On Thursday, February 26, 2015 at 1:13:00 PM UTC-5, Timothy Wojtaszek wrote:
>
> this means that for a node block, the master executing the workflow is 
> effectively communicating with the slave for each command.
>

Correct, each `sh` step, etc. means a transaction starts over the remoting 
channel to the slave.
 

> the node block simply sets the context such as machine, cwd, etc.
>

Specifically it waits in the queue (just like a top-level job) for an 
available slave; allocates an executor slot when it is scheduled; locks a 
workspace; sets the CWD and relevant environment variables; then runs its 
body with that context.

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