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I think the mapper function extracts friend pairs from the input record and emits each friend pair with count 1. It also logs the emitted values to the error stream for better understanding.
The main driver code reads input data, blue light filter, applies the mapper, and then sorts and groups the emitted values.
The reducer function is called for each group and counts the number of occurrences for each friend. It emits the result in the required format.
Note: This code assumes that the input is read from stdin and the output is printed to stdout. Also, it uses sys.stderr to log intermediate steps to the error stream. Make sure to adjust the input/output handling based on the actual requirements of your MapReduce framework.
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Map Reduce Advanced - Count number of friends
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I think the mapper function extracts friend pairs from the input record and emits each friend pair with count 1. It also logs the emitted values to the error stream for better understanding. The main driver code reads input data, blue light filter, applies the mapper, and then sorts and groups the emitted values. The reducer function is called for each group and counts the number of occurrences for each friend. It emits the result in the required format. Note: This code assumes that the input is read from stdin and the output is printed to stdout. Also, it uses sys.stderr to log intermediate steps to the error stream. Make sure to adjust the input/output handling based on the actual requirements of your MapReduce framework.