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debezium
Change data capture for a variety of databases. Please log issues at https://issues.redhat.com/browse/DBZ.
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InfluxDB
Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.
In 'real' large systems you'd typically use change data capture tooling to replicate changes from one system to another. I've personally used Debezium for this. So what is 'fine' is not a question that is simple to answer. At a large scale there's no way getting all the data (or even stuff that is changed) through polling a REST API is going to work well :)
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