org.apache.spark.examples.mllib

StreamingTestExample

object StreamingTestExample

Perform streaming testing using Welch's 2-sample t-test on a stream of data, where the data stream arrives as text files in a directory. Stops when the two groups are statistically significant (p-value < 0.05) or after a user-specified timeout in number of batches is exceeded.

The rows of the text files must be in the form Boolean, Double. For example: false, -3.92 true, 99.32

Usage: StreamingTestExample <dataDir> <batchDuration> <numBatchesTimeout>

To run on your local machine using the directory dataDir with 5 seconds between each batch and a timeout after 100 insignificant batches, call: $ bin/run-example mllib.StreamingTestExample dataDir 5 100

As you add text files to dataDir the significance test wil continually update every batchDuration seconds until the test becomes significant (p-value < 0.05) or the number of batches processed exceeds numBatchesTimeout.

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