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Posted to issues@spark.apache.org by "SongYadong (JIRA)" <ji...@apache.org> on 2019/02/15 06:34:00 UTC
[jira] [Created] (SPARK-26884) Let task acquire memory accurately
when using spilled memory
SongYadong created SPARK-26884:
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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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