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我試圖將現有的avro文件轉換爲實木複合地板。但輸出地板文件是空的。我不知道我做錯了什麼......ParquetWriter在java獨立程序中輸出空的地板文件
我的代碼片段:
FileReader<GenericRecord> fileReader = DataFileReader.openReader(
new File("output/users.avro"), new GenericDatumReader<GenericRecord>());
Schema avroSchema = fileReader.getSchema();
// generate the corresponding Parquet schema
MessageType parquetSchema = new AvroSchemaConverter().convert(avroSchema);
// choose compression scheme
CompressionCodecName compressionCodecName = CompressionCodecName.UNCOMPRESSED;
// set Parquet file block size and page size values
int pageSize = 64 * 1024;
Path outputPath = new Path("output/users.parquet");
// create a parquet writer using builder
ParquetWriter parquetWriter = (ParquetWriter) AvroParquetWriter.builder(outputPath)
.withSchema(avroSchema)
.withCompressionCodec(compressionCodecName)
.withPageSize(pageSize)
.build();
// read avro, write parquet
while (fileReader.hasNext()) {
GenericRecord record = fileReader.next();
System.out.println(record);
parquetWriter.write(record);
}