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- You might be wondering – how do you do something like a "windowed join", where tuples from one side of the join are joined against the last hour of tuples from the other side of the join.
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Trident tutorial · nathanmarz/storm Wiki
- store the transaction id with the count in the database as an atomic value
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Concepts · nathanmarz/storm Wiki
- transforming a stream of tweets into a stream of trending images requires at least two steps: a bolt to do a rolling count of retweets for each image, and one or more bolts to stream out the top X images (you can do this particular stream transformation in a more scalable way with three bolts than with two).
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Guaranteeing message processing · nathanmarz/storm Wiki
- The second value is a 64 bit number called the "ack val". The ack val is a representation of the state of the entire tuple tree, no matter how big or how small. It is simply the xor of all tuple ids that have been created and/or acked in the tree.
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