@Test
public void test() throws IOException {
File file = new File("target/AvroDocument.avro");
Schema schema = AvroDocument._SCHEMA;
{
System.out.println("Writing to: " + file.getAbsolutePath());
DatumWriter<Object> datumWriter = new SpecificDatumWriter(AvroDocument.class);
FileOutputStream outputStream = new FileOutputStream(file);
DataFileWriter<Object> dfw = new DataFileWriter<Object>(schema, outputStream, datumWriter);
AvroDocument d = createTestDocument();
dfw.append(d);
dfw.flush();
dfw.close();
}
{
System.out.println("Reading from: " + file.getAbsolutePath());
DatumReader<Object> datumReader = new SpecificDatumReader(AvroDocument.class);
SeekableInput seekableInput = new SeekableFileInput(file);
DataFileReader<Object> dfr = new DataFileReader<Object>(seekableInput, datumReader);
AvroDocument d = new AvroDocument();
dfr.next(d);
AvroDocumentReader.dumpAvroDocument(d, System.out);
}
}
private byte[] createAvroData(String name, int age, List<String> emails) throws IOException {
String AVRO_SCHEMA =
"{\n"
+ "\"type\": \"record\",\n"
+ "\"name\": \"Employee\",\n"
+ "\"fields\": [\n"
+ " {\"name\": \"name\", \"type\": \"string\"},\n"
+ " {\"name\": \"age\", \"type\": \"int\"},\n"
+ " {\"name\": \"emails\", \"type\": {\"type\": \"array\", \"items\": \"string\"}},\n"
+ " {\"name\": \"boss\", \"type\": [\"Employee\",\"null\"]}\n"
+ "]}";
Schema schema = new Schema.Parser().parse(AVRO_SCHEMA);
ByteArrayOutputStream out = new ByteArrayOutputStream();
GenericRecord e1 = new GenericData.Record(schema);
e1.put("name", name);
e1.put("age", age);
e1.put("emails", emails);
e1.put("boss", null);
DatumWriter<GenericRecord> datumWriter = new GenericDatumWriter<>(schema);
DataFileWriter<GenericRecord> dataFileWriter = new DataFileWriter<>(datumWriter);
dataFileWriter.create(schema, out);
dataFileWriter.append(e1);
dataFileWriter.close();
return out.toByteArray();
}
@Override
public void cleanup() {
try {
dataFileWriter.close();
} catch (IOException e) {
LOG.error("Error Closing file: " + e);
}
}
private static <T> File createFile(File file, Schema schema, T... records) throws IOException {
DatumWriter<T> datumWriter = new GenericDatumWriter<T>(schema);
DataFileWriter<T> fileWriter = new DataFileWriter<T>(datumWriter);
fileWriter.create(schema, file);
for (T record : records) {
fileWriter.append(record);
}
fileWriter.close();
return file;
}
/**
* Assure that currentWriter is populated and refers to the correct data file. This may
* roll-over the existing data file. Also assures that writing one more span will not violate
* limits on Span storage.
*
* @throws IOException
*/
private void assureCurrentWriter() throws IOException {
boolean createNewFile = false;
// Will we overshoot policy?
while (this.spansSoFar >= maxSpans) {
File oldest = null;
// If spansSoFar is positive, there must be at least one file
synchronized (this.files) {
oldest = this.files.remove(this.files.firstKey());
}
this.spansSoFar -= spansPerFile.get(oldest);
spansPerFile.remove(oldest);
oldest.delete();
}
if (files.size() == 0) {
// In corner case we have removed the current file,
// if that happened we need to clear current variables.
currentTimestamp = (long) 0;
currentWriter = null;
}
long rightNow = System.currentTimeMillis() / 1000L;
// What file should we be in
long cutOff = floorSecond(rightNow);
if (currentWriter == null) {
createNewFile = true;
}
// Test for roll-over.
