[GitHub] SongYadong commented on issue #23794: [SPARK-26884][CORE] Let task acquire memory accurately when using spilled memory

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SongYadong commented on issue #23794: [SPARK-26884][CORE] Let task acquire memory accurately when using spilled memory
URL: https://github.com/apache/spark/pull/23794#issuecomment-464275258
 
 
   Thanks for review. It's right the memory manager will try to give the right amount. But when going to spill action, that is to say memory manager probably can't give needed memory now. If we acquire unsatisfied amount after spilling ( when `released` < `required - got`), memory manager will try redundant effort to get memory, even be blocked temporarily. By accurate control, I think acquiring memory may return fast.

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