rabbah commented on issue #4842: Race Condition with Activation Completion Ack 
Back to Controller and Activation Write to Couchdb?
URL: https://github.com/apache/openwhisk/issues/4842#issuecomment-591766005
 
 
   This is by design - it's possible for an activation record to be "lost" in 
that it may not be recorded in the activation store but its results are 
externally observable (either via request/response, a continuation or a 
sequence). This is an area where the semantics and implementation could be 
improved.
   
   The design partly stems from the at most once activation model, and only 
recording the activation metadata once after completion. The active ack is the 
fast pass and is sent ahead of log collection. The activation metadata waits 
for the logs to be drained (which can delay the write back noticeably).

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