Simply use spark.yarn.executor.memoryOverhead
It is just the max value. The goal is to calculate OVERHEAD as a percentage of real executor memory, as used by RDDs and DataFrames
You should try this also
It controls the executor heap size, but JVMs can also use some memory off heap, for example for interned Strings and direct byte buffers.
The value of the spark.yarn.executor.memory overhead property is added to the executor memory to determine the full memory request to YARN for each executor. It defaults to max(executor memory * 0.10, with a minimum of 384). For more insights on this, Spark Training is advised for the beginners to pursue.
The executors will use a memory allocation based on the property of spark.executor.memoryplus an overhead defined by spark.yarn.executor.memoryOverhead
Hope this answer will help you!
If you want to learn Spark then go through the Spark tutorial: