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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