ParquetExportMapper.java 文件源码

@Override
protected void setup(Context context) throws IOException, InterruptedException {
  super.setup(context);

  Configuration conf = context.getConfiguration();

  // Instantiate a copy of the user's class to hold and parse the record.
  String recordClassName = conf.get(
      ExportJobBase.SQOOP_EXPORT_TABLE_CLASS_KEY);
  if (null == recordClassName) {
    throw new IOException("Export table class name ("
        + ExportJobBase.SQOOP_EXPORT_TABLE_CLASS_KEY
        + ") is not set!");
  }

  try {
    Class cls = Class.forName(recordClassName, true,
        Thread.currentThread().getContextClassLoader());
    recordImpl = (SqoopRecord) ReflectionUtils.newInstance(cls, conf);
  } catch (ClassNotFoundException cnfe) {
    throw new IOException(cnfe);
  }

  if (null == recordImpl) {
    throw new IOException("Could not instantiate object of type "
        + recordClassName);
  }

  columnTypes = DefaultStringifier.load(conf, AVRO_COLUMN_TYPES_MAP,
      MapWritable.class);
}