Does the application uses any cached data?

[Rap70r]

Hello,

We need to enable dynamic allocation. One of the spark dynamic allocation configurations is the following:

spark.dynamicAllocation.cachedExecutorIdleTimeout

This has default value: infinity

Does the application uses any type of caching or is it fine if we set the above configuration to 5 minutes for example?
If yes, is it possible to disable caching?
Can the executors be removed safely when idle or does the application depend on already existing executors?

Thank you