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Apache Spark commented on SPARK-34855: -------------------------------------- User 'viirya' has created a pull request for this issue: https://github.com/apache/spark/pull/31988 > SparkContext - avoid using local lazy val > ----------------------------------------- > > Key: SPARK-34855 > URL: https://issues.apache.org/jira/browse/SPARK-34855 > Project: Spark > Issue Type: Bug > Components: Spark Core > Affects Versions: 2.4.7 > Reporter: Li Xian > Priority: Minor > 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! -- This message was sent by Atlassian Jira (v8.3.4#803005) --------------------------------------------------------------------- To unsubscribe, e-mail: issues-unsubscr...@spark.apache.org For additional commands, e-mail: issues-h...@spark.apache.org