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From "SongYadong (JIRA)" <j...@apache.org>
Subject [jira] [Created] (SPARK-26884) Let task acquire memory accurately when using spilled memory
Date Fri, 15 Feb 2019 06:34:00 GMT
SongYadong created SPARK-26884:
----------------------------------

             Summary: Let task acquire memory accurately when using spilled memory
                 Key: SPARK-26884
                 URL: https://issues.apache.org/jira/browse/SPARK-26884
             Project: Spark
          Issue Type: Improvement
          Components: Spark Core
    Affects Versions: 3.0.0
            Reporter: SongYadong


When task can't get required execution memory, it will call *spill()* of consumers to release
more memory. After spilling, it tries again to acquire memory needed which is *(required
- got)*. That's not accurate as actually *released* memory by spilling may not equal to size
it try to spill. 
So it may be better to acquire memory in more accurate size :
1. when *released* >= needed, acquire needed size. (*required - got*)
2. when *released* < needed, acquire released size.

 



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