else if (cutOff >= (currentTimestamp + secondsPerFile)) {
currentWriter.close();
createNewFile = true;
}
if (createNewFile) {
File newFile =
new File(
traceFileDir + "/" + Thread.currentThread().getId() + "_" + cutOff + FILE_SUFFIX);
synchronized (this.files) {
this.files.put(cutOff, newFile);
}
this.spansPerFile.put(newFile, (long) 0);
this.currentWriter = new DataFileWriter<Span>(SPAN_WRITER);
this.currentWriter.setCodec(CodecFactory.deflateCodec(compressionLevel));
this.currentWriter.create(Span.SCHEMA$, newFile);
this.currentTimestamp = cutOff;
}
}
private void populateGenericFile(List<GenericRecord> genericRecords) throws IOException {
FileOutputStream outputStream = new FileOutputStream(this.avroFile);
GenericDatumWriter<GenericRecord> genericDatumWriter =
new GenericDatumWriter<GenericRecord>(schema);
DataFileWriter<GenericRecord> dataFileWriter =
new DataFileWriter<GenericRecord>(genericDatumWriter);
dataFileWriter.create(schema, outputStream);
for (GenericRecord record : genericRecords) {
dataFileWriter.append(record);
}
dataFileWriter.close();
outputStream.close();
}
public void testWrite() throws IOException {
URL url = this.getClass().getClassLoader().getResource("input/Company.avsc");
assertNotNull(url);
Schema schema = new Schema.Parser().parse(new File(url.getFile()));
assertNotNull(schema);
DatumReader<GenericRecord> datumReader = new GenericDatumReader<GenericRecord>(schema);
// Another way of loading a file
File file = new File("src/test/resources/input/companies.avro");
DataFileReader<GenericRecord> dataFileReader =
new DataFileReader<GenericRecord>(file, datumReader);
File fileOut = new File("target/companies2.avro");
Schema schemaOut =
new Schema.Parser().parse(new File("src/test/resources/input/Company2.avsc"));
DatumWriter<GenericRecord> datumWriter = new GenericDatumWriter<GenericRecord>(schemaOut);
DataFileWriter<GenericRecord> dataFileWriter = new DataFileWriter<GenericRecord>(datumWriter);
GenericRecord company = null;
int count = 0;
while (dataFileReader.hasNext()) {
company = dataFileReader.next(company);
if (company.get("name").toString().equals("aol")) {
dataFileWriter.create(schemaOut, fileOut);
GenericRecord recordOut = new GenericData.Record(schemaOut);
recordOut.put("id", company.get("id"));
recordOut.put("name", company.get("name"));
assertTrue(recordOut.getSchema().getField("address") != null);
assertTrue(recordOut.getSchema().getField("employeeCount") == null);
// address is of complex type
GenericRecord address =
new GenericData.Record((GenericData.Record) company.get("address"), true);
recordOut.put("address", address);
dataFileWriter.append(recordOut);
count++;
}
}
assertTrue(count > 0);
dataFileWriter.close();
}
public static void main(String[] args) throws IOException {
User user1 = new User();
user1.setName("Alyssa");
user1.setFavoriteNumber(256);
// Leave favorite color null
// Alternate constructor
User user2 = new User("Ben", 7, "red");
// Construct via builder
User user3 =
User.newBuilder()
.setName("Charlie")
.setFavoriteColor("blue")
.setFavoriteNumber(null)
.build();
// Serialize user1 and user2 to disk
File file = new File("users.avro");
DatumWriter<User> userDatumWriter = new SpecificDatumWriter<User>(User.class);
DataFileWriter<User> dataFileWriter = new DataFileWriter<User>(userDatumWriter);
dataFileWriter.create(user1.getSchema(), file);
dataFileWriter.append(user1);
dataFileWriter.append(user2);
dataFileWriter.append(user3);
dataFileWriter.close();
// Deserialize Users from disk
DatumReader<User> userDatumReader = new SpecificDatumReader<User>(User.class);
DataFileReader<User> dataFileReader = new DataFileReader<User>(file, userDatumReader);
try {
User user = null;
while (dataFileReader.hasNext()) {
// Reuse user object by passing it to next(). This saves us from
// allocating and garbage collecting many objects for files with
// many items.
