问题一:7张表是同一个mysql中的,我们进行增量同步时分别用不同的flink任务读取,造成mysql server-id冲突问题,如下:
Caused by: io.debezium.DebeziumException: A slave with the same server_uuid/server_id as this slave has connected to the master; the first event ‘’ at 4, the last event read from ‘/home/mysql/log/mysql/mysql-bin.003630’ at 62726118, the last byte read from ‘/home/mysql/log/mysql/mysql-bin.003630’ at 62726118. Error code: 1236; SQLSTATE: HY000.
问题分析:主要是多个任务都读取的同一个binlog造成serverid冲突;
网上有设置server-id的方法,这个是可以解决的,但是需要分方案来谈;
例如:我们是需要一个任务通用的(7张表重复提交7次,更改flink传参)
这种就不适合我们,因为每次的任务都是同一个jar,读取一段时间后还是会报错;
解决方案:其实我们可以把在同一个mysql库里面的表放到同一个source里面;
解决代码:我们是mysql同步到starrocks里面,使用的sr官方的sink function,不同sink的可以参考这个源代码;
官方是推荐采用StarRocksSink.sink(options)这种方式,我们查看源码,其实是采用的v2这一个fun,点进去发现,sr官方对数据进行了处理,只需要匹配对应的类型即可;
所以我们只需要对mysqlSource进行一个算子转换即可,关键代码如下:
MySqlSourceBuilder<String> builder = new MySqlSourceBuilder<>();
MySqlSource<String> mySqlSource = builder
.hostname(srcHost)
.port(3306)
.databaseList(srcDb)
// 格式 db.table,db.table2......
.tableList(srcTable)
.username(srcUsername)
.password(srcPassword)
.jdbcProperties(jbdcProperties)
.debeziumProperties(properties)
// 这里反序列化我进行了StarRocks增删类型处理,具体可以看我这片文章https://blog.csdn.net/JGMa_TiMo/article/details/128327546
.deserializer(jsonStringDebeziumDeserializationSchema)
.serverId("5400-6400")
.build();
DataStreamSource<String> streamSource = env.fromSource(mySqlSource, WatermarkStrategy.forMonotonousTimestamps(), "[<< job: >>" + propKey + "]");
// .setParallelism(parallelism);
// todo 这里是关键地方,我们反序列化只能返回flink认可的类型,一般都是string,这里转换成上面sr可以处理的对象 StarRocksSinkRowDataWithMeta
SingleOutputStreamOperator<StarRocksSinkRowDataWithMeta> streamOperator = streamSource.flatMap(new FlatMapFunction<String, StarRocksSinkRowDataWithMeta>() {
@Override
public void flatMap(String value, Collector<StarRocksSinkRowDataWithMeta> collector) throws Exception {
HashMap hashMap = JsonUtils.parseObject(value, HashMap.class);
StarRocksSinkRowDataWithMeta sinkRowDataWithMeta = new StarRocksSinkRowDataWithMeta();
sinkRowDataWithMeta.addDataRow(value);
assert hashMap != null;
sinkRowDataWithMeta.setTable(hashMap.get("__table").toString());
sinkRowDataWithMeta.setDatabase(sinkDb);
collector.collect(sinkRowDataWithMeta);
}
}).name("Data Filtering");
StarRocksSinkOptions sinkOptions = StarRocksSinkOptions.builder()
.withProperty("jdbc-url", "jdbc:mysql://" + sinkHost + ":9030?characterEncoding=utf-8&useSSL=false&connectionTimeZone=Asia/Shanghai")
.withProperty("load-url", sinkHost + ":8030")
.withProperty("database-name", sinkDb)
.withProperty("username", sinkUsername)
.withProperty("password", sinkPassword)
// 这里的设置会被多srcTable覆盖
.withProperty("table-name", "")
.withProperty("sink.properties.format", "json")
.withProperty("sink.properties.strip_outer_array", "true")
.build();
// 这里查看sr sink源码实际使用的是这个fun,我们不要使用SinkFunctionFactory生成:会泛型不支持
streamOperator.addSink(new StarRocksDynamicSinkFunctionV2<>(sinkOptions))
.name(">>>StarRocks " + propKey + " Sink<<<").uid(UUID.randomUUID().toString());
// streamOperator.addSink(StarRocksSink.sink(sinkOptions))
// .name(">>>StarRocks " + propKey + " Sink<<<").uid(UUID.randomUUID().toString());
env.execute(propKey + "<< stream sync job >>" + srcHost + srcDb);
解读
:原理就是我们把原来7张在一个数据库的表放到一个flink source中读取,在指定传输到那个starrocks表时,官方已经实现了代码支持,我们只需要增加一个flink算子转换成sink支持的对象即可,(关联一个source对应多个sink解决思路)
问题二:我们是采用datastream api开发的flink任务,在web-ui界面提交任务,造成taskManager的jvm Metaspace一直增长直到节点挂掉。
报错就不贴了,就是taskmanager会自动挂掉,查看tm的日志是oom异常:jvm metaspace溢出;
