diff --git a/core/src/main/scala/org/apache/spark/api/python/PythonRDD.scala b/core/src/main/scala/org/apache/spark/api/python/PythonRDD.scala
index 587d5c7dd0fee..ff38e9a2903ff 100644
--- a/core/src/main/scala/org/apache/spark/api/python/PythonRDD.scala
+++ b/core/src/main/scala/org/apache/spark/api/python/PythonRDD.scala
@@ -86,7 +86,7 @@ private[spark] case class ChainedPythonFunctions(funcs: Seq[PythonFunction])
 private[spark] object PythonRunner {
   def apply(func: PythonFunction, bufferSize: Int, reuse_worker: Boolean): PythonRunner = {
     new PythonRunner(
-      Seq(ChainedPythonFunctions(Seq(func))), bufferSize, reuse_worker, false, Seq(Seq(0)))
+      Seq(ChainedPythonFunctions(Seq(func))), bufferSize, reuse_worker, false, Array(Array(0)))
   }
 }
 
@@ -101,7 +101,7 @@ private[spark] class PythonRunner(
     bufferSize: Int,
     reuse_worker: Boolean,
     isUDF: Boolean,
-    argOffsets: Seq[Seq[Int]])
+    argOffsets: Array[Array[Int]])
   extends Logging {
 
   require(funcs.length == argOffsets.length, "numArgs should have the same length as funcs")
diff --git a/python/pyspark/worker.py b/python/pyspark/worker.py
index 849516c8106be..575ec5ba3ffa9 100644
--- a/python/pyspark/worker.py
+++ b/python/pyspark/worker.py
@@ -29,7 +29,7 @@
 from pyspark.broadcast import Broadcast, _broadcastRegistry
 from pyspark.files import SparkFiles
 from pyspark.serializers import write_with_length, write_int, read_long, \
-    write_long, read_int, SpecialLengths, UTF8Deserializer, PickleSerializer, AutoBatchedSerializer
+    write_long, read_int, SpecialLengths, UTF8Deserializer, PickleSerializer, BatchedSerializer
 from pyspark import shuffle
 
 pickleSer = PickleSerializer()
@@ -101,7 +101,7 @@ def read_udfs(pickleSer, infile):
         mapper = eval(mapper_str, udfs)
 
     func = lambda _, it: map(mapper, it)
-    ser = AutoBatchedSerializer(PickleSerializer())
+    ser = BatchedSerializer(PickleSerializer(), 100)
     # profiling is not supported for UDF
     return func, None, ser, ser
 
diff --git a/sql/core/src/main/scala/org/apache/spark/sql/execution/python/BatchPythonEvaluation.scala b/sql/core/src/main/scala/org/apache/spark/sql/execution/python/BatchPythonEvaluation.scala
index 180d2f375d01f..a537ed3bc4199 100644
--- a/sql/core/src/main/scala/org/apache/spark/sql/execution/python/BatchPythonEvaluation.scala
+++ b/sql/core/src/main/scala/org/apache/spark/sql/execution/python/BatchPythonEvaluation.scala
@@ -86,13 +86,13 @@ case class BatchPythonEvaluation(udfs: Seq[PythonUDF], output: Seq[Attribute], c
             dataTypes += e.dataType
             allInputs.length - 1
           }
-        }
-      }
+        }.toArray
+      }.toArray
       val projection = newMutableProjection(allInputs, child.output)()
 
       // Input iterator to Python: input rows are grouped so we send them in batches to Python.
       // For each row, add it to the queue.
-      val inputIterator = iter.grouped(1024).map { inputRows =>
+      val inputIterator = iter.grouped(100).map { inputRows =>
         val toBePickled = inputRows.map { inputRow =>
           queue.add(inputRow)
           val row = projection(inputRow)