采用OpenReplicator解析MySQL binlog

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欢迎跳转到本文的原文链接：https://honeypps.com/backend/read-mysql-binlog-by-using-openreplicator/

Open Replicator是一个用Java编写的MySQL binlog分析程序。Open Replicator 首先连接到MySQL（就像一个普通的MySQL Slave一样），然后接收和分析binlog，最终将分析得出的binlog events以回调的方式通知应用。Open Replicator可以被应用到MySQL数据变化的实时推送，多Master到单Slave的数据同步等多种应用场景。Open Replicator目前只支持MySQL5.0及以上版本。
Open Replicator项目地址：https://github.com/whitesock/open-replicator

binlog事件分析结构图

在阅读下面的内容时，首先需要对binlog有一定的了解，可以 参考《MySQL Binlog解析》。

这里通过open-replicator解析binlog日志事件（binlog-format = row）。binlog日志事件里存在两种操作：DDL和DML，当DDL时输出一条sql，当DML时输出相关行信息。可以参考下面：

DDL（CREATE, ALTER, DROP, TRUNCATE，主要用在定义或改变表的结构）:

{
  "eventId": 1,
  "databaseName": "canal_test",
  "tableName": "`company`",
  "eventType": 2,
  "timestamp": 1477033198000,
  "timestampReceipt": 1477033248780,
  "binlogName": "mysql-bin.000006",
  "position": 353,
  "nextPostion": 468,
  "serverId": 2,
  "before": null,
  "after": null,
  "isDdl": true,
  "sql": "DROP TABLE `company` /* generated by server */"
}

DML(SELECT, UPDATE, INSERT, DELETE，对数据库里的数据进行操作):

{
  "eventId": 0,
  "databaseName": "canal_test",
  "tableName": "person",
  "eventType": 24,
  "timestamp": 1477030734000,
  "timestampReceipt": 1477032161988,
  "binlogName": "mysql-bin.000006",
  "position": 242,
  "nextPostion": 326,
  "serverId": 2,
  "before": {
    "id": "3",
    "sex": "f",
    "address": "shanghai",
    "age": "23",
    "name": "zzh3"
  },
  "after": {
    "id": "3",
    "sex": "m",
    "address": "shanghai",
    "age": "23",
    "name": "zzh3"
  },
  "isDdl": false,
  "sql": null
}

相关的类文件如下：
CDCEvent.java

package or;

import java.util.Map;
import java.util.concurrent.atomic.AtomicLong;

import com.google.code.or.binlog.BinlogEventV4;
import com.google.code.or.binlog.BinlogEventV4Header;
import com.google.code.or.binlog.impl.event.AbstractBinlogEventV4;

public class CDCEvent {
	private long eventId = 0;//事件唯一标识
	private String databaseName = null;
	private String tableName = null;
	private int eventType = 0;//事件类型
	private long timestamp = 0;//事件发生的时间戳[MySQL服务器的时间]
	private long timestampReceipt = 0;//Open-replicator接收到的时间戳[CDC执行的时间戳]
	private String binlogName = null;// binlog file name
	private long position = 0;
	private long nextPostion = 0;
	private long serverId = 0;
	private Map before = null;
	private Map after = null;
	private Boolean isDdl= null;
	private String sql = null;
	
	private static AtomicLong uuid = new AtomicLong(0);
	public CDCEvent(){}
		
	public CDCEvent(final AbstractBinlogEventV4 are, String databaseName, String tableName){
		this.init(are);
		this.databaseName = databaseName;
		this.tableName = tableName;
	}
	
	private void init(final BinlogEventV4 be){
		this.eventId = uuid.getAndAdd(1);
		BinlogEventV4Header header = be.getHeader();
		
		this.timestamp = header.getTimestamp();
		this.eventType = header.getEventType();
		this.serverId = header.getServerId();
		this.timestampReceipt = header.getTimestampOfReceipt();
		this.position = header.getPosition();
		this.nextPostion = header.getNextPosition();
		this.binlogName = header.getBinlogFileName();
	}
	
