I was wondering how to set the replica parameter properly when start a TDengine cluster to balance the storage and high availability? According to documentation of TDengine, default value of replica is 1 which means no copies for each vnode (vGroup size should be 1 as well), and the replica can be dynamically changed to maintain a high avilability of the cluster. However, the extra vnode copies have to be generated physically when starting up multi-replica. So the problem rise up, how should a real company determine the value of replica to increase availability without taking up too much overhead(storage and performance) when using TDengine cluster?
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replica means keeping a copy of the same data on multiple machines that are connected via a network. There are reasons you 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)
referred from DDIA
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