Scale and Upgrade

Savepoints, rescaling, max parallelism, operator UIDs, state schema evolution — changing the job without losing the state

A savepoint is a checkpoint you own. GatewayMeter goes from 4 slots to 32 through a savepoint; you meet the max-parallelism ceiling and the missing-uid trap, then evolve the state schema of a running job and upgrade it in place.

Estimated time: 75 minutes

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