ahead.enabled", true);
+        SparkEnv.get().conf().getBoolean("spark.unsafe.sorter.spill.read.ahead.enabled", false);
 
     final InputStream bs =
         new NioBufferedFileInputStream(file, (int) bufferSizeBytes);