keys

R2026b

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

(To be removed) Return an RDD with the keys of each tuple

matlab.compiler.mlspark.RDD.keys will be removed in a future release. There is no replacement functionality. For more information, see Version History.

Syntax

result = keys(obj)


Description

result = keys(obj) returns an RDD result with the keys of each tuple in obj.

Input Arguments

obj — Input RDD

RDD object

An input RDD, specified as a RDD object.

Output Arguments

result — RDD containing the keys of each tuple in the input RDD

RDD object

A pipelined RDD containing the keys of each tuple in the input RDD, returned as a RDD object.

Examples

Get Keys From a Key-Value RDD

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

%% keys
m = sc.parallelize({ {'AA', {5,15} }, {'BB', 200}});
out = m.keys().collect();

Version History

Introduced in R2016b

R2026b: To be removed

Support for deploying applications using the MATLAB API for Spark™ will be removed in a future release. There is no replacement functionality.