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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.
However, learning to use Apache Beam, which is the open source framework behind Dataflow, is no bed of roses: The official documentation is sparse, GCP-provided templates don't work out-of-the-box, and the Javadoc is, well, a javadoc.
NOTE:
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Hence, a higher number means a more popular project.