使用TCP方式拉取Canal数据-编程知识

使用TCP方式拉取Canal数据

1 Canal对接Kafka联调

1.1 配置修改

canal.properties

修改 zk：

canal.zkServers = 10.51.50.219:2181

instance.properties

开启配置项：

canal.mq.dynamicTopic 是 Canal 的 MQ 动态 Topic 配置项：

test_javaedge_01 是kafka 的 topic
test_db.users 要监控的数据库、表
当 test_db.users 表发生变化时，Canal 将会把变化的数据推送到名为 test_javaedge_01:test_db.users 的 MQ Topic 中。

canal.mq.dynamicTopic=test_javaedge_01:test_db\\.users

开启一个消费者

[root@javaedge-kafka-dev bin]# bin/kafka-console-consumer.sh --bootstrap-server localhost:9092 --topic test_javaedge_01

datagrip 新增数据：

消费到该数据：

2 使用TCP方式拉取Canal数据

现在 serverMode 改回tcp。重启

javaedge@JavaEdgedeMac-mini deployer % jps
71002 CanalLauncher
javaedge@JavaEdgedeMac-mini deployer %

canal 同步程序

package com.javaedge.canal;import com.alibaba.fastjson.JSON;
import com.alibaba.otter.canal.client.CanalConnector;
import com.alibaba.otter.canal.client.CanalConnectors;
import com.alibaba.otter.canal.protocol.CanalEntry;
import com.alibaba.otter.canal.protocol.Message;
import com.google.common.base.CaseFormat;import java.net.InetSocketAddress;
import java.util.HashMap;
import java.util.List;public class CanalClientApp {public static void main(String[] args) throws Exception {CanalConnector connector = CanalConnectors.newSingleConnector(new InetSocketAddress("localhost", 11111),"example",null, null);while (true) {connector.connect();connector.subscribe("test_db.users");Message message = connector.get(100);List<CanalEntry.Entry> entries = message.getEntries();if (entries.size()>0) {for (CanalEntry.Entry entry : entries) {String tableName = entry.getHeader().getTableName();CanalEntry.RowChange rowChange = CanalEntry.RowChange.parseFrom(entry.getStoreValue());List<CanalEntry.RowData> rowDatasList = rowChange.getRowDatasList();CanalEntry.EventType eventType = rowChange.getEventType();if (eventType == CanalEntry.EventType.INSERT) {for (CanalEntry.RowData rowData : rowDatasList) {List<CanalEntry.Column> afterColumnsList = rowData.getAfterColumnsList();HashMap<Object, Object> map = new HashMap<>();for (CanalEntry.Column column : afterColumnsList) {String key = CaseFormat.LOWER_UNDERSCORE.to(CaseFormat.LOWER_CAMEL, column.getName());map.put(key, column.getValue());}System.out.println("tableName=" + tableName + "  map=" + JSON.toJSONString(map));}}}}}}
}