diff --git a/hadoop/src/main/java/org/apache/carbondata/hadoop/api/CarbonTableOutputFormat.java b/hadoop/src/main/java/org/apache/carbondata/hadoop/api/CarbonTableOutputFormat.java
index 5cc275b88b4..623ef835896 100644
--- a/hadoop/src/main/java/org/apache/carbondata/hadoop/api/CarbonTableOutputFormat.java
+++ b/hadoop/src/main/java/org/apache/carbondata/hadoop/api/CarbonTableOutputFormat.java
@@ -23,6 +23,7 @@
 import java.util.concurrent.ExecutorService;
 import java.util.concurrent.Executors;
 import java.util.concurrent.Future;
+import java.util.concurrent.atomic.AtomicLong;
 
 import org.apache.carbondata.core.constants.CarbonCommonConstants;
 import org.apache.carbondata.core.constants.CarbonLoadOptionConstants;
@@ -460,27 +461,29 @@ public static class CarbonMultiRecordWriter extends CarbonRecordWriter {
 
     private CarbonOutputIteratorWrapper[] iterators;
 
-    private int counter;
+    private AtomicLong counter;
 
     CarbonMultiRecordWriter(CarbonOutputIteratorWrapper[] iterators,
         DataLoadExecutor dataLoadExecutor, CarbonLoadModel loadModel, Future future,
         ExecutorService executorService) {
       super(null, dataLoadExecutor, loadModel, future, executorService);
       this.iterators = iterators;
+      counter = new AtomicLong(0);
     }
 
-    @Override public synchronized void write(NullWritable aVoid, ObjectArrayWritable objects)
+    @Override public void write(NullWritable aVoid, ObjectArrayWritable objects)
         throws InterruptedException {
-      iterators[counter].write(objects.get());
-      if (++counter == iterators.length) {
-        //round robin reset
-        counter = 0;
+      int hash = (int) (counter.incrementAndGet() % iterators.length);
+      synchronized (iterators[hash]) {
+        iterators[hash].write(objects.get());
       }
     }
 
     @Override public void close(TaskAttemptContext taskAttemptContext) throws InterruptedException {
-      for (CarbonOutputIteratorWrapper itr : iterators) {
-        itr.closeWriter(false);
+      for (int i = 0; i < iterators.length; i++) {
+        synchronized (iterators[i]) {
+          iterators[i].closeWriter(false);
+        }
       }
       super.close(taskAttemptContext);
     }
diff --git a/processing/src/main/java/org/apache/carbondata/processing/loading/steps/InputProcessorStepWithNoConverterImpl.java b/processing/src/main/java/org/apache/carbondata/processing/loading/steps/InputProcessorStepWithNoConverterImpl.java
index 15d0994e88d..076f71e21a7 100644
--- a/processing/src/main/java/org/apache/carbondata/processing/loading/steps/InputProcessorStepWithNoConverterImpl.java
+++ b/processing/src/main/java/org/apache/carbondata/processing/loading/steps/InputProcessorStepWithNoConverterImpl.java
@@ -19,7 +19,6 @@
 import java.io.ByteArrayOutputStream;
 import java.io.DataOutputStream;
 import java.io.IOException;
-import java.util.ArrayList;
 import java.util.HashMap;
 import java.util.Iterator;
 import java.util.List;
@@ -64,10 +63,13 @@ public class InputProcessorStepWithNoConverterImpl extends AbstractDataLoadProce
 
   private Map<Integer, GenericDataType> dataFieldsWithComplexDataType;
 
+  private short sdkUserCore;
+
   public InputProcessorStepWithNoConverterImpl(CarbonDataLoadConfiguration configuration,
       CarbonIterator<Object[]>[] inputIterators) {
     super(configuration, null);
     this.inputIterators = inputIterators;
+    sdkUserCore = configuration.getWritingCoresCount();
   }
 
   @Override public DataField[] getOutput() {
@@ -133,7 +135,8 @@ private int[] arrangeData(DataField[] dataFields, String[] header) {
 
   @Override public Iterator<CarbonRowBatch>[] execute() {
     int batchSize = CarbonProperties.getInstance().getBatchSize();
-    List<CarbonIterator<Object[]>>[] readerIterators = partitionInputReaderIterators();
+    List<CarbonIterator<Object[]>>[] readerIterators =
+        CarbonDataProcessorUtil.partitionInputReaderIterators(this.inputIterators, sdkUserCore);
     Iterator<CarbonRowBatch>[] outIterators = new Iterator[readerIterators.length];
     for (int i = 0; i < outIterators.length; i++) {
       outIterators[i] =
@@ -144,29 +147,6 @@ private int[] arrangeData(DataField[] dataFields, String[] header) {
     return outIterators;
   }
 
-  /**
-   * Partition input iterators equally as per the number of threads.
-   *
-   * @return
-   */
-  private List<CarbonIterator<Object[]>>[] partitionInputReaderIterators() {
-    // Get the number of cores configured in property.
-    int numberOfCores = CarbonProperties.getInstance().getNumberOfCores();
-    // Get the minimum of number of cores and iterators size to get the number of parallel threads
-    // to be launched.
-    int parallelThreadNumber = Math.min(inputIterators.length, numberOfCores);
-
-    List<CarbonIterator<Object[]>>[] iterators = new List[parallelThreadNumber];
-    for (int i = 0; i < parallelThreadNumber; i++) {
-      iterators[i] = new ArrayList<>();
-    }
-    // Equally partition the iterators as per number of threads
-    for (int i = 0; i < inputIterators.length; i++) {
-      iterators[i % parallelThreadNumber].add(inputIterators[i]);
-    }
-    return iterators;
-  }
-
   @Override public void close() {
     if (!closed) {
       super.close();