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MUSIC and its recipes have all been open sourced in github:MUSIC.
Here is an overview of MUSIC's REST API: https://github.com/att/music/blob/master/RestMusicOverview.pdf
MUSIC and mdbc together can support the following databases: Cassandra, MySQL, MariaDB, H2.
OOF-Homing Optimizer (HAS) uses MUSIC for its state persistence (as a queue) and as a highly available distributed messaging service. This is currently being run in production within ATT's ECOMP.
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