[jira] [Created] (FLINK-2452) Add a playcount threshold to the MusicProfiles examples

["Vasia Kalavri (JIRA)" <ji...@apache.org>]

Vasia Kalavri created FLINK-2452:
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             Summary: Add a playcount threshold to the MusicProfiles examples
                 Key: FLINK-2452
                 URL: https://issues.apache.org/jira/browse/FLINK-2452
             Project: Flink
          Issue Type: Improvement
          Components: Gelly
    Affects Versions: 0.10
            Reporter: Vasia Kalavri
            Assignee: Vasia Kalavri
            Priority: Minor


In the MusicProfiles example, when creating the user-user similarity graph, an edge is created between any 2 users that have listened to the same song (even if once). Depending on the input data, this might produce a projection graph with many more edges than the original user-song graph.
To make this computation more efficient, this issue proposes adding a user-defined parameter that filters out songs that a user has listened to only a few times. Essentially, it is a threshold for playcount, above which a user is considered to like a song.

For reference, with a threshold value of 30, the whole Last.fm dataset is analyzed on my laptop in a few minutes, while no threshold results in a runtime of several hours.

There are many solutions to this problem, but since this is just an example (not a library method), I think that keeping it simple is important.

Thanks to [~andralungu] for spotting the inefficiency!



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