[FLINK-19807] Add documentation for Flink's "pre-flight phase" and "cluster phase"

• Type: Improvement
• Status: Open
• Priority: Not a Priority
• Resolution: Unresolved
• Component/s: Documentation
• Labels: auto-deprioritized-major auto-deprioritized-minor
• Assignee: Unassigned
• Reporter: Manas Kale
• Created: 26/Oct/20 07:34
• Updated: 10/Nov/21 10:43

Description

A result of this thread.
Basically, care has to be taken when dealing with static variables when running in a minicluster in your IDE v/s running on a cluster.
As such, Flink's "pre-flight phase" and "cluster phase" should be explained on the website along with a warning about this non-obvious behaviour.