Corona is an open-source scheduling framework used on Apache Hadoop based data infrastructure. Corona was initially designed by Facebook to cope up with a large amount of current, incoming data and the queries processed by each data cluster. Corona is considered an advancement or successor to Hadoop MapReduce.
A set-top box is a hardware device that allows a digital signal to be received, decoded and displayed on a television. The signal can be a television signal or Internet data and is received via cable or telephone connection. In the past, set top boxes were mostly used for cable and satellite television. The STB could deliver more channels than a television's own channel numbering system. It received signals containing data for multiple channels and filtered out the channel a user wanted to view. The numerous channels were generally transmitted to an auxiliary channel on the television. Other features included a decoder for pay-per-view and premium channels. Today, most STB systems have two-way communication, allowing for interactive features like adding premium channels directly from the device or incorporating Internet access. A set-top box is also known as set-top unit.
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