Galaxy

by Parallel Universe

A high-performance in-memory data-grid.

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Helps with: NoSQL DB

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Source Type: Open

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GPL LGPL

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What is it all about?

Galaxy is a high-performance in-memory data-grid (IMDG) that can serve as a basis for building distributed applications that require fine-tuned control over data placement and/or custom distributed data-structures. Galaxy is distributed in-memory data grid that horizontally scales Quasar’s actors across a cluster. Galaxy uses cache-coherence protocols across the network, and ensures that virtually all data queries and transactions are served with no need for IO.

Key Features

* Application code runs on the same cluster nodes (called peer nodes), and processes the data objects, which are kept in RAM. * Galaxy stores data in a fully consistent manner, meaning that if data item B has been modified after a change to data item A, no node in the cluster will see A’s new value but B’s old one. * The data items can optionally be persisted to disk on one or more special nodes called server nodes. * Galaxy can withstand a failure in one or more of the nodes, providing high-availability. This is achieved by either running Galaxy with a server node (which persists all of the grid data to disk) or by running a slave node (or more) for each of the peers, or both. * Galaxy provides a point-to-point messaging service that guarantees message delivery and ordering. A message can be sent to a known node or to the unknown (to the application) owner of a given data item. So if Galaxy’s data-item migration makes moving data to code simple, Galaxy’s messages make moving an operation (code) to data just as simple. * All of Galaxy’s components are monitored to enable full diagnoses of failure or performance problems.