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Production elliptics storage systems host billions of objects in clusters ranging from several servers to hundreds of nodes.
Eblob is a low-level local append-only (configurable) storage system. It combines fast read/write performance with configuration simplicity and rich feature set. Its main goal was to provide bullet-proof low-level backend for Elliptics distributed storage (this is default backend now).
Rift is HTTP frontend to elliptics cluster, it supports S3-like buckets, authentication, bufferend IO, redirect, streaming and many other features
Grape is a realtime pipeline processing engine on top of Elliptics routing. It takes away the whole burden of programming network transport layer (including node autodiscovery, reconnection, connection reset and so on) You can create a signal-slot topology on top of elliptics cluster, where processing nodes are linked to events and can emit one or more events on its own. Elliptics cluster can host as many application topologies as you wish.
HistoryDB is a trully scalable (hundreds of millions updates per day) distributed archive system with per user and per day activity statistics.
React (Real-time call tree) is a library for real-time performance monitoring.