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Fault tolerance is a fundamental principle in distributed systems. As hardware or software components could fail at any time for a variety of reasons, distributed systems have to have solution to handle events such as hard drive failures and server downtime.

Fault tolerance is a fundamental principle in distributed systems. As hardware or software components could fail at any time for a variety of reasons, distributed systems have to have solution to handle events such as hard drive failures and server downtime. For systems deployed across data center regions, engineers must also consider issues related to maintaining high cross-datacenter availability, which is often achieved through geo-replication of data as well as a redundancy strategy (Active-Active, Active-Passive, etc.). It's even more complex to design an effective disaster recovery strat

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