Github user jongyoul commented on the pull request:
https://github.com/apache/spark/pull/4170#issuecomment-71773477
I believed that when we launch mesos driver launchTasks, container run the
command `bin/spark-class` everytime running task. And in my qna email for
mesos, @tnachen answers that one container run multiple command simultaneously.
And my some tests show two tasks runs simutaneously because they write a same
log file at the same time. And my digging codes results no limit to launch task
on a mesos container. However, @mateiz told me that one executor only runs a
single JVM and launch a single task at any time.
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