[Spark Incorrect display in SPARK UI Executor Tab when number of cores is 4 and Active Task display as 5 in Executor Tab of SPARK UI]

Steps:

1. Launch Spark Shell 
2. bin/spark-shell --master yarn  --conf spark.dynamicAllocation.enabled=true --conf spark.dynamicAllocation.initialExecutors=3 --conf spark.dynamicAllocation.minExecutors=1 --conf spark.dynamicAllocation.executorIdleTimeout=60s --conf spark.dynamicAllocation.maxExecutors=5
3. Submit a Job sc.parallelize(1 to 10000,116000).count()
4. Check the YARN UI Executor Tab for the RUNNING application
5. UI display as Number of cores 4 and Active Tasks column shows as 5

Expected:

It Number of Active Tasks should be same as Number of Cores.