Using an Open Parser MapReduce Job

  1. Create an instance of DataNormalizationFactory, using its static method getInstance().
  2. Provide the input and output details for the Open Parser job by creating an instance of OpenParserDetail specifying the ProcessType. The instance must use the type MRProcessType.
    1. Configure the parsing rules by creating an instance of OpenParserConfiguration. In this instance, set the grammar file path.
    2. Set the details of the Reference Data Path and location type by creating an instance of ReferenceDataPath. See Enum ReferenceDataPathLocation.
    3. Create an instance of OpenParserDetail, by passing an instance of type JobConfig, and the OpenParserConfiguration and ReferenceDataPath instances created earlier as the arguments to its constructor.
      The JobConfig parameter must be an instance of type MRJobConfig.
    4. In the instance of the OpenParserDetail created above, set the details of the input file using the inputPath field of the OpenParserDetail instance.
      • For a text input file, create an instance of FilePath with the relevant details of the input file by invoking the appropriate constructor.
      • For an ORC input file, create an instance of OrcFilePath with the path of the ORC input file as the argument.
      • For a Parquet input file, create an instance of ParquetFilePath with the path of the Parquet input file as the argument.
    5. Set the details of the output file using the outputPath field of the OpenParserDetail instance.
      • For a text output file, create an instance of FilePath with the relevant details of the output file by invoking the appropriate constructor.
      • For an ORC output file, create an instance of OrcFilePath with the path of the ORC output file as the argument.
      • For a Parquet output file, create an instance of ParquetFilePath with the path of the Parquet output file as the argument.
    6. Set the name of the job using the jobName field of the OpenParserDetail instance.
  3. To create a MapReduce job, use the previously created instance of DataNormalizationFactory to invoke its method createJob(). In this, pass the above instance of OpenParserDetail as an argument.
    The createJob() method returns a List of instances of ControlledJob.
  4. Run the created job using an instance of JobControl.