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possum
concurrent disk-backed cache supporting efficient direct file I/O, transactions, and snapshots using file cloning and sparse files
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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.
I wrote https://crates.io/crates/possum-db (https://github.com/anacrolix/possum) specifically to take advantage of this feature. APFS was the originally supported FS.
NOTE:
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Hence, a higher number means a more popular project.