Github user mvj101 commented on the pull request:
https://github.com/apache/spark/pull/2872#issuecomment-67681180
Haven't worked with this in a while and different versions of boto may
alter things, but
1. You might not need to specify a subnet if you have a default VPC
configured. In general I think if you don't specify a subnet boto ignores the
vpc argument. Since VPC/subnet can be tied to different regions it's a good
practice to specify everything as a sanity check.
2. Should be able to to run ./spark-ec2 from any box connected to the
internet - doesn't need to be run within ec2 or within a vpc/subnet.
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