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University 2020 Composite subscription pattern language A(X>0) & (B(Y=10);[timespan:5] C(Z<5))[within:15] A, B, C are topics X, Y, Z are inner fields The rule fires when an item of type A having an an attribute X > 0 enters the system and also an item of type B with Y = 10 is detected, followed (in a time interval of 5–15 s) by an item of type C with Z < 5. 8 Vasiliki Kalavri | Boston University BY CustomerId AS PATTERN (X Y Z) WHERE X.Event = ‘order’ AND Y.Event = ‘rebate’ AND Y.ItemID = X.ItemID AND Z.Event = ‘cancel’ AND Z.ItemID = Y.ItemID Partitions the stream into

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Create conda virtual environment under a directory, e.g. venv conda create --name venv python=3.8 -y The conda virtual environment needs to be activated before to use it. To activate the conda virtual currently only supports Python 3.6, 3.7 and 3.8 in PyFlink officially. RUN apt-get update -y && \ apt-get install -y build-essential libssl-dev zlib1g-dev libbz2-dev libffi-dev && \ wget https://www.python

Create conda virtual environment under a directory, e.g. venv conda create --name venv python=3.8 -y The conda virtual environment needs to be activated before to use it. To activate the conda virtual currently only supports Python 3.6, 3.7 and 3.8 in PyFlink officially. RUN apt-get update -y && \ apt-get install -y build-essential libssl-dev zlib1g-dev libbz2-dev libffi-dev && \ wget https://www.python

δ*N, where N is the number of stream elements • The solution will not contain any item y with frequency: • freq(y) < (δ - ε)*N, for a user-chosen value ε
 4 (δ - ε)*Ν δ*Ν not included may be included

then: X*.add({x, f}) // remove unpopular elements from the heap for (y, fy) in X* do: if fy <= f* then X*.remove({y, fy}) return X* Computing top-k ??? Vasiliki Kalavri | Boston University

StreamExecutionEnvironment .disableOperatorChaining() val input: DataStream[X] = ... val result: DataStream[Y] = input .filter(new Filter1()) .map(new Map1()) // disable chaining for Map2 .map(new Map2()).disableChaining()