Change Stream: The Magic number of watches & oplog insight

Working with Data
#1

Hi All!

Two challenging questions for the experts:

  1. How many instances can I watch() on a single collection at the same time?
    I am planning on building a cluster of “Watchers” on one collection.
    (you can assume I have solved the “Simultaneously” fetching issue)

  2. How can I know how many events are left in the oplog (by given token)?

Thank you all!