[JIRA] [workflow-plugin] (JENKINS-26034) Add support for sibling-cancel in parallel().

Fri, 12 Dec 2014 09:58:56 -0800

Sorry, I knew I'd get the terminology wrong!

It sounds from JENKINS-26033 that you're leaning towards not having a (meaningful) return value from 'branch'. So if I want to record the fact a particular branch failed, I'd have to swallow the exception and rethrow (to cause the sibling-cancel) – at least, I assume the rethrow would cause the sibling-cancel.

Just thinking out loud about the following use-case: I want to run two tasks in parallel. If either one fails, I want to cancel the other, and then continue executing my job. How would I do that in a world where 'cancel_siblings' was an option to 'parallel'. I guess it would be something like this:

def one_failed, two_failed;
try {
   parallel one: {
      try {
          ...
      } catch (x) {
          _one_failed_ = true
          // Need to rethrow to cause parallel to cancel job two
          rethrow             // I assume this is a thing?
      }
   }, two: {
      try {
          ...
      } catch (x) {
          two_failed = true
          rethrow
      }
   }
} catch (x) {
}

... continue on, looking at one_failed and two_failed if needed ...

It's a little messy but I believe it works. I doubt this is a super-common case, so as long as it's possible I think this design works for our needs, at least.
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