	@Override
	public String toString(){
		StringBuilder builder = new StringBuilder();
		builder.append("{ eventId:").append(eventId);
		builder.append(",databaseName:").append(databaseName);
		builder.append(",tableName:").append(tableName);
		builder.append(",eventType:").append(eventType);
		builder.append(",timestamp:").append(timestamp);
		builder.append(",timestampReceipt:").append(timestampReceipt);
		builder.append(",binlogName:").append(binlogName);
		builder.append(",position:").append(position);
		builder.append(",nextPostion:").append(nextPostion);
		builder.append(",serverId:").append(serverId);
		builder.append(",isDdl:").append(isDdl);
		builder.append(",sql:").append(sql);
		builder.append(",before:").append(before);
		builder.append(",after:").append(after).append("}");
		
		return builder.toString();
	}
// 省略Getter和Setter方法	
}

open-replicator的解析主要是通过注册Listener的形式实现的，整个过程最重要的步骤在下面：
InstanceListener.java

package or;

import java.util.HashMap;
import java.util.List;
import java.util.Map;

import or.keeper.TableInfoKeeper;
import or.manager.CDCEventManager;
import or.model.ColumnInfo;
import or.model.TableInfo;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import com.google.code.or.binlog.BinlogEventListener;
import com.google.code.or.binlog.BinlogEventV4;
import com.google.code.or.binlog.impl.event.DeleteRowsEvent;
import com.google.code.or.binlog.impl.event.FormatDescriptionEvent;
import com.google.code.or.binlog.impl.event.QueryEvent;
import com.google.code.or.binlog.impl.event.TableMapEvent;
import com.google.code.or.binlog.impl.event.UpdateRowsEvent;
import com.google.code.or.binlog.impl.event.WriteRowsEvent;
import com.google.code.or.binlog.impl.event.XidEvent;
import com.google.code.or.common.glossary.Column;
import com.google.code.or.common.glossary.Pair;
import com.google.code.or.common.glossary.Row;
import com.google.code.or.common.util.MySQLConstants;

public class InstanceListener implements BinlogEventListener{
	private static final Logger logger = LoggerFactory.getLogger(InstanceListener.class);
	
	@Override
	public void onEvents(BinlogEventV4 be) {
		if(be == null){
			logger.error("binlog event is null");
			return;
		}
		
		int eventType = be.getHeader().getEventType();
		switch(eventType){
			case MySQLConstants.FORMAT_DESCRIPTION_EVENT:
			{
				logger.trace("FORMAT_DESCRIPTION_EVENT");
				break;
			}
			case MySQLConstants.TABLE_MAP_EVENT://每次ROW_EVENT前都伴随一个TABLE_MAP_EVENT事件，保存一些表信息，如tableId, tableName, databaseName, 而ROW_EVENT只有tableId
			{
				TableMapEvent tme = (TableMapEvent)be;
				TableInfoKeeper.saveTableIdMap(tme);
				logger.trace("TABLE_MAP_EVENT:tableId:{}",tme.getTableId());
				break;
			}
			case MySQLConstants.DELETE_ROWS_EVENT:
			{
				DeleteRowsEvent dre = (DeleteRowsEvent) be;
				long tableId = dre.getTableId();
				logger.trace("DELETE_ROW_EVENT:tableId:{}",tableId);
				
				TableInfo tableInfo = TableInfoKeeper.getTableInfo(tableId);
				String databaseName = tableInfo.getDatabaseName();
				String tableName = tableInfo.getTableName();
				
				List rows = dre.getRows();
				for(Row row:rows){
					List before = row.getColumns();
					Map beforeMap = getMap(before,databaseName,tableName);
					if(beforeMap !=null && beforeMap.size()>0){
						CDCEvent cdcEvent = new CDCEvent(dre,databaseName,tableName);
						cdcEvent.setIsDdl(false);
						cdcEvent.setSql(null);
						cdcEvent.setBefore(beforeMap);
						CDCEventManager.queue.addLast(cdcEvent);
						logger.info("cdcEvent:{}",cdcEvent);
					}
				}
				break;
			}
			case MySQLConstants.UPDATE_ROWS_EVENT:
			{
				UpdateRowsEvent upe = (UpdateRowsEvent)be;
				long tableId = upe.getTableId();
				logger.info("UPDATE_ROWS_EVENT:tableId:{}",tableId);
				
				TableInfo tableInfo = TableInfoKeeper.getTableInfo(tableId);
				String databaseName = tableInfo.getDatabaseName();
				String tableName = tableInfo.getTableName();
				
				List> rows = upe.getRows();
				for(Pair p:rows){
					List colsBefore = p.getBefore().getColumns();
					List colsAfter = p.getAfter().getColumns();
					
					Map beforeMap = getMap(colsBefore,databaseName,tableName);
					Map afterMap = getMap(colsAfter,databaseName,tableName);
					if(beforeMap!=null && afterMap!=null && beforeMap.size()>0 && afterMap.size()>0){
						CDCEvent cdcEvent = new CDCEvent(upe,databaseName,tableName);
						cdcEvent.setIsDdl(false);
						cdcEvent.setSql(null);
						cdcEvent.setBefore(beforeMap);
						cdcEvent.setAfter(afterMap);
						CDCEventManager.queue.addLast(cdcEvent);
						logger.info("cdcEvent:{}",cdcEvent);
					}
				}
				break;
			}
			case MySQLConstants.WRITE_ROWS_EVENT:
			{
				WriteRowsEvent wre = (WriteRowsEvent)be;
				long tableId = wre.getTableId();
				logger.trace("WRITE_ROWS_EVENT:tableId:{}",tableId);
				
				TableInfo tableInfo = TableInfoKeeper.getTableInfo(tableId);
				String databaseName = tableInfo.getDatabaseName();
				String tableName = tableInfo.getTableName();
				
				List rows = wre.getRows();
				for(Row row: rows){
					List after = row.getColumns();
					Map afterMap = getMap(after,databaseName,tableName);
					if(afterMap!=null && afterMap.size()>0){
						CDCEvent cdcEvent = new CDCEvent(wre,databaseName,tableName);
						cdcEvent.setIsDdl(false);
						cdcEvent.setSql(null);
						cdcEvent.setAfter(afterMap);
						CDCEventManager.queue.addLast(cdcEvent);
						logger.info("cdcEvent:{}",cdcEvent);
					}
				}
				break;
			}
			case MySQLConstants.QUERY_EVENT:
			{
				QueryEvent qe = (QueryEvent)be;
				TableInfo tableInfo = createTableInfo(qe);
				if(tableInfo == null)
					break;
				String databaseName = tableInfo.getDatabaseName();
				String tableName = tableInfo.getTableName();
				logger.trace("QUERY_EVENT:databaseName:{},tableName:{}",databaseName,tableName);
				
				CDCEvent cdcEvent = new CDCEvent(qe,databaseName,tableName);
				cdcEvent.setIsDdl(true);
				cdcEvent.setSql(qe.getSql().toString());
				
				CDCEventManager.queue.addLast(cdcEvent);
				logger.info("cdcEvent:{}",cdcEvent);

				break;
			}
			case MySQLConstants.XID_EVENT:{
				XidEvent xe = (XidEvent)be;
				logger.trace("XID_EVENT: xid:{}",xe.getXid());
				break;
			}
			default:
			{
				logger.trace("DEFAULT:{}",eventType);
				break;
			}
		}
		
	}
	
	/**
	 * ROW_EVENT中是没有Column信息的，需要通过MysqlConnection（下面会讲到）的方式读取列名信息，
	 * 然后跟取回的List进行映射。
	 * 
	 * @param cols
	 * @param databaseName
	 * @param tableName
	 * @return
	 */
	private Map getMap(List cols, String databaseName, String tableName){
		Map map = new HashMap<>();
		if(cols == null || cols.size()==0){
			return null;
		}
		
