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Posted to issues@spark.apache.org by "Thomas Graves (JIRA)" <ji...@apache.org> on 2018/04/11 19:23:00 UTC

[jira] [Created] (SPARK-23964) why does Spillable wait for 32 elements?

Thomas Graves created SPARK-23964:
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             Summary: why does Spillable wait for 32 elements?
                 Key: SPARK-23964
                 URL: https://issues.apache.org/jira/browse/SPARK-23964
             Project: Spark
          Issue Type: Bug
          Components: Spark Core
    Affects Versions: 2.2.1
         Environment: The spillable class has a check:

if (elementsRead % 32 == 0 && currentMemory >= myMemoryThreshold) {

Before it looks to see if it should spill.  

[https://github.com/apache/spark/blob/master/core/src/main/scala/org/apache/spark/util/collection/Spillable.scala#L83]

I'm wondering why it has the elementsRead %32  in it?  If I have a small number of elements that are huge this can easily cause OOM before we actually spill.  

I saw a few conversations on this and one Jira related: https://issues.apache.org/jira/browse/SPARK-4456 . but I've never seen an answer to this.

anyone have history on this?
            Reporter: Thomas Graves






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