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https://issues.apache.org/jira/browse/SPARK-26884?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16773286#comment-16773286
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Thincrs commented on SPARK-26884:
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A user of thincrs has selected this issue. Deadline: Wed, Feb 27, 2019 7:01 PM
> 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
> Priority: Minor
> Original Estimate: 48h
> Remaining Estimate: 48h
>
> 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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