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https://issues.apache.org/jira/browse/SPARK-21022?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16043223#comment-16043223
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Shixiong Zhu edited comment on SPARK-21022 at 6/8/17 7:05 PM:
--------------------------------------------------------------
~~Good catch...~~
was (Author: zsxwing):
Good catch...
> RDD.foreach swallows exceptions
> -------------------------------
>
> Key: SPARK-21022
> URL: https://issues.apache.org/jira/browse/SPARK-21022
> Project: Spark
> Issue Type: Bug
> Components: Spark Core
> Affects Versions: 2.1.1
> Reporter: Colin Woodbury
> Assignee: Shixiong Zhu
> Priority: Minor
>
> A `RDD.foreach` or `RDD.foreachPartition` call will swallow Exceptions thrown
> inside its closure, but not if the exception was thrown earlier in the call
> chain. An example:
> {code:none}
> package examples
> import org.apache.spark._
> object Shpark {
> def main(args: Array[String]) {
> implicit val sc: SparkContext = new SparkContext(
> new SparkConf().setMaster("local[*]").setAppName("blahfoobar")
> )
> /* DOESN'T THROW
>
> sc.parallelize(0 until 10000000)
>
> .foreachPartition { _.map { i =>
>
> println("BEFORE THROW")
>
> throw new Exception("Testing exception handling")
>
> println(i)
>
> }}
>
> */
> /* DOESN'T THROW, nor does anything print.
>
> * Commenting out the exception runs the prints.
>
> * (i.e. `foreach` is sufficient to "run" an RDD)
>
> sc.parallelize(0 until 100000)
>
> .foreach({ i =>
>
> println("BEFORE THROW")
>
> throw new Exception("Testing exception handling")
>
> println(i)
>
> })
>
> */
> /* Throws! */
> sc.parallelize(0 until 100000)
> .map({ i =>
> println("BEFORE THROW")
> throw new Exception("Testing exception handling")
> i
> })
> .foreach(i => println(i))
> println("JOB DONE!")
> System.in.read
> sc.stop()
> }
> }
> {code}
> When exceptions are swallowed, the jobs don't seem to fail, and the driver
> exits normally. When one _is_ thrown, as in the last example, the exception
> successfully rises up to the driver and can be caught with try/catch.
> The expected behaviour is for exceptions in `foreach` to throw and crash the
> driver, as they would with `map`.
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