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Posted to issues@spark.apache.org by "Ergin Seyfe (JIRA)" <ji...@apache.org> on 2016/09/09 19:28:20 UTC

[jira] [Created] (SPARK-17480) CompressibleColumnBuilder inefficiently call gatherCompressibilityStats

Ergin Seyfe created SPARK-17480:
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             Summary: CompressibleColumnBuilder inefficiently call gatherCompressibilityStats 
                 Key: SPARK-17480
                 URL: https://issues.apache.org/jira/browse/SPARK-17480
             Project: Spark
          Issue Type: Improvement
          Components: SQL
            Reporter: Ergin Seyfe
            Priority: Minor


When we profile one of our Spark jobs we saw that:

6.24% of the CPU is spend on List.length.
Scala List's length method is O(n) => https://github.com/scala/scala/blob/2.10.x/src/library/scala/collection/LinearSeqOptimized.scala#L36

Since we loop this method becomes O(N^2)



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