[GitHub] [spark] beliefer opened a new pull request #24671: [MINOR][DOCS]Improve docs about overhead.

[GitBox <gi...@apache.org>]

beliefer opened a new pull request #24671: [MINOR][DOCS]Improve docs about overhead.
URL: https://github.com/apache/spark/pull/24671
 
 
   ## What changes were proposed in this pull request?
   
   I found the docs of `spark.driver.memoryOverhead` and `spark.executor.memoryOverhead` exists a little ambiguity.
   For example, the origin docs of `spark.driver.memoryOverhead` start with `The amount of off-heap memory to be allocated per driver in cluster mode`.
   But `MemoryManager` also managed a memory area named off-heap used to allocate memory in tungsten mode.
   So I think the description of `spark.driver.memoryOverhead` always make confused.
   
   `spark.executor.memoryOverhead` has the same confused with `spark.driver.memoryOverhead`.
   
   ## How was this patch tested?
   
   Exists UT.
   

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