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Posted to issues@spark.apache.org by "Shixiong Zhu (JIRA)" <ji...@apache.org> on 2015/05/18 02:10:59 UTC

[jira] [Created] (SPARK-7693) Remove "import scala.concurrent.ExecutionContext.Implicits.global"

Shixiong Zhu created SPARK-7693:
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             Summary: Remove "import scala.concurrent.ExecutionContext.Implicits.global"
                 Key: SPARK-7693
                 URL: https://issues.apache.org/jira/browse/SPARK-7693
             Project: Spark
          Issue Type: Improvement
          Components: Spark Core
            Reporter: Shixiong Zhu
             Fix For: 1.4.0


Learnt a lesson from SPARK-7655: Spark should avoid to use "scala.concurrent.ExecutionContext.Implicits.global" because the user may submit blocking actions to `scala.concurrent.ExecutionContext.Implicits.global` and exhaust all threads in it. This could crash Spark.

So Spark should always use its own thread pools for safety.



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