Multi-instance execution

One host activity, one child scope per iteration, outputs aggregated on the enclosing scope

Multi-instance execution One host activity, one child scope per iteration, outputs aggregated on the enclosing scope 01 / Host activity 02 / Iterations (child scopes) EX / Failure Resolve count · collection or N · Host activity Resolve count collection or N Spawn · parallel: all at once · Host activity Spawn parallel: all at once Iteration i · loopCounter + item · Iterations (child scopes) Iteration i loopCounter + item Aggregate · into outputCollection · Host activity Aggregate into outputCollection Host completes · all iterations done · Host activity Host completes all iterations done Host fails · boundary can catch · Failure Host fails boundary can catch per item completes sequential: next throws

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