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Posted to issues@spark.apache.org by "Li Xian (Jira)" <ji...@apache.org> on 2021/03/24 09:45:00 UTC

[jira] [Created] (SPARK-34855) SparkContext - avoid using local lazy val

Li Xian created SPARK-34855:
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             Summary: SparkContext - avoid using local lazy val
                 Key: SPARK-34855
                 URL: https://issues.apache.org/jira/browse/SPARK-34855
             Project: Spark
          Issue Type: Improvement
          Components: Spark Core
    Affects Versions: 2.4.7
            Reporter: Li Xian
         Attachments: Screen Shot 2021-03-24 at 5.41.22 PM.png

`org.apache.spark.SparkContext#getCallSite` uses local lazy val for `callsite`. But in scala 2.11, local lazy val need synchronization on the containing object `this` (see [https://docs.scala-lang.org/sips/improved-lazy-val-initialization.html#version-6---no-synchronization-on-this-and-concurrent-initialization-of-fields] and [https://github.com/scala/scala-dev/issues/133] )

`getCallSite` is called at the job submission, and thus will be a bottle neck if we are submitting a large amount of jobs on a single spark session. We observed thread blocked due to this in our load test.

!image-2021-03-24-17-42-50-412.png!



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