Spark Inactivity - Spark Driver stop reading data using TCP streaming after few minutes - apache-spark

Question

I am facing strange issue and tried using Custom Receiver as well.
Issue - Spark Driver/Executor stop receiving and displaying data in stdout after 5 min of Activity. It continuously work if we keep writing data to server socket at the other end.
There is no error reported in driver or executors logs.
Code snippet
SparkConf sparkConf = new SparkConf().setMaster("spark://10.0.0.5:7077").setAppName("SmartAudioAnalytics")
.set("spark.executor.memory", "1g").set("spark.cores.max", "5").set("spark.driver.cores", "2")
.set("spark.driver.memory", "2g");
JavaStreamingContext ssc = new JavaStreamingContext(sparkConf, new Duration(3000));
JavaDStream<String> JsonReq1 = ssc.socketTextStream("myip", 9997, StorageLevels.MEMORY_AND_DISK_SER);
JavaDStream<String> JsonReq2 = ssc.socketTextStream("myIP", 9997, StorageLevels.MEMORY_AND_DISK_SER);
ArrayList<JavaDStream<String>> streamList = new ArrayList<JavaDStream<String>>();
streamList.add(JsonReq1);
JavaDStream<String> UnionStream = ssc.union(JsonReq2, streamList);
UnionStream.foreachRDD(new VoidFunction<JavaRDD<String>>() {
private static final long serialVersionUID = 1L;
int total = 0;
#Override
public void call(JavaRDD<String> rdd) throws Exception {
long count = rdd.count();
total += count;
System.out.println(total);
rdd.foreach(new VoidFunction<String>() {
private static final long serialVersionUID = 1L;
#Override
public void call(String s) throws Exception {
System.out.println(s);
}
});
}
});
System.out.println(UnionStream.count());
ssc.start();
ssc.awaitTermination();
I have opened Spark UI and find all threads are working properly even after 24 hours. Please see pictures