apache/spark — pull request #3454 by srowen (2014-11-25 10:50:07+00:00)
Title: SPARK-1450 [EC2] Specify the default zone in the EC2 script help

This looks like a one-liner, so I took a shot at it. There can be no fixed default availability zone since the names are different per region. But the default behavior can be documented:

```
if opts.zone == "":
opts.zone = random.choice(conn.get_all_zones()).name
```