avro2parquet - write Parquet to plain files (i.e., not Hadoop hdfs)

Based on example code snippet ParquetReaderWriterWithAvro.java located on github at:

    MaxNevermind/Hadoop-snippets

Original example code author: Max Konstantinov MaxNevermind

Extensively refactored by: Roger Voss roger-dv, Tideworks Technology, May 2018

IMPLEMENTATION NOTES:

NOTES ON BUILDING AND RUNNING PROGRAM: