(安装部署过程略)
准备三个数据库:flink_source、flink_sink、flink_sink_second。
将flink_source.source_test表实时同步到flink_sink和flink_sink_second的sink_test表。
(建库建表过程略)
开发过程可以参考Flink CDC官网的例子(譬如:基于 Flink CDC 构建 MySQL 和 Postgres 的 Streaming ETL)。
这里介绍的是MySQL到MySQL的同步,稍有不同,需要下载JDBC SQL连接器的依赖包(下载地址,使用方法),放到目录 {flink-1.16.1}/lib/ 下,用于使用JDBC SQL连接器连接MySQL的sink库。
✳注意下面两个jar的区别,是需要将flink-sql-connector-mysql-cdc-2.3.0.jar放到{flink-1.16.1}/lib/ 下。由于网络限制,本人最初是通过maven下载的flink-connector-mysql-cdc-2.3.0.jar,导致了各种找不到类的异常。
flink-sql-connector-mysql-cdc-2.3.0.jar(包含有依赖的jar)
flink-connector-mysql-cdc-2.3.0.jar(不包含依赖jar)
flink-sql-connector-mysql-cdc-2.3.0.jar:
com.ververica flink-sql-connector-mysql-cdc 2.3.0
flink-connector-mysql-cdc-2.3.0.jar:
com.ververica flink-connector-mysql-cdc 2.3.0
使用下面的命令启动 Flink SQL CLI
./bin/sql-client.sh
然后使用下面的建表语句创建Flink表,以及将flink_source.source_test表实时同步到flink_sink、flink_sink_second的sink_test表。
Flink SQL> SET execution.checkpointing.interval = 3s; [INFO] Session property has been set. Flink SQL> CREATE TABLE source_test ( > user_id STRING, > user_name STRING, > PRIMARY KEY (user_id) NOT ENFORCED > ) WITH ( > 'connector' = 'mysql-cdc', > 'hostname' = '192.168.3.31', > 'port' = '3306', > 'username' = 'root', > 'password' = '******', > 'database-name' = 'flink_source', > 'table-name' = 'source_test' > ); [INFO] Execute statement succeed. Flink SQL> CREATE TABLE sink_test ( > user_id STRING, > user_name STRING, > PRIMARY KEY (user_id) NOT ENFORCED > ) WITH ( > 'connector' = 'jdbc', > 'url' = 'jdbc:mysql://192.168.3.31:3306/flink_sink', > 'driver' = 'com.mysql.cj.jdbc.Driver', > 'username' = 'root', > 'password' = '******', > 'table-name' = 'sink_test' > ); [INFO] Execute statement succeed. Flink SQL> CREATE TABLE sink_test_second ( > user_id STRING, > user_name STRING, > PRIMARY KEY (user_id) NOT ENFORCED > ) WITH ( > 'connector' = 'jdbc', > 'url' = 'jdbc:mysql://192.168.3.31:3306/flink_sink_second', > 'driver' = 'com.mysql.cj.jdbc.Driver', > 'username' = 'root', > 'password' = '******', > 'table-name' = 'sink_test' > ); [INFO] Execute statement succeed. Flink SQL> insert into sink_test select * from source_test; [INFO] Submitting SQL update statement to the cluster... [INFO] SQL update statement has been successfully submitted to the cluster: Job ID: 0c49758cc251699f0b4acd6c9f735e6e Flink SQL> insert into sink_test_second select * from source_test; [INFO] Submitting SQL update statement to the cluster... [INFO] SQL update statement has been successfully submitted to the cluster: Job ID: ecea685a715d7d40ee1a94aac3236c18 Flink SQL>
访问Flink web:http://192.168.137.99:8081/#/job/running,可以看到已经新建了两个作业。
直接贴代码。
pom.xml:
4.0.0 org.example FlinkDemo 1.0-SNAPSHOT jar 8 8 UTF-8 1.16.1 2.3.0 org.apache.flink flink-java ${flink.version} org.apache.flink flink-clients ${flink.version} org.apache.flink flink-streaming-java ${flink.version} org.apache.flink flink-table-api-java-bridge ${flink.version} org.apache.flink flink-table-planner-loader ${flink.version} org.apache.flink flink-table-runtime ${flink.version} org.apache.flink flink-connector-base ${flink.version} org.apache.flink flink-connector-jdbc ${flink.version} com.ververica flink-sql-connector-mysql-cdc ${flink-cdc.version}
FlinkDemo.java:
package org.example; import org.apache.flink.streaming.api.environment.StreamExecutionEnvironment; import org.apache.flink.table.api.EnvironmentSettings; import org.apache.flink.table.api.bridge.java.StreamTableEnvironment; public class FlinkDemo { public static void main(String[] args) throws Exception { StreamExecutionEnvironment env = null; // 本机执行环境 env = StreamExecutionEnvironment.getExecutionEnvironment(); // 远程执行环境 // env = StreamExecutionEnvironment.createRemoteEnvironment("192.168.137.99", 8081); env.enableCheckpointing(3000l).setParallelism(2); EnvironmentSettings settings = EnvironmentSettings .newInstance() .inStreamingMode() .build(); StreamTableEnvironment tableEnv = StreamTableEnvironment.create(env, settings); // CREATE TABLE