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org.apache.pulsar.io.alluxio.sink.AlluxioSink Maven / Gradle / Ivy
/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
*/
package org.apache.pulsar.io.alluxio.sink;
import alluxio.AlluxioURI;
import alluxio.client.WriteType;
import alluxio.client.file.FileOutStream;
import alluxio.client.file.FileSystem;
import alluxio.conf.Configuration;
import alluxio.conf.InstancedConfiguration;
import alluxio.conf.PropertyKey;
import alluxio.exception.AlluxioException;
import alluxio.grpc.CreateFilePOptions;
import alluxio.grpc.WritePType;
import alluxio.util.FileSystemOptionsUtils;
import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.databind.JsonNode;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.google.common.collect.Lists;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.ObjectOutputStream;
import java.nio.charset.StandardCharsets;
import java.util.Arrays;
import java.util.List;
import java.util.Map;
import java.util.UUID;
import lombok.extern.slf4j.Slf4j;
import org.apache.pulsar.client.api.Schema;
import org.apache.pulsar.client.api.schema.GenericObject;
import org.apache.pulsar.client.api.schema.GenericRecord;
import org.apache.pulsar.client.api.schema.KeyValueSchema;
import org.apache.pulsar.common.schema.SchemaType;
import org.apache.pulsar.functions.api.Record;
import org.apache.pulsar.io.core.KeyValue;
import org.apache.pulsar.io.core.Sink;
import org.apache.pulsar.io.core.SinkContext;
import org.apache.pulsar.io.core.annotations.Connector;
import org.apache.pulsar.io.core.annotations.IOType;
/**
* Alluxio sink that treats incoming messages on the input topic as Strings
* and write identical key/value pairs.
*/
@Connector(
name = "alluxio",
type = IOType.SINK,
help = "The sink connector is used for moving records from Pulsar to Alluxio.",
configClass = AlluxioSinkConfig.class)
@Slf4j
public class AlluxioSink implements Sink {
private FileSystem fileSystem;
private FileOutStream fileOutStream;
private long recordsNum;
private String tmpFilePath;
private String fileDirPath;
private String tmpFileDirPath;
private long lastRotationTime;
private long rotationRecordsNum;
private long rotationInterval;
private AlluxioSinkConfig alluxioSinkConfig;
private AlluxioState alluxioState;
private InstancedConfiguration configuration = Configuration.modifiableGlobal();
private ObjectMapper objectMapper = new ObjectMapper();
private List> recordsToAck;
@Override
public void open(Map config, SinkContext sinkContext) throws Exception {
alluxioSinkConfig = AlluxioSinkConfig.load(config);
alluxioSinkConfig.validate();
// initialize FileSystem
String alluxioMasterHost = alluxioSinkConfig.getAlluxioMasterHost();
int alluxioMasterPort = alluxioSinkConfig.getAlluxioMasterPort();
configuration.set(PropertyKey.MASTER_HOSTNAME, alluxioMasterHost);
configuration.set(PropertyKey.MASTER_RPC_PORT, alluxioMasterPort);
if (alluxioSinkConfig.getSecurityLoginUser() != null) {
configuration.set(PropertyKey.SECURITY_LOGIN_USERNAME, alluxioSinkConfig.getSecurityLoginUser());
}
fileSystem = FileSystem.Factory.create(configuration);
// initialize alluxio dirs
String alluxioDir = alluxioSinkConfig.getAlluxioDir();
fileDirPath = alluxioDir.startsWith("/") ? alluxioDir : "/" + alluxioDir;
tmpFileDirPath = fileDirPath + "/tmp";
AlluxioURI alluxioDirPath = new AlluxioURI(fileDirPath);
if (!fileSystem.exists(alluxioDirPath)) {
fileSystem.createDirectory(alluxioDirPath);
}
AlluxioURI tmpAlluxioDirPath = new AlluxioURI(tmpFileDirPath);
if (!fileSystem.exists(tmpAlluxioDirPath)) {
fileSystem.createDirectory(tmpAlluxioDirPath);
}
recordsNum = 0;
recordsToAck = Lists.newArrayList();
tmpFilePath = "";
alluxioState = AlluxioState.WRITE_STARTED;
lastRotationTime = System.currentTimeMillis();
rotationRecordsNum = alluxioSinkConfig.getRotationRecords();
rotationInterval = alluxioSinkConfig.getRotationInterval();
}
@SuppressWarnings("checkstyle:fallthrough")
@Override
public void write(Record record) {
long now = System.currentTimeMillis();
switch (alluxioState) {
case WRITE_STARTED:
try {
writeToAlluxio(record);
if (!shouldRotate(now)) {
break;
}
alluxioState = AlluxioState.FILE_ROTATED;
} catch (AlluxioException | IOException e) {
log.error("Unable to write record to alluxio.", e);
record.fail();
break;
}
case FILE_ROTATED:
try {
closeAndCommitTmpFile();
alluxioState = AlluxioState.FILE_COMMITTED;
ackRecords();
} catch (AlluxioException | IOException e) {
log.error("Unable to flush records to alluxio.", e);
failRecords();
try {
deleteTmpFile();
} catch (AlluxioException | IOException e1) {
log.error("Failed to delete tmp cache file.", e);
}
break;
}
case FILE_COMMITTED:
alluxioState = AlluxioState.WRITE_STARTED;
break;
default:
log.error("{} is not a valid state when writing record to alluxio temp dir {}.",
alluxioState, tmpFileDirPath);
break;
}
}
@Override
public void close() throws Exception {
// flush records in the tmpFile when closing sink