user = dataFileReader.next(user);
System.out.println(user);
}
} finally {
dataFileReader.close();
}
}
public static void main(String[] args) throws IOException {
DatumWriter<ArchivePlace> datumWriter =
new SpecificDatumWriter<ArchivePlace>(ArchivePlace.class);
DataFileWriter<ArchivePlace> falloutDatafileWriter =
new DataFileWriter<ArchivePlace>(datumWriter);
FileOutputStream falloutOutputStream =
new FileOutputStream("src/test/resources/archive-places/input.avro", true);
falloutDatafileWriter.create(ArchivePlace.SCHEMA$, falloutOutputStream);
List<ArchivePlace> places =
SerializationUtil.loadFromJsons(
ArchivePlace.SCHEMA$, "src/test/resources/archive-places/input.json");
for (ArchivePlace place : places) {
falloutDatafileWriter.append(place);
falloutDatafileWriter.flush();
}
falloutDatafileWriter.close();
falloutOutputStream.close();
}
/** Writes an avro file of generic records with a 'key', 'blah', and 'value' field. */
private Path writeGenericRecordAvroFile() throws IOException {
// Open a writer.
final File file = new File(getLocalTempDir(), "generic-kv.avro");
final Schema writerSchema = Schema.createRecord("record", null, null, false);
writerSchema.setFields(
Lists.newArrayList(
new Schema.Field("key", Schema.create(Schema.Type.INT), null, null),
new Schema.Field("blah", Schema.create(Schema.Type.STRING), null, null),
new Schema.Field("value", Schema.create(Schema.Type.STRING), null, null)));
final DataFileWriter<GenericRecord> fileWriter =
new DataFileWriter<GenericRecord>(new GenericDatumWriter<GenericRecord>(writerSchema))
.create(writerSchema, file);
try {
// Write a record.
GenericData.Record record = new GenericData.Record(writerSchema);
record.put("key", 1);
record.put("blah", "blah");
record.put("value", "one");
fileWriter.append(record);
// Write another record.
record = new GenericData.Record(writerSchema);
record.put("key", 2);
record.put("blah", "blah");
record.put("value", "two");
fileWriter.append(record);
// Write a duplicate record with the same key field value.
record = new GenericData.Record(writerSchema);
record.put("key", 2);
record.put("blah", "blah");
record.put("value", "deux");
fileWriter.append(record);
// Close it and return the path.
} finally {
fileWriter.close();
}
return new Path(file.getPath());
}
private List<Map.Entry> previewAvroBatch(FileStatus fileStatus, int batchSize)
throws IOException, InterruptedException {
SeekableInput input = new FsInput(fileStatus.getPath(), hadoopConf);
DatumReader<GenericRecord> reader = new GenericDatumReader<>();
FileReader<GenericRecord> fileReader = DataFileReader.openReader(input, reader);
List<Map.Entry> batch = new ArrayList<>();
int count = 0;
while (fileReader.hasNext() && batch.size() < batchSize) {
GenericRecord datum = fileReader.next();
ByteArrayOutputStream out = new ByteArrayOutputStream();
DataFileWriter<GenericRecord> dataFileWriter =
new DataFileWriter<GenericRecord>(
new GenericDatumWriter<GenericRecord>(datum.getSchema()));
dataFileWriter.create(datum.getSchema(), out);
dataFileWriter.append(datum);
dataFileWriter.close();
out.close();
batch.add(new Pair(fileStatus.getPath().toUri().getPath() + "::" + count, out.toByteArray()));
count++;
}
return batch;
}
public void serializeSpecific() throws IOException {
// Create a datum to serialize.
MyPair datum = new MyPair();
datum.left = new Utf8("dog");
datum.right = new Utf8("cat");
File tmpFile = File.createTempFile("myPairAvroExample", ".avro");
// Serialize it.
DataFileWriter<MyPair> writer =
new DataFileWriter<MyPair>(new SpecificDatumWriter<MyPair>(MyPair.class));
writer.create(MyPair.SCHEMA$, tmpFile);
writer.append(datum);
writer.close();
System.out.println("Serialization: " + tmpFile);
// Deserialize it.
FileReader<MyPair> reader =
DataFileReader.openReader(tmpFile, new SpecificDatumReader<MyPair>(MyPair.class));
while (reader.hasNext()) {
MyPair result = reader.next();
System.out.printf("Left: %s, Right: %s\n", result.left, result.right);
}
reader.close();
}
@Override
public void close() throws IOException {
dataFileWriter.flush();
dataFileWriter.close();
super.close();
}