final Path file = new Path(new File("target/test/test-camel-bytes").getAbsolutePath());
Configuration conf = new Configuration();
FileSystem fs1 = FileSystem.get(file.toUri(), conf);
SequenceFile.Writer writer = createWriter(fs1, conf, file, NullWritable.class, BytesWritable.class);
NullWritable keyWritable = NullWritable.get();
BytesWritable valueWritable = new BytesWritable();
String value = "CIAO!";
valueWritable.set(value.getBytes(), 0, value.getBytes().length);
writer.append(keyWritable, valueWritable);
writer.sync();