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

["Apache Spark (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/SPARK-7693?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14547406#comment-14547406 ] 

Apache Spark commented on SPARK-7693:
-------------------------------------

User 'zsxwing' has created a pull request for this issue:
https://github.com/apache/spark/pull/6223

> 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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