The MapReduce job definition is passed to the Start-AzureHDInsightJob PowerShell cmdlet that dispatches the job to your HDInsight ...

The MapReduce job definition is passed to the Start-AzureHDInsightJob PowerShell cmdlet that dispatches the job to your HDInsight cluster. This example uses the Wait-AzureHDInsightJob cmdlet in order to block until job completion, which typically happens in about 30 seconds.