Github user pmackles commented on the issue:
https://github.com/apache/spark/pull/19515
Hi @ArtRand - Based on my testing and interpretation of the code,
```SPARK_DRIVER_MEMORY``` has no affect on MesosClusterDispatcher. Heap size
always winds up being set to ```-Xmx1G``` (the default).
I went with ```SPARK_DAEMON_MEMORY``` because that's what is used for the
Master/Worker in a standalone cluster and I think Dispatcher is pretty similar
in nature to those daemons. That said, I don't have a strong opinion and
```SPARK_DISPATCHER_MEMORY``` works fine for my use case so I am happy to
switch it in the name of getting this PR accepted.
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