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Big data & Spark

PySpark jobs, partitioning, batch processing, and large-dataset transform patterns.

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How to Simulate a MapReduce Mock with Combine Phase in Python

Simulates a MapReduce pipeline with a combiner that aggregates local counts per reducer to reduce network and compute overhead.

mapreduce combiner hadoop
Python 
from collections import defaultdict

def map_phase(lines):
    intermediate = defaultdict(list)
    for line in lines:
        for word in line.strip().lower().split():
            intermediate[word].append(1)
    return dict(intermediate)

def combine_phase(intermediate, num_reducers=3):
    combined = defaultdict(li…
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