Is there a "default" scheduler in the Project Reactor? Which one is it? By "default" I mean the one used when no subscribeOn() nor publishOn() are called for the chain.
What is the default scheduler in Project Reactor?
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By default, data production process starts on the Thread that initiated the subscription. Operators that deal with a time (e.g. Mono.delay) will default to running on the Schedulers.parallel() scheduler.
Most of reactive libraries (Reactive Redis, Mongo, ...) would use parallel as a default scheduler.
For example Spring WebFlux, typically use Reactor Netty as a default embedded server and would initiate subscription on Schedulers.parallel().
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