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From "Maxim Gekk (JIRA)" <j...@apache.org>
Subject [jira] [Created] (SPARK-26955) Align Spark's TimSort to JDK 11 TimSort
Date Thu, 21 Feb 2019 13:47:00 GMT
Maxim Gekk created SPARK-26955:
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             Summary: Align Spark's TimSort to JDK 11 TimSort
                 Key: SPARK-26955
                 URL: https://issues.apache.org/jira/browse/SPARK-26955
             Project: Spark
          Issue Type: Improvement
          Components: Spark Core
    Affects Versions: 2.4.0
            Reporter: Maxim Gekk


There are a couple differences in Spark's TimSort and JDK 11 TimSort:
- Additional check in mergeCollapse introduced by http://hg.openjdk.java.net/jdk/jdk/rev/3a6d47df8239#l1.34
- And increased constants for stackLen (http://hg.openjdk.java.net/jdk/jdk11/file/1ddf9a99e4ad/src/java.base/share/classes/java/util/TimSort.java#l184):

The ticket aims to address the differences.



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