		String fullName = databaseName+"."+tableName;
		List columnInfoList = TableInfoKeeper.getColumns(fullName);
		if(columnInfoList == null)
			return null;
		if(columnInfoList.size() != cols.size()){
			TableInfoKeeper.refreshColumnsMap();
			if(columnInfoList.size() != cols.size())
			{
				logger.warn("columnInfoList.size is not equal to cols.");
				return null;
			}
		}
		
		for(int i=0;i 1) {
			String[] strs = ss[1].split(" ");
			tName = strs[0];
		} else {
			String[] strs = sql.split(" ");
			boolean start = false;
			for (String s : strs) {
				if (s.indexOf(flag) >= 0) {
					start = true;
					continue;
				}
				if (start && !s.isEmpty()) {
					tName = s;
					break;
				}
			}
		}
		tName.replaceAll("`", "").replaceAll(";", "");
		
		//del "("[create table person(....]
		int index = tName.indexOf('(');
		if(index>0){
			tName = tName.substring(0, index);
		}
		
		return tName;
	}
}

上面所涉及到的TableInfo .java如下：

package or.model;

public class TableInfo {

	private String databaseName;
	private String tableName;
	private String fullName;
	// 省略Getter和Setter
	
	@Override
	public boolean equals(Object o){
		if(this == o)
			return true;
		if(o == null || this.getClass()!=o.getClass())
			return false;
		TableInfo tableInfo = (TableInfo)o;
		if(!this.databaseName.equals(tableInfo.getDatabaseName()))
			return false;
		if(!this.tableName.equals(tableInfo.getTableName()))
			return false;
		if(!this.fullName.equals(tableInfo.getFullName()))
			return false;
		return true;
	}
	
	@Override
	public int hashCode(){
		int result = this.tableName.hashCode();
		result = 31*result+this.databaseName.hashCode();
		result = 31*result+this.fullName.hashCode();
		return result;
	}
}

接着需要有个地方保存从TABLE_MAP_EVENT中提取到的信息，TableInfoKeeper .java

package or.keeper;

import java.util.List;
import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;

import or.MysqlConnection;
import or.model.ColumnInfo;
import or.model.TableInfo;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import com.google.code.or.binlog.impl.event.TableMapEvent;

public class TableInfoKeeper {

	private static final Logger logger = LoggerFactory.getLogger(TableInfoKeeper.class);
	
	private static Map tabledIdMap = new ConcurrentHashMap<>();
	private static Map> columnsMap = new ConcurrentHashMap<>();
	
	static{
		columnsMap = MysqlConnection.getColumns();
	}
	
	public static void saveTableIdMap(TableMapEvent tme){
		long tableId = tme.getTableId();
		tabledIdMap.remove(tableId);
		
		TableInfo table = new TableInfo();
		table.setDatabaseName(tme.getDatabaseName().toString());
		table.setTableName(tme.getTableName().toString());
		table.setFullName(tme.getDatabaseName()+"."+tme.getTableName());
		
		tabledIdMap.put(tableId, table);
	}
	
	public static synchronized void refreshColumnsMap(){
		Map> map = MysqlConnection.getColumns();
		if(map.size()>0){
//			logger.warn("refresh and clear cols.");
			columnsMap = map;
//			logger.warn("refresh and switch cols:{}",map);
		}
		else
		{
			logger.error("refresh columnsMap error.");
		}
	}
	
	public static TableInfo getTableInfo(long tableId){
		return tabledIdMap.get(tableId);
	}
	
	public static List getColumns(String fullName){
		return columnsMap.get(fullName);
	}
}