source_test tableEnv.executeSql(sourceDDL()); // CREATE TABLE sink_test tableEnv.executeSql(sinkDDL()); // CREATE TABLE sink_test_second tableEnv.executeSql(sinkDDLOfSecondDb()); // 将source_test同步到sink_test和sink_test_second tableEnv.getConfig().set("pipeline.name", "Flink Demo - To sink_test"); // 设置job名称 tableEnv.executeSql("insert into sink_test select * from source_test;"); tableEnv.getConfig().set("pipeline.name", "Flink Demo - To sink_test_second"); // 设置job名称 tableEnv.executeSql("insert into sink_test_second select * from source_test;"); } public static String sourceDDL() { String sourceDDL = "CREATE TABLE source_test (\n" + " user_id STRING,\n" + " user_name STRING,\n" + " PRIMARY KEY (user_id) NOT ENFORCED\n" + ") WITH (\n" + " 'connector' = 'mysql-cdc',\n" + " 'hostname' = '192.168.3.31',\n" + " 'port' = '3306',\n" + " 'username' = 'root',\n" + " 'password' = '******',\n" + " 'database-name' = 'flink_source',\n" + " 'table-name' = 'source_test'\n" + ");"; return sourceDDL; } public static String sinkDDL() { String sinkDDL = "CREATE TABLE sink_test (\n" + " user_id STRING,\n" + " user_name STRING,\n" + " PRIMARY KEY (user_id) NOT ENFORCED\n" + ") WITH (\n" + " 'connector' = 'jdbc',\n" + " 'url' = 'jdbc:mysql://192.168.3.31:3306/flink_sink',\n" + " 'driver' = 'com.mysql.cj.jdbc.Driver',\n" + " 'username' = 'root',\n" + " 'password' = '******',\n" + " 'table-name' = 'sink_test'\n" + ");"; return sinkDDL; } public static String sinkDDLOfSecondDb() { String sinkDDL = "CREATE TABLE sink_test_second (\n" + " user_id STRING,\n" + " user_name STRING,\n" + " PRIMARY KEY (user_id) NOT ENFORCED\n" + ") WITH (\n" + " 'connector' = 'jdbc',\n" + " 'url' = 'jdbc:mysql://192.168.3.31:3306/flink_sink_second',\n" + " 'driver' = 'com.mysql.cj.jdbc.Driver',\n" + " 'username' = 'root',\n" + " 'password' = '******',\n" + " 'table-name' = 'sink_test'\n" + ");"; return sinkDDL; } }
提交SQL作业到远程Flink集群上执行,需要使用下面的方法创建执行环境:
StreamExecutionEnvironment.createRemoteEnvironment("192.168.137.99", 8081);
而本机执行是:
StreamExecutionEnvironment.getExecutionEnvironment();
上面的FlinkDemo.java,修改执行环境后,运行代码提交作业:
另外在远程执行的时候,必须使用flink-sql-connector-mysql-cdc,不能使用flink-connector-mysql-cdc。否则会报错:Caused by: java.io.StreamCorruptedException: unexpected block data
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.1\awaitility-4.0.1.jar;E:\java\.m2\repository\org\hamcrest\hamcrest\2.1\hamcrest-2.1.jar" org.example.FlinkDemo SLF4J: Failed to load class "org.slf4j.impl.StaticLoggerBinder". SLF4J: Defaulting to no-operation (NOP) logger implementation SLF4J: See http://www.slf4j.org/codes.html#StaticLoggerBinder for further details. Exception in thread "main" org.apache.flink.table.api.TableException: Failed to execute sql at org.apache.flink.table.api.internal.TableEnvironmentImpl.executeInternal(TableEnvironmentImpl.java:867) at org.apache.flink.table.api.internal.TableEnvironmentImpl.executeInternal(TableEnvironmentImpl.java:827) at org.apache.flink.table.api.internal.TableEnvironmentImpl.executeInternal(TableEnvironmentImpl.java:918) at org.apache.flink.table.api.internal.TableEnvironmentImpl.executeSql(TableEnvironmentImpl.java:730) at org.example.FlinkDemo.main(FlinkDemo.java:29) Caused by: org.apache.flink.util.FlinkException: Failed to execute job 'Flink Demo - To sink_test'. at org.apache.flink.streaming.api.environment.StreamExecutionEnvironment.executeAsync(StreamExecutionEnvironment.java:2203) at org.apache.flink.table.planner.delegation.DefaultExecutor.executeAsync(DefaultExecutor.java:95) at org.apache.flink.table.api.internal.TableEnvironmentImpl.executeInternal(TableEnvironmentImpl.java:850) ... 