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Spark executors temp data or all variables size in program

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Spark executors temp data or all variables size in program

How to get to know the selected spark executors temporary data and all variable size at particular point in program while running ? or spark application temp data/variables size while running ?

for example : reading an object from s3 and loaded into python dataframe . at the time of processing python dataframe . i would like to know the how much temp data has been created and what is the size of all existing variables at perticular point in program