问题分析:我们采用web-ui多次提交flink任务时,flink是动态类加载,所以不会释放上一个jar的元空间,才会造成jvm垃圾不回收;
可以看官方的issues:
https://issues.apache.org/jira/browse/FLINK-11205
https://issues.apache.org/jira/browse/FLINK-16408
问题解决:把jar放到flink/lib目录下就可以了,这样flink会优先加载父加载器中的类;
这里需要注意和以前的jar会造成版本冲突,具体解决你可以根据报错信息慢慢调试,我这里贴一个我的环境信息:当前环境中的lib包
我增加的lib包
下面是我的jar包依赖,打完包放到lib中即可
文章来源:https://www.toymoban.com/news/detail-695941.html
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<maven.compiler.source>8</maven.compiler.source>
<maven.compiler.target>8</maven.compiler.target>
<flink.version>1.15.3</flink.version>
<flink.connector.sr>1.2.5_flink-1.15</flink.connector.sr>
<flink.connector.mysql>2.3.0</flink.connector.mysql>
<scala.binary.version>2.12</scala.binary.version>
</properties>
<dependencies>
<dependency>
<groupId>org.apache.flink</groupId>
<artifactId>flink-runtime</artifactId>
<version>${flink.version}</version>
</dependency>
<dependency>
<groupId>org.apache.flink</groupId>
<artifactId>flink-table-api-java</artifactId>
<version>${flink.version}</version>
</dependency>
<dependency>
<groupId>org.apache.flink</groupId>
<artifactId>flink-connector-base</artifactId>
<version>${flink.version}</version>
</dependency>
<!-- 基础包 -->
<dependency>
<groupId>org.apache.flink</groupId>
<artifactId>flink-clients</artifactId>
<version>${flink.version}</version>
</dependency>
<dependency>
<groupId>org.apache.flink</groupId>
<artifactId>flink-streaming-java</artifactId>
<version>${flink.version}</version>
</dependency>
<dependency>
<groupId>com.starrocks</groupId>
<artifactId>flink-connector-starrocks</artifactId>
<version>${flink.connector.sr}</version>
</dependency>
<dependency>
<groupId>com.ververica</groupId>
<artifactId>flink-connector-mysql-cdc</artifactId>
<version>${flink.connector.mysql}</version>
</dependency>
<dependency>
<groupId>org.apache.flink</groupId>
<artifactId>flink-test-utils</artifactId>
<version>${flink.version}</version>
</dependency>
<dependency>
<groupId>org.apache.flink</groupId>
<artifactId>flink-table-test-utils</artifactId>
<version>${flink.version}</version>
</dependency>
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>8.0.29</version>
</dependency>
<dependency>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
<version>1.18.26</version>
</dependency>
<dependency>
<groupId>org.slf4j</groupId>
<artifactId>slf4j-api</artifactId>
<version>2.0.4</version>
</dependency>
<dependency>
<groupId>ch.qos.logback</groupId>
<artifactId>logback-classic</artifactId>
<version>1.3.4</version>
</dependency>
<dependency>
<groupId>org.apache.kafka</groupId>
<artifactId>connect-api</artifactId>
<version>2.7.1</version>
</dependency>
<dependency>
<groupId>org.apache.flink</groupId>
<artifactId>flink-shaded-hadoop-2</artifactId>
<version>2.8.3-10.0</version>
</dependency>
<dependency>
<groupId>commons-cli</groupId>
<artifactId>commons-cli</artifactId>
<version>1.5.0</version>
</dependency>
<dependency>
<groupId>log4j</groupId>
<artifactId>log4j</artifactId>
<version>1.2.17</version>
</dependency>
<dependency>
<groupId>cn.hutool</groupId>
<artifactId>hutool-all</artifactId>
<version>5.8.15</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-beans</artifactId>
<version>5.3.26</version>
</dependency>
<dependency>
<groupId>org.yaml</groupId>
<artifactId>snakeyaml</artifactId>
<version>2.0</version>
</dependency>
</dependencies>
问题二:最后就是在web-ui提交任务,你也可以用命令行,这里我用的源码包,就是我开发的实际编写代码,就几十K
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