4 more Caused by: java.lang.RuntimeException: org.apache.flink.runtime.client.JobInitializationException: Could not start the JobMaster. at org.apache.flink.util.ExceptionUtils.rethrow(ExceptionUtils.java:321) at org.apache.flink.util.function.FunctionUtils.lambda$uncheckedFunction$2(FunctionUtils.java:75) at java.util.concurrent.CompletableFuture.uniApply(CompletableFuture.java:616) at java.util.concurrent.CompletableFuture$UniApply.tryFire(CompletableFuture.java:591) at java.util.concurrent.CompletableFuture$Completion.exec(CompletableFuture.java:457) at java.util.concurrent.ForkJoinTask.doExec(ForkJoinTask.java:289) at java.util.concurrent.ForkJoinPool$WorkQueue.runTask(ForkJoinPool.java:1067) at java.util.concurrent.ForkJoinPool.runWorker(ForkJoinPool.java:1703) at java.util.concurrent.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:172) Caused by: org.apache.flink.runtime.client.JobInitializationException: Could not start the JobMaster. at org.apache.flink.runtime.jobmaster.DefaultJobMasterServiceProcess.lambda$new$0(DefaultJobMasterServiceProcess.java:97) at java.util.concurrent.CompletableFuture.uniWhenComplete(CompletableFuture.java:774) at java.util.concurrent.CompletableFuture$UniWhenComplete.tryFire(CompletableFuture.java:750) at java.util.concurrent.CompletableFuture.postComplete(CompletableFuture.java:488) at java.util.concurrent.CompletableFuture$AsyncSupply.run(CompletableFuture.java:1609) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624) at java.lang.Thread.run(Thread.java:750) Caused by: java.util.concurrent.CompletionException: java.lang.RuntimeException: org.apache.flink.runtime.JobException: Cannot instantiate the coordinator for operator Source: source_test[1] -> DropUpdateBefore[2] -> ConstraintEnforcer[3] -> Sink: sink_test[3] at java.util.concurrent.CompletableFuture.encodeThrowable(CompletableFuture.java:273) at java.util.concurrent.CompletableFuture.completeThrowable(CompletableFuture.java:280) at java.util.concurrent.CompletableFuture$AsyncSupply.run(CompletableFuture.java:1606) ... 3 more Caused by: java.lang.RuntimeException: org.apache.flink.runtime.JobException: Cannot instantiate the coordinator for operator Source: source_test[1] -> DropUpdateBefore[2] -> ConstraintEnforcer[3] -> Sink: sink_test[3] at org.apache.flink.util.ExceptionUtils.rethrow(ExceptionUtils.java:321) at org.apache.flink.util.function.FunctionUtils.lambda$uncheckedSupplier$4(FunctionUtils.java:114) at java.util.concurrent.CompletableFuture$AsyncSupply.run(CompletableFuture.java:1604) ... 3 more Caused by: org.apache.flink.runtime.JobException: Cannot instantiate the coordinator for operator Source: source_test[1] -> DropUpdateBefore[2] -> ConstraintEnforcer[3] -> Sink: sink_test[3] at org.apache.flink.runtime.executiongraph.ExecutionJobVertex.initialize(ExecutionJobVertex.java:229) at org.apache.flink.runtime.executiongraph.DefaultExecutionGraph.initializeJobVertex(DefaultExecutionGraph.java:901) at org.apache.flink.runtime.executiongraph.DefaultExecutionGraph.initializeJobVertices(DefaultExecutionGraph.java:891) at org.apache.flink.runtime.executiongraph.DefaultExecutionGraph.attachJobGraph(DefaultExecutionGraph.java:848) at org.apache.flink.runtime.executiongraph.DefaultExecutionGraph.attachJobGraph(DefaultExecutionGraph.java:830) at org.apache.flink.runtime.executiongraph.DefaultExecutionGraphBuilder.buildGraph(DefaultExecutionGraphBuilder.java:203) at org.apache.flink.runtime.scheduler.DefaultExecutionGraphFactory.createAndRestoreExecutionGraph(DefaultExecutionGraphFactory.java:156) at org.apache.flink.runtime.scheduler.SchedulerBase.createAndRestoreExecutionGraph(SchedulerBase.java:361) at org.apache.flink.runtime.scheduler.SchedulerBase.(SchedulerBase.java:206) at org.apache.flink.runtime.scheduler.DefaultScheduler. (DefaultScheduler.java:134) at org.apache.flink.runtime.scheduler.DefaultSchedulerFactory.createInstance(DefaultSchedulerFactory.java:152) at org.apache.flink.runtime.jobmaster.DefaultSlotPoolServiceSchedulerFactory.createScheduler(DefaultSlotPoolServiceSchedulerFactory.java:119) at org.apache.flink.runtime.jobmaster.JobMaster.createScheduler(JobMaster.java:369) at org.apache.flink.runtime.jobmaster.JobMaster. (JobMaster.java:346) at org.apache.flink.runtime.jobmaster.factories.DefaultJobMasterServiceFactory.internalCreateJobMasterService(DefaultJobMasterServiceFactory.java:123) at org.apache.flink.runtime.jobmaster.factories.DefaultJobMasterServiceFactory.lambda$createJobMasterService$0(DefaultJobMasterServiceFactory.java:95) at org.apache.flink.util.function.FunctionUtils.lambda$uncheckedSupplier$4(FunctionUtils.java:112) ... 