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Since we have a couple of asynchronous operations (resource timeout in Waiting for resources state, restart delay in restarting) which only work if there hasn’t happened another state change, we need to introduce a state version which can be used to filter out outdated operations.

Automatic scaling

In order to support automatic scaling, we start whenever we enter the Executing state, a ScalingPolicy which checks periodically or whenever new slots arrive whether the system can scale up. If this is the case, then it transitions into the Restarting  state which triggers a global failover and a restart which will make use of the available resources.

Components of the scheduler

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