THIS IS A TEST INSTANCE. ALL YOUR CHANGES WILL BE LOST!!!!
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For simplicity, we assume the Flink job uses default configuration values for all configurations (e.g. scheduler-mode) except execution.runtime-mode. And the operator reads records from a source which switches from isBacklog=true to isBacklog=false before it reaches EOF.
TODO: we will update the FLIP to clarify what happens when isBacklog switches from false to true.
1) Scheduling strategy
Batch mode:
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