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Mapreduce任务实现邮件监控
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Mapreduce任务实现邮件监控
这里主要使用Java自带邮件类实现Mapreduce任务的监控，如果Mapreduce任务报错则发送报错邮件。Mapreduce的报错信息通过hdfs中的日志获取，里面的报错日志是json格式，这里讲json转换成xml格式发送到邮件。具体代码如下
import java.io.BufferedReader;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.PrintStream;
import java.net.URI;
import java.util.Properties;
import java.util.StringTokenizer;
import javax.mail.Authenticator;
import javax.mail.Message;
import javax.mail.MessagingException;
import javax.mail.PasswordAuthentication;
import javax.mail.Session;
import javax.mail.Transport;
import javax.mail.internet.InternetAddress;
import javax.mail.internet.MimeMessage;
import net.sf.json.JSONArray;
import net.sf.json.JSONObject;
import net.sf.json.xml.XMLSerializer;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.FSDataInputStream;
import org.apache.hadoop.fs.FileStatus;
import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.mapreduce.Job;
public class Email {
private static final String USERNAME = "123456@qq.com";//发送邮件的用户名
private static final String PASSWORD = "123456789";//发送邮件的用户名对应的密码
private static final String EMAIL_HOST = "smtp.qq.com";//邮件服务器host
public static void main(String args[]) {
try {
sendEmail("测试邮件", "测试邮件内容！", "test@qq.com");
System.out.println("email ok !");
} catch (MessagingException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
/**
* @category 发送邮件方法，该方法实现发送Mapreduce任务报错信息，具体的报错信息通过hdfs的报错日志获取
* @param to 目标邮箱(可以多个邮箱，用,号隔开)
* @param job 通过mapreduce的job获取jobID
* @param time 通过时间戳访问错误日志路径
* @throws Exception
*/
public static void sendErrMail(String to, Job job, String time)
throws Exception {
String subject = job.getJobName();
String message = getErr(job, time);
LoginMail lm = new LoginMail(USERNAME, PASSWORD);
// 创建session
Properties props = new Properties();
props.put("mail.smtp.auth", "true");
props.put("mail.smtp.host", EMAIL_HOST);
Session session = Session.getDefaultInstance(props, lm);
// 创建 message
Message msg = new MimeMessage(session);
// 设置发送源地址
msg.setFrom(new InternetAddress(USERNAME));
// 多用户分解
StringTokenizer st = new StringTokenizer(to, ",");
String[] recipients = new String[st.countTokens()];
int rc = 0;
while (st.hasMoreTokens())
recipients[rc++] = st.nextToken();
InternetAddress[] addressTo = new InternetAddress[recipients.length];
for (int i = 0; i < recipients.length; i++) {
addressTo[i] = new InternetAddress(recipients[i]);
}
msg.setRecipients(Message.RecipientType.TO, addressTo);
// 设置邮件主题并发送邮件
msg.setSubject(subject);
msg.setContent(message, "text/html;charset=utf-8");
Transport.send(msg);
}
/**
* @category 自定义主题内容发送，这里的邮件内容不一定是Mapreduce的，可以任意填写
* @param subject 主题
* @param body 内容
* @param to 目标邮箱
* @throws MessagingException
*/
public static void sendEmail(String subject, String body, String to)
throws MessagingException {
LoginMail lm = new LoginMail(USERNAME, PASSWORD);
// 创建session
Properties props = new Properties();
props.put("mail.smtp.auth", "true");
props.put("mail.smtp.host", EMAIL_HOST);
Session session = Session.getDefaultInstance(props, lm);
// 创建 message
Message msg = new MimeMessage(session);
// 设置发送源地址
msg.setFrom(new InternetAddress(USERNAME));
// 多用户分解
StringTokenizer st = new StringTokenizer(to, ",");
String[] recipients = new String[st.countTokens()];
int rc = 0;
while (st.hasMoreTokens())
recipients[rc++] = st.nextToken();
InternetAddress[] addressTo = new InternetAddress[recipients.length];
for (int i = 0; i < recipients.length; i++) {
addressTo[i] = new InternetAddress(recipients[i]);
}
msg.setRecipients(Message.RecipientType.TO, addressTo);
// 设置邮件主题并发送邮件
msg.setSubject(subject);
msg.setContent(body, "text/html;charset=utf-8");
Transport.send(msg);
}
/**
* @category 获取日志文件
* @param job
* @param time
* @return FSDataInputStream
* @throws IOException
*/
public static FSDataInputStream getFile(Job job, String time)
throws IOException {
String year = time.substring(0, 4);
String month = time.substring(4, 6);
String day = time.substring(6, 8);
String dst = "hdfs://192.168.1.100:9000/tmp/hadoop-yarn/staging/history/done/"
+ year + "/" + month + "/" + day + "/000000";
FileSystem fs = FileSystem.get(URI.create(dst), new Configuration());
FileStatus[] status = fs.listStatus(new Path(dst));
FSDataInputStream in = null;
for (int i = 0; i < status.length; i++) {
if (status[i].getPath().getName()
.contains(job.getJobID().toString())
&& status[i].getPath().getName().endsWith("jhist")) {
in = new FSDataInputStream(fs.open(status[i].getPath()));
}
}
return in;
}
/**
* @category 解析文件类容为xml
* @param job
* @param time
* @return xml
* @throws IOException
* @throws InterruptedException
*/
public static String getErr(Job job, String time) throws IOException,
InterruptedException {
FSDataInputStream in = getFile(job, time);
Thread t1 = new Thread();
while (in == null) {
t1.sleep(20000);//由于hdfs每个job的日志不是实时生成，所以需要每隔20秒检查一次hdfs该job日志是否已生成
t1.join();
in = getFile(job, time);
}
BufferedReader br = new BufferedReader(new InputStreamReader(in));
String line = "";
JSONObject jo;
JSONArray jsa = new JSONArray();
String xml = "";
XMLSerializer xmlSerializer = new XMLSerializer();
while ((line = br.readLine()) != null) {
if (line.toUpperCase().indexOf("error".toUpperCase()) > -1) {
jo = JSONObject.fromObject(line);
jsa.add(jo);
}
}
xml = xmlSerializer.write(jsa);
in.close();
br.close();
return xml;
}
/**
* @category 获取try-catch中的异常内容
* @param e Exception
* @return 异常内容
*/
public static String getException(Exception e) {
ByteArrayOutputStream out = new ByteArrayOutputStream();
PrintStream pout = new PrintStream(out);
e.printStackTrace(pout);
String ret = new String(out.toByteArray());
pout.close();
try {
out.close();
} catch (Exception ex) {
}
return ret;
}
}
class LoginMail extends Authenticator {
private String username;
private String password;
public String getUsername() {
return username;
}
public void setUsername(String username) {
this.username = username;
}
public String getPassword() {
return password;
}
public void setPassword(String password) {
this.password = password;
}
@Override
protected PasswordAuthentication getPasswordAuthentication() {
return new PasswordAuthentication(username, password);
}
public LoginMail(String username, String password) {
this.username = username;
this.password = password;
}
}
原文：http://my.oschina.net/mkh/blog/493885
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