Spark hangs after i perform the following operations

ArrayList<byte[]> bytesList = new ArrayList<byte[]>();
/*
   add 40k entries to bytesList
*/

JavaRDD<byte[]> rdd = sparkContext.parallelize(bytesList);
 System.out.println("Count=" + rdd.count());


If i add just one entry it works.

It works if i modify,
JavaRDD<byte[]> rdd = sparkContext.parallelize(bytesList)
to
JavaRDD<byte[]> rdd = sparkContext.parallelize(bytesList, 20);

There is nothing in the logs that can help understand the reason.

What could be reason for this ?


Regards,
Amit Kumar Karmakar

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