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py-mongo-sync
Oplog-based data sync tool that synchronizes data from a replica set to another deployment, e.g.: standalone, replica set, and sharded cluster.
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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.
And it's about 3.5x faster than the original https://github.com/caosiyang/py-mongo-sync implementation, if you're curious, you can refer to https://github.com/WindSoilder/mongo_sync#benchmark for more details.
NOTE:
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Hence, a higher number means a more popular project.