public HdfsSystemDescriptor withReaderType(String readerType) {
    this.consumerReader = Optional.ofNullable(StringUtils.stripToNull(readerType));
    return this;
  }
The type of the file reader for consumer (avro, plain, etc.)
@param readerType reader type for HDFS consumer inputs.
@return this system descriptor
samza-hdfs/src/main/java/org/apache/samza/system/hdfs/descriptors/HdfsSystemDescriptor.java