What is the simple way to write Parquet Format to HDFS (using Java API) by directly creating Parquet Schema of a Pojo, without using avro and MR?
The samples I found were outdated and uses deprecated methods also uses one of Avro, spark or MR.
Effectively, there is not a lot of sample available for reading/writing Apache parquet files without the help of an external framework.
The core parquet library is parquet-column where you can find some test files reading/writing directly : https://github.com/apache/parquet-mr/blob/master/parquet-column/src/test/java/org/apache/parquet/io/TestColumnIO.java
You then just need to use the same functionality with an HDFS file. You can follow this SOW question for this : Accessing files in HDFS using Java
UPDATED : to respond to the deprecated parts of the API : AvroWriteSupport should be replaced by AvroParquetWriter and I check ParquetWriter it's not deprecated and can be used safely.
Regards,
Loïc
来源：https://stackoverflow.com/questions/39202493/write-parquet-format-to-hdfs-using-java-api-with-out-using-avro-and-mr