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• Don't consider (1) since it is covered by (2) and (4)
• Try (2) because it is easy (although not ideal, e.g. because of hardwired number of Reduce calls)
• Try (3) because it is the easiest way to allow legion implementation of mtip (Elliott had already done it for an earlier version of psana).  Note that this is separate from the callback-approach that Seems is supporting.  So callbacks are still necessary.  The need for the two different approaches is not ideal.  With this option the slow epics data from SlowUpdate is difficult.  That will not be supported for now.
• Use (4) as a backup plan if (2) runs into trouble, since (4) is more effort.

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