Commits on Jan 10, 2024

1. mango: rolling execution statistics …

   In case of map-reduce views, the arrival of the `complete` message
   is not guaranteed for the view callback (at the shard) when a
   `stop` is issued during the aggregation (at the coordinator).  Due
   to that, internally collected shard-level statistics may not be
   fed back to the coordinator which can cause data loss hence
   inaccuracy in the overall execution statistics.
   
   Address this issue by switching to a "rolling" model where
   row-level statistics are immediately streamed back to the
   coordinator.  Support mixed-version cluster upgrades by activating
   this model only if requested through the map-reduce arguments and
   the given shard supports that.
   
   Fixes apache#4560

   

   pgj committed Jan 10, 2024
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