diff --git a/src/main/java/org/apache/sysds/runtime/io/FrameReaderTextCSVParallel.java b/src/main/java/org/apache/sysds/runtime/io/FrameReaderTextCSVParallel.java
index 84cd1ca6483..789e8df067a 100644
--- a/src/main/java/org/apache/sysds/runtime/io/FrameReaderTextCSVParallel.java
+++ b/src/main/java/org/apache/sysds/runtime/io/FrameReaderTextCSVParallel.java
@@ -63,7 +63,7 @@ protected void readCSVFrameFromHDFS( Path path, JobConf job, FileSystem fs,
 			splits = IOUtilFunctions.sortInputSplits(splits);
 
 			
-			final ExecutorService pool = CommonThreadPool.get(numThreads);
+		final ExecutorService pool = CommonThreadPool.get(numThreads);
 		try {
 			if(splits.length == 1){
 				new ReadRowsTask(splits[0], informat, job, dest, 0, true).call();
@@ -73,7 +73,7 @@ protected void readCSVFrameFromHDFS( Path path, JobConf job, FileSystem fs,
 			//compute num rows per split
 			ArrayList<Future<Long>> cret = new ArrayList<>();
 			for( int i=0; i<splits.length - 1; i++ ) // all but last split
-				cret.add(pool.submit(new CountRowsTask(splits[i], informat, job, _props.hasHeader() && i==0)));
+				cret.add(pool.submit(new CountRowsTask(splits[i], informat, job, _props.hasHeader() && i==0, i)));
 		
 			//compute row offset per split via cumsum on row counts
 			long offset = 0;
@@ -117,7 +117,7 @@ protected Pair<Integer,Integer> computeCSVSize( Path path, JobConf job, FileSyst
 		try {
 			ArrayList<CountRowsTask> tasks = new ArrayList<>();
 			for( int i=0; i<splits.length; i++ )
-				tasks.add(new CountRowsTask(splits[i], informat, job, _props.hasHeader()&& i==0));
+				tasks.add(new CountRowsTask(splits[i], informat, job, _props.hasHeader()&& i==0, i));
 			List<Future<Long>> cret = pool.invokeAll(tasks);
 			for( Future<Long> count : cret ) 
 				nrow += count.get().longValue();
@@ -140,18 +140,22 @@ private static class CountRowsTask implements Callable<Long> {
 		private TextInputFormat _informat;
 		private JobConf _job;
 		private boolean _hasHeader;
+		private int _id;
 
-		public CountRowsTask(InputSplit split, TextInputFormat informat, JobConf job, boolean hasHeader) {
+
+		public CountRowsTask(InputSplit split, TextInputFormat informat, JobConf job, boolean hasHeader, int id ) {
 			_split = split;
 			_informat = informat;
 			_job = job;
 			_hasHeader = hasHeader;
+			_id = id;
 		}
 
 		@Override
 		public Long call() throws Exception {
+			LOG.debug("lines in split: " + _id + " --- ");
 			long count =  countLinesInSplit(_split, _informat, _job, _hasHeader);
-			LOG.debug("lines in split: " + count);
+			LOG.debug("lines in split: " + _id + " --- " + count);
 			return count;
 		}
 	}