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This demo application is divided in following component
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Client application ( e.g. shopping cart) using App engine
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Data collector using App engine and pubsub
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Demo pipeline using pubsub , dataflow and bigquery
Client application load "https://storage.googleapis.com/staticdemo/sp.min.js" file to send user events to data collector.
Then data collector will publish this data to pubsub topic
then demo pipeline will subscribe that topic and use as stream to transform json event data into bigquery