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Hadoop Usage at Last.fm > Generating Charts with Hadoop
Generating Charts with Hadoop
Last.fm uses user-generated track listening data to produce many different types of charts, such as weekly charts for tracks, per country and per user. A number of Hadoop programs are used to process the listening data and generate these charts, and these run on a daily, weekly, or monthly basis. Figure 16-1 shows an example of how this data is displayed on the site; in this case, the weekly top tracks.
Listening data typically arrives at Last.fm from one of two sources:
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A user plays a track of her own (e.g., listening to an MP3 file on a PC or other device), and this information is sent to Last.fm using either the official Last.fm client application or one of many hundreds of third-party applications.
