Why Replication
Replication means keeping a copy of the same data on multiple machines that are connected via a network. There are several reasons why you might want to replicate data:
- To keep data geographically close to your users (and thus reduce latency)
- To allow the system to continue working even if some of its parts have failed (and thus increase availability)
- To scale out the number of machines that can serve read queries (and thus increase read throughput)
What is Replication
Replication in computing can refer to:
- Data replication, where the same data is stored on multiple storage devices
- Computation replication, where the same computing task is executed many times. Computational tasks may be:
- Replicated in space, where tasks are executed on separate devices
- Replicated in time, where tasks are executed repeatedly on a single device
Replication in space or in time is often linked to scheduling algorithms.
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