That task would still run on only the first host, and not the second.
Run_once will only perform the task on the first host... 

On Thursday, December 15, 2016 at 3:58:47 PM UTC+1, Brian Coca wrote:
>
> Then just fail the 'true' host and now you can use run once with 
> confidence only 'false' hosts got there.
>
> - script: myscript
>   register: myreturn
>   failed_when: not myreturn.stdout|bool
>
> - command: othertask
>   run_once: true
>
>
> ----------
> Brian Coca
>

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