Github user foxish commented on the issue:
https://github.com/apache/spark/pull/21366
Yes, watches + polling things is common in controllers. Shared informers
are a good stable abstractions they use so, they can avoid the polling in most
cases. However, for now, If we just use the watch as a trigger to pull all the
data we're interested in and then run our control loop, that's a fine middle
ground.
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