How was the calculation process guaranteed to pass in case of failure — for example, if the electricity went out during the calculation?
sobes.tech AI
Answer from AI
To ensure calculations are completed in case of failure, such as power outages, the following approaches are usually used:
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Transactions and atomicity — operations are performed within transactions that either complete fully or are rolled back, preventing partially completed calculations.
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Periodic state saving (checkpoints) — if the calculation is lengthy, the state is saved to disk or a database so that after a restart, it can continue from the last saved step.
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Use of queues and acknowledgment tasks — calculations are broken into tasks placed in a queue. If a task is not acknowledged as completed, it will be retried.
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Idempotency of operations — to ensure that repeated execution does not lead to errors or incorrect results.
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Uninterruptible Power Supply (UPS) — to minimize sudden outages.
In Java applications, transactional managers (e.g., Spring Transaction), databases supporting ACID, and task management systems (e.g., Quartz, Kafka) are often used for reliable execution and recovery of calculations.