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/*
* ============LICENSE_START=======================================================
* ONAP : DATALAKE
* ================================================================================
* Copyright 2019 China Mobile
*=================================================================================
* Licensed 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.
* ============LICENSE_END=========================================================
*/
package org.onap.datalake.feeder.service;
import java.io.IOException;
import java.net.InetAddress;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Date;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import javax.annotation.PostConstruct;
import javax.annotation.PreDestroy;
import org.apache.commons.lang3.tuple.Pair;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.FSDataOutputStream;
import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.fs.Path;
import org.onap.datalake.feeder.config.ApplicationConfiguration;
import org.onap.datalake.feeder.domain.Db;
import org.onap.datalake.feeder.dto.TopicConfig;
import org.onap.datalake.feeder.util.Util;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import lombok.Getter;
import lombok.Setter;
/**
* Service to write data to HDFS
*
* @author Guobiao Mo
*
*/
@Service
public class HdfsService {
private final Logger log = LoggerFactory.getLogger(this.getClass());
@Autowired
ApplicationConfiguration config;
@Autowired
private DbService dbService;
FileSystem fileSystem;
private boolean isReady = false;
private ThreadLocal<Map<String, Buffer>> bufferLocal = ThreadLocal.withInitial(HashMap::new);
private ThreadLocal<SimpleDateFormat> dayFormat = ThreadLocal.withInitial(() -> new SimpleDateFormat("yyyy-MM-dd"));
private ThreadLocal<SimpleDateFormat> timeFormat = ThreadLocal.withInitial(() -> new SimpleDateFormat("yyyy-MM-dd-HH-mm-ss-SSS"));
@Setter
@Getter
private class Buffer {
long lastFlush;
List<String> data;
public Buffer() {
lastFlush = Long.MIN_VALUE;
data = new ArrayList<>();
}
public void flush(String topic) {
try {
if (!data.isEmpty()) {
saveMessages(topic, data);
data.clear();
lastFlush = System.currentTimeMillis();
}
} catch (IOException e) {
log.error("error saving to HDFS." + topic, e);
}
}
public void flushStall(String topic) {
if (!data.isEmpty() && Util.isStall(lastFlush, config.getHdfsFlushInterval())) {
log.debug("going to flushStall topic={}, buffer size={}", topic, data.size());
flush(topic);
}
}
public void addData(List<Pair<Long, String>> messages) {
if (data.isEmpty()) { //reset the last flush time stamp to current if no existing data in buffer
lastFlush = System.currentTimeMillis();
}
messages.stream().forEach(message -> data.add(message.getRight()));//note that message left is not used
}
private void saveMessages(String topic, List<String> bufferList) throws IOException {
long thread = Thread.currentThread().getId();
Date date = new Date();
String day = dayFormat.get().format(date);
String time = timeFormat.get().format(date);
InetAddress inetAddress = InetAddress.getLocalHost();
String hostName = inetAddress.getHostName();
String filePath = String.format("/datalake/%s/%s/%s-%s-%s", topic, day, time, hostName, thread);
Path path = new Path(filePath);
log.debug("writing {} to HDFS {}", bufferList.size(), filePath);
// Create a new file and write data to it.
FSDataOutputStream out = fileSystem.create(path, true, config.getHdfsBufferSize());
bufferList.stream().forEach(message -> {
try {
out.writeUTF(message);
out.write('\n');
} catch (IOException e) {
log.error("error writing to HDFS.", e);
}
});
out.close();
}
}
@PostConstruct
private void init() {
// Initialize HDFS Connection
try {
Db hdfs = dbService.getHdfs();
//Get configuration of Hadoop system
Configuration hdfsConfig = new Configuration();
int port = hdfs.getPort() == null ? 8020 : hdfs.getPort();
String hdfsuri = String.format("hdfs://%s:%s", hdfs.getHost(), port);
hdfsConfig.set("fs.defaultFS", hdfsuri);
System.setProperty("HADOOP_USER_NAME", hdfs.getLogin());
log.info("Connecting to -- {} as {}", hdfsuri, hdfs.getLogin());
fileSystem = FileSystem.get(hdfsConfig);
isReady = true;
} catch (Exception ex) {
log.error("error connection to HDFS.", ex);
isReady = false;
}
}
@PreDestroy
public void cleanUp() {
try {
flush();
fileSystem.close();
} catch (IOException e) {
log.error("fileSystem.close() at cleanUp.", e);
}
}
public void flush() {
bufferLocal.get().forEach((topic, buffer) -> buffer.flush(topic));
}
//if no new data comes in for a topic for a while, need to flush its buffer
public void flushStall() {
bufferLocal.get().forEach((topic, buffer) -> buffer.flushStall(topic));
}
public void saveMessages(TopicConfig topic, List<Pair<Long, String>> messages) {
String topicStr = topic.getName();
Map<String, Buffer> bufferMap = bufferLocal.get();
final Buffer buffer = bufferMap.computeIfAbsent(topicStr, k -> new Buffer());
buffer.addData(messages);
if (!config.isAsync() || buffer.getData().size() >= config.getHdfsBatchSize()) {
buffer.flush(topicStr);
} else {
log.debug("buffer size too small to flush: bufferData.size() {} < config.getHdfsBatchSize() {}", buffer.getData().size(), config.getHdfsBatchSize());
}
}
}
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