[jira] [Created] (SPARK-9026) SimpleFutureAction.onComplete should not tie up a separate thread for each callback

["Josh Rosen (JIRA)" <ji...@apache.org>]

Josh Rosen created SPARK-9026:
---------------------------------

             Summary: SimpleFutureAction.onComplete should not tie up a separate thread for each callback
                 Key: SPARK-9026
                 URL: https://issues.apache.org/jira/browse/SPARK-9026
             Project: Spark
          Issue Type: Bug
          Components: Spark Core
            Reporter: Josh Rosen


As [~zsxwing] points out at https://github.com/apache/spark/pull/7276#issuecomment-121097747, SimpleFutureAction currently blocks a separate execution context thread for each callback registered via onComplete:

{code}
  override def onComplete[U](func: (Try[T]) => U)(implicit executor: ExecutionContext) {
    executor.execute(new Runnable {
      override def run() {
        func(awaitResult())
      }
    })
  }
{code}

We should fix this so that callbacks do not steal threads.



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