Define Executor Memory in Spark.
The applications developed in Spark have the same fixed cores count and fixed heap size defined for spark executors. The heap size refers to the memory of the Spark executor that is controlled by making use of the property spark.executor.memory that belongs to the -executor-memory flag. Every Spark applications have one allocated executor on each worker node it runs. The executor memory is a measure of the memory consumed by the worker node that the application utilizes.