try {
closeAndCommitTmpFile();
ackRecords();
} catch (AlluxioException | IOException e) {
log.error("Unable to flush records to alluxio.", e);
failRecords();
}
deleteTmpFile();
}
private void ackRecords() {
recordsToAck.forEach(Record::ack);
recordsToAck.clear();
}
private void failRecords() {
recordsToAck.forEach(Record::fail);
recordsToAck.clear();
}
private void writeToAlluxio(Record record) throws AlluxioException, IOException {
KeyValue keyValue = extractKeyValue(record);
if (fileOutStream == null) {
createTmpFile();
}
fileOutStream.write(toBytes(keyValue.getValue()));
if (alluxioSinkConfig.getLineSeparator() != '\u0000') {
fileOutStream.write(alluxioSinkConfig.getLineSeparator());
}
recordsNum++;
recordsToAck.add(record);
}
private void createTmpFile() throws AlluxioException, IOException {
CreateFilePOptions.Builder optionsBuilder =
FileSystemOptionsUtils.createFileDefaults(configuration).toBuilder();
UUID id = UUID.randomUUID();
String fileExtension = alluxioSinkConfig.getFileExtension();
tmpFilePath = tmpFileDirPath + "/" + id.toString() + "_tmp" + fileExtension;
if (alluxioSinkConfig.getWriteType() != null) {
WritePType writePType;
try {
writePType = WritePType.valueOf(alluxioSinkConfig.getWriteType().toUpperCase());
} catch (IllegalArgumentException e) {
throw new IllegalArgumentException("Illegal write type when creating Alluxio files, valid values are: "
+ Arrays.asList(WriteType.values()));
}
optionsBuilder.setWriteType(writePType);
}
fileOutStream = fileSystem.createFile(new AlluxioURI(tmpFilePath), optionsBuilder.build());
}
private void closeAndCommitTmpFile() throws AlluxioException, IOException {
// close the tmpFile
if (fileOutStream != null) {
fileOutStream.close();
}
// commit the tmpFile
String filePrefix = alluxioSinkConfig.getFilePrefix();
String fileExtension = alluxioSinkConfig.getFileExtension();
String newFile = filePrefix + "-" + System.currentTimeMillis() + fileExtension;
String newFilePath = fileDirPath + "/" + newFile;
fileSystem.rename(new AlluxioURI(tmpFilePath), new AlluxioURI(newFilePath));
fileOutStream = null;
tmpFilePath = "";
recordsNum = 0;
lastRotationTime = System.currentTimeMillis();
}
private void deleteTmpFile() throws AlluxioException, IOException {
if (!tmpFilePath.equals("")) {
fileSystem.delete(new AlluxioURI(tmpFilePath));
}
}
private boolean shouldRotate(long now) {
boolean rotated = false;
if (recordsNum >= rotationRecordsNum) {
rotated = true;
} else {
if (rotationInterval != -1 && (now - lastRotationTime) >= rotationInterval) {
rotated = true;
}
}
return rotated;
}
private static byte[] toByteArray(Object obj) throws IOException {
byte[] bytes = null;
try (ByteArrayOutputStream baos = new ByteArrayOutputStream();
ObjectOutputStream oos = new ObjectOutputStream(baos)) {
oos.writeObject(obj);
oos.flush();
bytes = baos.toByteArray();
} catch (IOException e) {
log.error("Failed to serialize the object.", e);
throw e;
}
return bytes;
}
private static byte[] toBytes(Object obj) throws IOException {
byte[] bytes;
if (obj instanceof String) {
String s = (String) obj;
bytes = s.getBytes(StandardCharsets.UTF_8);
} else if (obj instanceof byte[]) {
bytes = (byte[]) obj;
} else {
bytes = toByteArray(obj);
}
return bytes;
}
public KeyValue extractKeyValue(Record record) throws JsonProcessingException {
// just ignore the key
if (alluxioSinkConfig.isSchemaEnable()) {
GenericObject recordValue = null;
Schema valueSchema = null;
if (record.getSchema() != null && record.getSchema() instanceof KeyValueSchema) {
KeyValueSchema keyValueSchema = (KeyValueSchema) record.getSchema();
valueSchema = keyValueSchema.getValueSchema();
org.apache.pulsar.common.schema.KeyValue keyValue =
(org.apache.pulsar.common.schema.KeyValue)
record.getValue().getNativeObject();
recordValue = keyValue.getValue();
} else {
valueSchema = record.getSchema();
recordValue = record.getValue();
}
String value = null;
if (recordValue != null) {
if (valueSchema != null) {
value = stringifyValue(valueSchema, recordValue);
} else {
if (recordValue.getNativeObject() instanceof byte[]) {
value = new String((byte[]) recordValue.getNativeObject(), StandardCharsets.UTF_8);
} else {
value = recordValue.getNativeObject().toString();
}
}
}
return new KeyValue<>(null, value);
} else {
return new KeyValue<>(null, new String(record.getMessage()
.orElseThrow(() -> new IllegalArgumentException("Record does not carry message information"))
.getData(), StandardCharsets.UTF_8));
}
}
public String stringifyValue(Schema schema, Object val) throws JsonProcessingException {
// just support json schema
if (schema.getSchemaInfo().getType() == SchemaType.JSON) {
JsonNode jsonNode = (JsonNode) ((GenericRecord) val).getNativeObject();
return objectMapper.writeValueAsString(jsonNode);
}
throw new UnsupportedOperationException("Unsupported value schemaType=" + schema.getSchemaInfo().getType());
}
private enum AlluxioState {
WRITE_STARTED,
FILE_ROTATED,
FILE_COMMITTED
}
}