4 more Caused by: java.io.StreamCorruptedException: unexpected block data at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1685) at java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:2430) at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:2310) at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:2212) at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1668) at java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:2430) at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:2310) at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:2212) at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1668) at java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:2430) at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:2310) at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:2212) at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1668) at java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:2430) at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:2354) at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:2212) at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1668) at java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:2430) at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:2354) at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:2212) at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1668) at java.io.ObjectInputStream.readArray(ObjectInputStream.java:2118) at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1656) at java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:2430) at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:2354) at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:2212) at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1668) at java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:2430) at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:2354) at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:2212) at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1668) at java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:2430) at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:2354) at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:2212) at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1668) at java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:2430) at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:2354) at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:2212) at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1668) at java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:2430) at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:2354) at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:2212) at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1668) at java.io.ObjectInputStream.readObject(ObjectInputStream.java:502) at java.io.ObjectInputStream.readObject(ObjectInputStream.java:460) at org.apache.flink.util.InstantiationUtil.deserializeObject(InstantiationUtil.java:617) at org.apache.flink.util.InstantiationUtil.deserializeObject(InstantiationUtil.java:602) at org.apache.flink.util.InstantiationUtil.deserializeObject(InstantiationUtil.java:589) at org.apache.flink.util.SerializedValue.deserializeValue(SerializedValue.java:67) at org.apache.flink.runtime.operators.coordination.OperatorCoordinatorHolder.create(OperatorCoordinatorHolder.java:488) at org.apache.flink.runtime.executiongraph.ExecutionJobVertex.createOperatorCoordinatorHolder(ExecutionJobVertex.java:286) at org.apache.flink.runtime.executiongraph.ExecutionJobVertex.initialize(ExecutionJobVertex.java:223) ... 20 more Process finished with exit code 1