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Many snapshots may be executing within the pipeline in parallel, however, only one snapshot can execute its steps within a single stage at a time.  Multiple snapshots may be within the gates for a single stage.  If a snapshot makes its way through the gates for a stage, any snapshot in the gates created prior is set to out of date.  For example, if three snapshots are executing gates within the DEV stage above, if the latest one makes its way through the gates first, the other two become out of date.  If the snapshot created second makes its way through the gates first, the one created prior is set out of date, but the one created after it is still eligible to continue its way through the gates and on to the steps.  If a snapshot has completed the stage gates, but another snapshot is executing the steps in the same stage, the snapshot completing the gates is held in queue until the executing one completes.


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