parquet-hadoop/src/main/java/org/apache/parquet/hadoop/api/ReadSupport.java
@Deprecated
  public ReadContext init(
          Configuration configuration,
          Map<String, String> keyValueMetaData,
          MessageType fileSchema) {
    throw new UnsupportedOperationException("Override init(InitContext)");
  }
@Deprecated
  public ReadContext init(
          Configuration configuration,
          Map<String, String> keyValueMetaData,
          MessageType fileSchema) {
    throw new UnsupportedOperationException("Override init(InitContext)");
  }
called in {@link org.apache.hadoop.mapreduce.InputFormat#getSplits(org.apache.hadoop.mapreduce.JobContext)} in the front end

@param configuration    the job configuration
@param keyValueMetaData the app specific metadata from the file
@param fileSchema       the schema of the file
@return the readContext that defines how to read the file

@deprecated override {@link ReadSupport#init(InitContext)} instead