What is a container scheduler?

Picture me as a young teenager. After school, we'd go a courtyard and play soccer. That was an exciting sight. A random number of us running around the yard without any orchestration. There was no offense and no defense. We'd just run after a ball. Everyone moves forward towards the ball, someone kicks it to the left, and we move in that direction, only to start running back because someone kicked the ball again. The strategy was simple. Run towards the ball, kick it if you can, wherever you can, repeat. To this day I do not understand how anyone managed to score. It was complete randomness applied to a bunch of kids. There was no strategy, no plan, and no understanding that winning required coordination. Even ...

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