how to read a parquet file, in a standalone java code? [closed]

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Closed last year.

the parquet docs from cloudera shows examples of integration with pig/hive/impala. but in many cases I want to read the parquet file itself for debugging purposes.

is there a straightforward java reader api to read a parquet file ?

Thanks Yang

回答1:

You can use AvroParquetReader from parquet-avro library to read a parquet file as a set of AVRO GenericRecord objects.

回答2:

Old method: (deprecated)

AvroParquetReader<GenericRecord> reader = new AvroParquetReader<GenericRecord>(file);
GenericRecord nextRecord = reader.read();

New method:

ParquetReader<GenericRecord> reader = AvroParquetReader.<GenericRecord>builder(file).build();
GenericRecord nextRecord = reader.read();

I got this from here and have used this in my test cases successfully.

来源：https://stackoverflow.com/questions/28615511/how-to-read-a-parquet-file-in-a-standalone-java-code