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Class: matlab.compiler.mlspark.RDD
Namespace: matlab.compiler.mlspark

Merge the values for each key using an associative reduce function


result = reduceByKey(obj,func,numPartitions)


result = reduceByKey(obj,func,numPartitions) merges the values for each key in obj using an associative reduce function func. numPartitions specifies the number of partitions to create in the resulting RDD.

Input Arguments

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An input RDD, specified as a RDD object.

Associative function to be applied to the elements of the input RDD, specified as a function handle.

Data Types: function_handle

Number of partitions to create, specified as a scalar value.

Data Types: double

Output Arguments

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A pipelined RDD containing values reduced by key, returned as a RDD object.


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%% Connect to Spark
sparkProp = containers.Map({'spark.executor.cores'}, {'1'});
conf = matlab.compiler.mlspark.SparkConf('AppName','myApp', ...
sc = matlab.compiler.mlspark.SparkContext(conf);

%% reduceByKey
inputRDD = sc.parallelize({'A','B','C','A','B'},2);

Version History

Introduced in R2016b