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Is There A Way To Enable Low Latency Reads For My Cluster Without Adding Servers Via Read Replicas?

Distributed SQL Tips and Tricks Series
Marko Rajcevic

There are multiple ways to geo-distribute your reads to regions local to your users with YugabyteDB. Read replicas are one of those methods; however, this requires the spinning up for additional infrastructure. Adding servers means paying more money and many companies do not have this flexibility. In such cases, users can enable follower reads to allow for low-latency reads from the primary cluster. As we call out in our follower read documentation:

YugabyteDB requires reading from the leader to read the latest data. However, for applications that do not require the latest data or are working with unchanging data, the cost of contacting a potentially remote leader to fetch the data may be wasteful. Your application may benefit from better latency by reading from a replica that is closer to the client.

Although read replicas are typically used by monolithic applications to accomplish something similar, they use asynchronous replication (in addition to the additional infrastructure). Follower reads execute on the primary cluster. Since data in this cluster replicates synchronously, you can read the right value as soon as the data is written to disk. However, please keep in mind that because data changes are still replicated from the leader, there is a chance of stale reads. Similar to the use of read replicas, this will not work for applications that require absolute correctness of data.

Additional information


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Marko Rajcevic

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