canal快速开始

java
canal, java

服务端

服务端ip：192.168.1.101

  1. 下载canal 到/opt/softwares

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    wget https://github.com/alibaba/canal/releases/download/canal-1.0.26-preview-2/canal.deployer-1.0.26-SNAPSHOT.tar.gz

  1. 解压缩

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    mkdir /opt/canal && tar -zxvf canal.deployer-1.0.26-SNAPSHOT.tar.gz -C /opt/canal/

  2. 配置mysql

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    vim /etc/my.cnf

    [mysqld]
    log-bin=mysql-bin
    binlog-format=ROW
    server_id=1

  3. 创建用户

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    CREATE USER canal IDENTIFIED BY 'canal';
    GRANT SELECT, REPLICATION SLAVE, REPLICATION CLIENT ON *.* TO 'canal'@'%';
    -- GRANT ALL PRIVILEGES ON *.* TO 'canal'@'%';
    FLUSH PRIVILEGES;

  4. 创建数据库

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    CREATE DATABASE IF NOT EXISTS canal_tsdb default charset utf8 COLLATE utf8_general_ci;

  5. 配置canal

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    cp /opt/canal/conf/example/instance.properties /opt/canal/conf/example/instance.properties.bak
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    vim /opt/canal/conf/example/instance.properties

    #################################################
    ## mysql serverId
    canal.instance.mysql.slaveId=0
    # position info
    canal.instance.master.address=127.0.0.1:3306
    canal.instance.master.journal.name=mysql-bin.000001
    canal.instance.master.position=12172
    canal.instance.master.timestamp=


    # table meta tsdb info
    canal.instance.tsdb.enable=true
    #canal.instance.tsdb.dir=${canal.file.data.dir:../conf}/${canal.instance.destination:}
    #canal.instance.tsdb.url=jdbc:h2:${canal.instance.tsdb.dir}/h2;CACHE_SIZE=1000;MODE=MYSQL;
    canal.instance.tsdb.url=jdbc:mysql://127.0.0.1:3306/canal_tsdb
    canal.instance.tsdb.dbUsername=canal
    canal.instance.tsdb.dbPassword=canal


    #canal.instance.standby.address =
    #canal.instance.standby.journal.name =
    #canal.instance.standby.position = 
    #canal.instance.standby.timestamp = 
    # username/password
    canal.instance.dbUsername=canal
    canal.instance.dbPassword=canal
    canal.instance.defaultDatabaseName=test
    canal.instance.connectionCharset=UTF-8
    # table regex
    canal.instance.filter.regex=.*\\..*
    # table black regex
    canal.instance.filter.black.regex=
    #################################################

    修改canal.properties

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    vim /opt/canal/conf/canal.properties

    #canal.instance.tsdb.spring.xml=classpath:spring/tsdb/h2-tsdb.xml
    canal.instance.tsdb.spring.xml=classpath:spring/tsdb/mysql-tsdb.xml

    # 找到tsdb的配置，注释上面的配置，启用下面的配置

    ​

  6. 启动canal

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    sh /opt/canal/bin/startup.sh

客户端

  1. 引入依赖

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    <dependency>
    	<groupId>com.alibaba.otter</groupId>
    	<artifactId>canal.client</artifactId>
    	<version>1.0.23</version>
    </dependency>

  2. 客户端启动类

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    package canal.test;

    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 java.net.InetSocketAddress;
    import java.util.List;

    /**
     * @author tt
     */
    public class SimpleCanalClientExample {

        public static void main(String[] args) {
            // 创建链接
            CanalConnector connector = CanalConnectors.newSingleConnector(new InetSocketAddress("192.168.1.101",
                    11111), "example", "", "");
            int batchSize = 1000;
            int emptyCount = 0;
            try {
                connector.connect();
                connector.subscribe(".*\\..*");
                connector.rollback();
                int totalEmptyCount = 120;
                boolean flag = true;
                while (flag || emptyCount < totalEmptyCount) {
                    Message message = connector.getWithoutAck(batchSize); // 获取指定数量的数据
                    long batchId = message.getId();
                    int size = message.getEntries().size();
                    if (batchId == -1 || size == 0) {
                        emptyCount++;
                        System.out.println("empty count : " + emptyCount);
                        try {
                            Thread.sleep(1000);
                        } catch (InterruptedException e) {
                        }
                    } else {
                        emptyCount = 0;
                        // System.out.printf("message[batchId=%s,size=%s] \n", batchId, size);
                        printEntry(message.getEntries());
                    }

                    connector.ack(batchId); // 提交确认
                    // connector.rollback(batchId); // 处理失败, 回滚数据
                }

                System.out.println("empty too many times, exit");
            } finally {
                connector.disconnect();
            }
        }

        private static void printEntry(List<CanalEntry.Entry> entrys) {
            for (CanalEntry.Entry entry : entrys) {
                if (entry.getEntryType() == CanalEntry.EntryType.TRANSACTIONBEGIN || entry.getEntryType() == CanalEntry.EntryType.TRANSACTIONEND) {
                    continue;
                }

                CanalEntry.RowChange rowChage = null;
                try {
                    rowChage = CanalEntry.RowChange.parseFrom(entry.getStoreValue());
                } catch (Exception e) {
                    throw new RuntimeException("ERROR ## parser of eromanga-event has an error , data:" + entry.toString(),
                            e);
                }

                CanalEntry.EventType eventType = rowChage.getEventType();
                System.out.println(String.format("================> binlog[%s:%s] , name[%s,%s] , eventType : %s",
                        entry.getHeader().getLogfileName(), entry.getHeader().getLogfileOffset(),
                        entry.getHeader().getSchemaName(), entry.getHeader().getTableName(),
                        eventType));

                for (CanalEntry.RowData rowData : rowChage.getRowDatasList()) {
                    if (eventType == CanalEntry.EventType.DELETE) {
                        printColumn(rowData.getBeforeColumnsList());
                    } else if (eventType == CanalEntry.EventType.INSERT) {
                        printColumn(rowData.getAfterColumnsList());
                    } else {
                        System.out.println("-------> before");
                        printColumn(rowData.getBeforeColumnsList());
                        System.out.println("-------> after");
                        printColumn(rowData.getAfterColumnsList());
                    }
                }
            }
        }

        private static void printColumn(List<CanalEntry.Column> columns) {
            for (CanalEntry.Column column : columns) {
                System.out.println(column.getName() + " : " + column.getValue() + "    update=" + column.getUpdated());
            }
        }

    }

快速开始到这里就结束了。

本文由 xxzkid | 我叫王也道长创作，采用 CC BY 3.0 CN协议 进行许可。 可自由转载、引用，但需署名作者且注明文章出处。
本文标题：canal快速开始
本文链接：https://xxzkid.github.io/2018/canal-quickstart/