正如上面InstanceListener中提到的，有些信息需要直接从MySQL中读取，比如数据库表的列信息，相关的类MysqlConnection如下：

package or;

import java.sql.Connection;
import java.sql.DatabaseMetaData;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import or.model.BinlogInfo;
import or.model.BinlogMasterStatus;
import or.model.ColumnInfo;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

public class MysqlConnection {
	private static final Logger logger = LoggerFactory.getLogger(MysqlConnection.class);
	
	private static Connection conn;
	
	private static String host;
	private static int port;
	private static String user;
	private static String password;
	
	public static void setConnection(String hostArg, int portArg, String userArg, String passwordArg){
		try {
			if(conn == null || conn.isClosed()){
				Class.forName("com.mysql.jdbc.Driver");
				
				host = hostArg;
				port = portArg;
				user = userArg;
				password = passwordArg;
				
				conn = DriverManager.getConnection("jdbc:mysql://"+host+":"+port+"/",user,password);
				logger.info("connected to mysql:{} : {}",user,password);
			}
		} catch (ClassNotFoundException e) {
			logger.error(e.getMessage(),e);
		} catch (SQLException e) {
			logger.error(e.getMessage(),e);
		}
	}
	
	public static Connection getConnection(){
		try {
			if(conn == null || conn.isClosed()){
				setConnection(host,port,user,password);
			}
		} catch (SQLException e) {
			logger.error(e.getMessage(),e);
		}
		return conn;
	}

	/**
	 * 获取Column信息
	 * 
	 * @return
	 */
	public static Map> getColumns(){
		Map> cols = new HashMap<>();
		Connection conn = getConnection();
		
		try {
			DatabaseMetaData metaData = conn.getMetaData();
			ResultSet r = metaData.getCatalogs();
			String tableType[] = {"TABLE"};
			while(r.next()){
				String databaseName = r.getString("TABLE_CAT");
				ResultSet result = metaData.getTables(databaseName, null, null, tableType);
				while(result.next()){
					String tableName = result.getString("TABLE_NAME");
//					System.out.println(result.getInt("TABLE_ID"));
					String key = databaseName +"."+tableName;
					ResultSet colSet = metaData.getColumns(databaseName, null, tableName, null);
					cols.put(key, new ArrayList());
					while(colSet.next()){
						ColumnInfo columnInfo = new ColumnInfo(colSet.getString("COLUMN_NAME"),colSet.getString("TYPE_NAME"));
						cols.get(key).add(columnInfo);
					}
					
				}
			}
		} catch (SQLException e) { 
			logger.error(e.getMessage(),e);
		}	
		return cols;
	}
	
	/**
	 * 参考
	 * mysql> show binary logs
	 *  +------------------+-----------+
	 *	| Log_name         | File_size |
	 *	+------------------+-----------+
	 *	| mysql-bin.000001 |       126 |
	 *	| mysql-bin.000002 |       126 |
	 *	| mysql-bin.000003 |      6819 |
	 *	| mysql-bin.000004 |      1868 |
	 *	+------------------+-----------+
	 */
	public static List getBinlogInfo(){
		List binlogList = new ArrayList<>();
		
		Connection conn = null;
		Statement statement = null;
		ResultSet resultSet = null;
		
		try {
			conn = getConnection();
			statement = conn.createStatement();
			resultSet = statement.executeQuery("show binary logs");
			while(resultSet.next()){
				BinlogInfo binlogInfo = new BinlogInfo(resultSet.getString("Log_name"),resultSet.getLong("File_size"));
				binlogList.add(binlogInfo);
			}
		} catch (Exception e) {
			logger.error(e.getMessage(),e);
		} finally{
			try {
				if(resultSet != null)
					resultSet.close();
				if(statement != null)
					statement.close();
				if(conn != null)
					conn.close();
			} catch (SQLException e) {
				logger.error(e.getMessage(),e);
			}
		}
		
		return binlogList;
	}

	/**
	 * 参考：	
	 * mysql> show master status;
	 * 	+------------------+----------+--------------+------------------+
	 * 	| File             | Position | Binlog_Do_DB | Binlog_Ignore_DB |
	 * 	+------------------+----------+--------------+------------------+
	 * 	| mysql-bin.000004 |     1868 |              |                  |
	 * 	+------------------+----------+--------------+------------------+
	 * @return
	 */
	public static BinlogMasterStatus getBinlogMasterStatus(){
		BinlogMasterStatus binlogMasterStatus = new BinlogMasterStatus();
		
