murong00 commented on a change in pull request #3823: URL: https://github.com/apache/pulsar/pull/3823#discussion_r690881616
########## File path: pulsar-io/alluxio/src/main/java/org/apache/pulsar/io/alluxio/sink/AlluxioSink.java ########## @@ -0,0 +1,284 @@ +/** + * 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.Configuration; +import alluxio.PropertyKey; +import alluxio.client.WriteType; +import alluxio.client.file.FileOutStream; +import alluxio.client.file.FileSystem; +import alluxio.client.file.options.CreateFileOptions; +import alluxio.exception.AlluxioException; +import com.google.common.collect.Lists; +import lombok.extern.slf4j.Slf4j; +import org.apache.pulsar.client.api.schema.GenericObject; +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; + +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; + +/** + * 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<GenericObject> { + + private FileSystem fileSystem; + private FileOutStream fileOutStream; + private CreateFileOptions createFileOptions; + 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 List<Record<GenericObject>> recordsToAck; + + @Override + public void open(Map<String, Object> 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.get(); + + // 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); + } + + createFileOptions = CreateFileOptions.defaults(); + + recordsNum = 0; + recordsToAck = Lists.newArrayList(); + tmpFilePath = ""; + alluxioState = AlluxioState.WRITE_STARTED; + + lastRotationTime = System.currentTimeMillis(); + rotationRecordsNum = alluxioSinkConfig.getRotationRecords(); + rotationInterval = alluxioSinkConfig.getRotationInterval(); + } + + @Override + public void write(Record<GenericObject> 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<GenericObject> record) throws AlluxioException, IOException { + KeyValue<String, String> 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 { + UUID id = UUID.randomUUID(); + String fileExtension = alluxioSinkConfig.getFileExtension(); + tmpFilePath = tmpFileDirPath + "/" + id.toString() + "_tmp" + fileExtension; + if (alluxioSinkConfig.getWriteType() != null) { + WriteType writeType; + try { + writeType = WriteType.valueOf(alluxioSinkConfig.getWriteType().toUpperCase()); + } catch (IllegalArgumentException e) { + throw new IllegalArgumentException("Illegal write type when creating Alluxio files, valid values are: " + + Arrays.asList(WriteType.values())); + } + createFileOptions.setWriteType(writeType); + } + fileOutStream = fileSystem.createFile(new AlluxioURI(tmpFilePath), createFileOptions); + } + + 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<String, String> extractKeyValue(Record<GenericObject> record) { + String key = record.getKey().orElseGet(() -> String.valueOf(record.getValue())); Review comment: Thanks for pointing this out, I will spend more time to verify this and refine the unit tests. -- This is an automated message from the Apache Git Service. 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