package hip.ch3.avro;
import hip.ch3.avro.gen.Stock;
import hip.util.Cli;
import hip.util.CliCommonOpts;
import org.apache.avro.Schema;
import org.apache.avro.file.CodecFactory;
import org.apache.avro.file.DataFileWriter;
import org.apache.avro.generic.GenericData;
import org.apache.avro.generic.GenericDatumWriter;
import org.apache.avro.generic.GenericRecord;
import org.apache.avro.hadoop.io.AvroKeyValue;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.conf.Configured;
import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.io.IOUtils;
import org.apache.hadoop.util.Tool;
import org.apache.hadoop.util.ToolRunner;
import java.io.File;
import java.io.IOException;
import java.io.OutputStream;
public class AvroKeyValueFileWrite extends Configured implements Tool {
/**
* Main entry point for the example.
*
* @param args arguments
* @throws Exception when something goes wrong
*/
public static void main(final String[] args) throws Exception {
int res = ToolRunner.run(new Configuration(), new AvroKeyValueFileWrite(), args);
System.exit(res);
}
/**
* Write the sequence file.
*
* @param args the command-line arguments
* @return the process exit code
* @throws Exception if something goes wrong
*/
public int run(final String[] args) throws Exception {
Cli cli = Cli.builder().setArgs(args).addOptions(CliCommonOpts.IOFileOpts.values()).build();
int result = cli.runCmd();
if (result != 0) {
return result;
}
File inputFile = new File(cli.getArgValueAsString(CliCommonOpts.IOFileOpts.INPUT));
Path outputPath = new Path(cli.getArgValueAsString(CliCommonOpts.IOFileOpts.OUTPUT));
Configuration conf = super.getConf();
FileSystem hdfs = FileSystem.get(conf);
OutputStream os = hdfs.create(outputPath);
writeToAvro(inputFile, os);
return 0;
}
public static Schema SCHEMA = AvroKeyValue.getSchema(
Schema.create(Schema.Type.STRING), Stock.SCHEMA$);
public static void writeToAvro(File inputFile, OutputStream outputStream)
throws IOException {
DataFileWriter<GenericRecord> writer =
new DataFileWriter<GenericRecord>(
new GenericDatumWriter<GenericRecord>());
writer.setCodec(CodecFactory.snappyCodec());
writer.create(SCHEMA, outputStream);
for (Stock stock : AvroStockUtils.fromCsvFile(inputFile)) {
AvroKeyValue<CharSequence, Stock> record
= new AvroKeyValue<CharSequence, Stock>(new GenericData.Record(SCHEMA));
record.setKey(stock.getSymbol());
record.setValue(stock);
writer.append(record.get());
}
IOUtils.closeStream(writer);
IOUtils.closeStream(outputStream);
}
}