		Connection conn = null;
		Statement statement = null;
		ResultSet resultSet = null;
		
		try {
			conn = getConnection();
			statement = conn.createStatement();
			resultSet = statement.executeQuery("show master status");
			while(resultSet.next()){
				binlogMasterStatus.setBinlogName(resultSet.getString("File"));
				binlogMasterStatus.setPosition(resultSet.getLong("Position"));
			}
		} catch (Exception e) {
			logger.error(e.getMessage(),e);
		} finally{
			try {
				if(resultSet != null)
					resultSet.close();
				if(statement != null)
					statement.close();
				if(conn != null)
					conn.close();
			} catch (SQLException e) {
				logger.error(e.getMessage(),e);
			}
		}
		
		return binlogMasterStatus;
	}

	/**
	 * 获取open-replicator所连接的mysql服务器的serverid信息
	 * @return
	 */
	public static int getServerId(){
		int serverId=6789;
		Connection conn = null;
		Statement statement = null;
		ResultSet resultSet = null;
		
		try {
			conn = getConnection();
			statement = conn.createStatement();
			resultSet = statement.executeQuery("show variables like 'server_id'");
			while(resultSet.next()){
				serverId = resultSet.getInt("Value");
			}
		} catch (Exception e) {
			logger.error(e.getMessage(),e);
		} finally{
			try {
				if(resultSet != null)
					resultSet.close();
				if(statement != null)
					statement.close();
				if(conn != null)
					conn.close();
			} catch (SQLException e) {
				logger.error(e.getMessage(),e);
			}
		}
		
		return serverId;
	}
}

上面代码设计的附加类（BinlogInfo.java; BinlogMasterStatus.java; ColumnInfo.java）

package or.model;
public class BinlogInfo {
	private String binlogName;
	private Long fileSize;
	// 省略Getter和Setter
}

package or.model;
public class BinlogMasterStatus {
	private String binlogName;
	private long position;
 // 省略Getter和Setter
}

package or.model;
public class ColumnInfo {
	private String name;
	private String type;
 // 省略Getter和Setter
}

最后还要有个地方存储解析之后的事件信息，这里简要设计下，采用一个ConcurrentLinkedDeque好了（CDCEventManager.java）

package or.manager;
import java.util.concurrent.ConcurrentLinkedDeque;
import or.CDCEvent;
public class CDCEventManager {
	public static final ConcurrentLinkedDeque queue = new ConcurrentLinkedDeque<>();
}

所有的准备工作都完成了，下面可以解析binlog日志了：

package or.test;

import java.util.concurrent.TimeUnit;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import or.CDCEvent;
import or.InstanceListener;
import or.MysqlConnection;
import or.OpenReplicatorPlus;
import or.manager.CDCEventManager;
import or.model.BinlogMasterStatus;

import com.google.code.or.OpenReplicator;
import com.google.gson.Gson;
import com.google.gson.GsonBuilder;
import com.google.gson.JsonElement;
import com.google.gson.JsonParser;

public class OpenReplicatorTest {
	private static final Logger logger = LoggerFactory.getLogger(OpenReplicatorTest.class);
	private static final String host = "xx.xx.xx.60";
	private static final int port = 3306;
	private static final String user = "****";
	private static final String password = "****";
	
	public static void main(String[] args){
		OpenReplicator or = new OpenReplicator ();
		or.setUser(user);
		or.setPassword(password);
		or.setHost(host);
		or.setPort(port);
		MysqlConnection.setConnection(host, port, user, password);
		
//		or.setServerId(MysqlConnection.getServerId());
		//配置里的serverId是open-replicator(作为一个slave)的id,不是master的serverId
		
