getCheckpointFile

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

Get the name of the file to which an RDD is checkpointed

Syntax

file = getCheckpointFile(obj)


Description

file = getCheckpointFile(obj) gets the name of the file to which the RDD obj is checkpointed.

Input Arguments

obj — Input RDD

RDD object

An input RDD, specified as an RDD object.

Output Arguments

file — File name to which an RDD was checkpointed

character vector

The name of the file to which an RDD was checkpointed, returned as a character vector.

Examples

Get Checkpointed File Name

Get the name of the file to which an RDD was checkpointed.

%% 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);

%% getCheckpointFile
sc.setCheckpointDir('myDir')  % set the checkpoint directory
x = sc.parallelize({1,2,3})
y = x.map(@(x)({x,1}));
y.checkpoint()  % tell spark to checkpoint the RDD
y.collect()
% need to call collect, so that spark actually materializes the RDD 
% and checkpoints to the myDir directory
y.getCheckpointFile()

Version History

Introduced in R2016b