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Merge the values for each key using an associative and commutative reduce function. Code Example
Merge the values for each key using an associative and commutative reduce function. 
from operator import add
rdd = sc.parallelize([("a", 1), ("b", 1), ("a", 1)])
sorted(rdd.reduceByKey(add).collect())
# [('a', 2), ('b', 1)]
Source: spark.apache.org



Python

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Horje