From 53a57657a7cfadd20b92b2b6c900134ab1abaac9 Mon Sep 17 00:00:00 2001
From: Pete Robbins <robbinspg@gmail.com>
Date: Thu, 2 Jun 2016 10:14:51 -0700
Subject: [PATCH] [SPARK-15606][CORE] Use non-blocking removeExecutor call to
 avoid deadlocks

Set minimum number of dispatcher threads to 3 to avoid deadlocks on machines with only 2 cores

Spark test builds

Author: Pete Robbins <robbinspg@gmail.com>

Closes #13355 from robbinspg/SPARK-13906.

(cherry picked from commit d98fb19c18f0122f335e5d810a2f8ff752b98d86)