		BinlogMasterStatus bms = MysqlConnection.getBinlogMasterStatus();
		or.setBinlogFileName(bms.getBinlogName());
//		or.setBinlogFileName("mysql-bin.000004");
		or.setBinlogPosition(4);
		or.setBinlogEventListener(new InstanceListener());
		try {
			or.start();
		} catch (Exception e) {
			logger.error(e.getMessage(),e);
		}
		
		Thread thread = new Thread(new PrintCDCEvent());
		thread.start();
	}

	public static class PrintCDCEvent implements Runnable{
		@Override
		public void run() {
			while(true){
				if(CDCEventManager.queue.isEmpty() == false)
				{
					CDCEvent ce = CDCEventManager.queue.pollFirst();
					Gson gson = new GsonBuilder().setPrettyPrinting().serializeNulls().create();
					String prettyStr1 = gson.toJson(ce);
					System.out.println(prettyStr1);	
				}
				else{
					try {
						TimeUnit.SECONDS.sleep(1);
					} catch (InterruptedException e) {
						e.printStackTrace();
					}
				}
			}
		}		
	}
}

时间运行旧了会遇到这样一个问题：

16-10-21 10:41:49.365 ERROR[binlog-parser-1 AbstractBinlogParser.run:247] failed to parse binlog
java.io.EOFException: null
	at com.google.code.or.io.util.ActiveBufferedInputStream.read(ActiveBufferedInputStream.java:169) ~[open-replicator-1.0.7.jar:na]
	at com.google.code.or.io.impl.XInputStreamImpl.doFill(XInputStreamImpl.java:236) ~[open-replicator-1.0.7.jar:na]
	at com.google.code.or.io.impl.XInputStreamImpl.read(XInputStreamImpl.java:213) ~[open-replicator-1.0.7.jar:na]
	at com.google.code.or.io.impl.XInputStreamImpl.readInt(XInputStreamImpl.java:141) ~[open-replicator-1.0.7.jar:na]
	at com.google.code.or.io.impl.XInputStreamImpl.readInt(XInputStreamImpl.java:61) ~[open-replicator-1.0.7.jar:na]
	at com.google.code.or.binlog.impl.ReplicationBasedBinlogParser.doParse(ReplicationBasedBinlogParser.java:91) ~[open-replicator-1.0.7.jar:na]
	at com.google.code.or.binlog.impl.AbstractBinlogParser$Task.run(AbstractBinlogParser.java:244) ~[open-replicator-1.0.7.jar:na]
	at java.lang.Thread.run(Unknown Source) [na:1.7.0_80]
16-10-21 10:41:49.371 INFO [binlog-parser-1 TransportImpl.disconnect:121] disconnected from xx.xx.xx.60:3306

初步解决方案(extends OpenReplicator然后添加重试机制)：

package or;

import java.util.concurrent.TimeUnit;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import com.google.code.or.OpenReplicator;

public class OpenReplicatorPlus extends OpenReplicator{
	private static final Logger logger = LoggerFactory.getLogger(OpenReplicatorPlus.class);
	private volatile boolean autoRestart = true;
	@Override
	public void stopQuietly(long timeout, TimeUnit unit){
		super.stopQuietly(timeout, unit);
		if(autoRestart){
			try {
				TimeUnit.SECONDS.sleep(10);
				logger.error("Restart OpenReplicator");
			} catch (InterruptedException e) {
				e.printStackTrace();
			}
		}
	}
}

最后只需将OpenReplicatorTest.java中的OpenReplicator or = new OpenReplicator ();改为OpenReplicator or = new OpenReplicatorPlus ();即可。

大功告成~~

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参考资料

1. 谈谈对Canal（增量数据订阅与消费）的理解
2. MySQL主备复制原理、实现及异常处理
3. https://github.com/whitesock/open-replicator

欢迎跳转到本文的原文链接：https://honeypps.com/backend/read-mysql-binlog-by-using-openreplicator/

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