@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)");
  }
@ 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
called in { @link org . apache . hadoop . mapreduce . InputFormat#getSplits ( org . apache . hadoop . mapreduce . JobContext ) } in the front end