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seaweedfs
SeaweedFS is a fast distributed storage system for blobs, objects, files, and data lake, for billions of files! Blob store has O(1) disk seek, cloud tiering. Filer supports Cloud Drive, cross-DC active-active replication, Kubernetes, POSIX FUSE mount, S3 API, S3 Gateway, Hadoop, WebDAV, encryption, Erasure Coding.
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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.
Both SeaweedFS and JuiceFS support external databases to store metadata . In terms of the supported databases, SeaweedFS supports up to 24 databases. Due to high requirements for database transactions (see below), JuiceFS supports 3 types of transactional databases, 10 in total.