我们也会用幂等处理类似的东西。
1.你要么单条数据处理
2.要么保证每个事务之间不会出现冲突才行，比如楼上说了key by 之类的
在 2020-06-03 15:41:44，"1048262223" <1048262...@qq.com> 写道：
>Hi
>
>可以辛苦贴一下上下文吗，什么场景，mysql的sql是什么。可以先判断是什么导致了MySQL死锁，我理解如果可以对上游做主键keyby，那么下游同时只有一个算子在处理同一个主键。
>
>
>Best,
>Yichao Yang
>
>
>
>
>------------------ 原始邮件 ------------------
>发件人: "Px New"<15701181132mr....@gmail.com>;
>发送时间: 2020年6月3日(星期三) 中午11:35
>收件人: "user-zh"<user-zh@flink.apache.org>;
>
>主题: Re: flink数据sink到mysql 是事务处理
>
>
>
>Hi 我最近在处理幂等性写入Mysql 但相关文档太少并没有实质性的操作, 所有方便参观下你这边实务写入的code吗? 非常感谢你
>也可发code到我的email 15701181132mr....@gmail.com
>
>1101300123 <hdxg1101300...@163.com> 于2020年4月10日周五 上午11:42写道：
>
>>
>>
>>
>目前使用flink处理kafka数据后sink到mysql，处理完的数据是一个用户ID对应多条记录，都要插入到mysql，所以在sink中会循环list把数据组装成batch提交，所以mysql开启了事务保证一批数据的事务。现在发现程序运行几个小时候会出现mysql死锁！想了解一下大家是怎么处理sink端
>> 多条记录的操作
>> sink的invoke代码
>> @Override
>> public void invoke(Tuple5<String, String, String, String,
>> List<BroadBandReq>> value, Context context) throws Exception {
>> connection.setAutoCommit(false);
>> List<BroadBandReq> f4 = value.f4;
>> for (BroadBandReq rs: f4){
>> statement.setString(1,rs.getUserId());
>> statement.setString(2,rs.getPhoneNum());
>> statement.setString(3,rs.getProvId());
>> statement.addBatch();
>> }
>> try {
>> statement.executeBatch();
>> connection.commit();
>> }catch (Exception e){
>> LOG.info(" add data for rds ; operTag:{},
>> userId:{},removeTag:{},stateCode:{}, phoneList:{}", value.f0, value.f1,
>> value.f2, value.f3,f4);
>> connection.rollback();
>> e.printStackTrace();
>>
>throw new Exception(e);
>> }
>> }
>>
>>
>>
>>
>> java.lang.Exception: java.sql.BatchUpdateException: Deadlock found when
>> trying to get lock; try restarting transaction
>> at
>com.mycom.ogg.RdsOperaterSink.invoke(RdsOperaterSink.java:73)
>> at
>com.mycom.ogg.RdsOperaterSink.invoke(RdsOperaterSink.java:18)
>> at
>>
>org.apache.flink.streaming.api.operators.StreamSink.processElement(StreamSink.java:56)
>> at
>>
>org.apache.flink.streaming.runtime.tasks.OperatorChain$CopyingChainingOutput.pushToOperator(OperatorChain.java:641)
>> at
>>
>org.apache.flink.streaming.runtime.tasks.OperatorChain$CopyingChainingOutput.collect(OperatorChain.java:616)
>> at
>>
>org.apache.flink.streaming.runtime.tasks.OperatorChain$CopyingChainingOutput.collect(OperatorChain.java:596)
>> at
>>
>org.apache.flink.streaming.api.operators.AbstractStreamOperator$CountingOutput.collect(AbstractStreamOperator.java:730)
>> at
>>
>org.apache.flink.streaming.api.operators.AbstractStreamOperator$CountingOutput.collect(AbstractStreamOperator.java:708)
>> at
>>
>org.apache.flink.streaming.api.operators.StreamFilter.processElement(StreamFilter.java:40)
>> at
>>
>org.apache.flink.streaming.runtime.tasks.OperatorChain$CopyingChainingOutput.pushToOperator(OperatorChain.java:641)
>> at
>>
>org.apache.flink.streaming.runtime.tasks.OperatorChain$CopyingChainingOutput.collect(OperatorChain.java:627)
>> at
>>
>org.apache.flink.streaming.runtime.tasks.OperatorChain$BroadcastingOutputCollector.collect(OperatorChain.java:718)
>> at
>>
>org.apache.flink.streaming.api.operators.AbstractStreamOperator$CountingOutput.collect(AbstractStreamOperator.java:736)
>> at
>>
>org.apache.flink.streaming.api.operators.ProcessOperator$ContextImpl.output(ProcessOperator.java:102)
>> at
>>
>com.unicom.ogg.ExtractOggApplicationV2$6.processElement(ExtractOggApplicationV2.java:162)
>> at
>>
>com.unicom.ogg.ExtractOggApplicationV2$6.processElement(ExtractOggApplicationV2.java:157)
>> at
>>
>org.apache.flink.streaming.api.operators.ProcessOperator.processElement(ProcessOperator.java:66)
>> at
>>
>org.apache.flink.streaming.runtime.tasks.OperatorChain$CopyingChainingOutput.pushToOperator(OperatorChain.java:641)
>> at
>>
>org.apache.flink.streaming.runtime.tasks.OperatorChain$CopyingChainingOutput.collect(OperatorChain.java:616)
>> at
>>
>org.apache.flink.streaming.runtime.tasks.OperatorChain$CopyingChainingOutput.collect(OperatorChain.java:596)
>> at
>>
>org.apache.flink.streaming.api.operators.AbstractStreamOperator$CountingOutput.collect(AbstractStreamOperator.java:730)
>> at
>>
>org.apache.flink.streaming.api.operators.AbstractStreamOperator$CountingOutput.collect(AbstractStreamOperator.java:708)
>> at
>>
>org.apache.flink.streaming.api.operators.StreamFilter.processElement(StreamFilter.java:40)
>> at
>>
>org.apache.flink.streaming.runtime.tasks.OneInputStreamTask$StreamTaskNetworkOutput.emitRecord(OneInputStreamTask.java:173)
>> at
>org.apache.flink.streaming.runtime.io
>> .StreamTaskNetworkInput.processElement(StreamTaskNetworkInput.java:151)
>> at
>org.apache.flink.streaming.runtime.io
>> .StreamTaskNetworkInput.emitNext(StreamTaskNetworkInput.java:128)
>> at
>org.apache.flink.streaming.runtime.io
>> .StreamOneInputProcessor.processInput(StreamOneInputProcessor.java:69)
>> at
>>
>org.apache.flink.streaming.runtime.tasks.StreamTask.processInput(StreamTask.java:311)
>> at
>>
>org.apache.flink.streaming.runtime.tasks.mailbox.MailboxProcessor.runMailboxLoop(MailboxProcessor.java:187)
>> at
>>
>org.apache.flink.streaming.runtime.tasks.StreamTask.runMailboxLoop(StreamTask.java:487)
>> at
>>
>org.apache.flink.streaming.runtime.tasks.StreamTask.invoke(StreamTask.java:470)
>> at
>org.apache.flink.runtime.taskmanager.Task.doRun(Task.java:707)
>> at
>org.apache.flink.runtime.taskmanager.Task.run(Task.java:532)
>> at
>java.lang.Thread.run(Thread.java:748)
>> Caused by: java.sql.BatchUpdateException: Deadlock found when trying to
>> get lock; try restarting transaction
>> at
>sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native
>> Method)
>> at
>>
>sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)
>> at
>>
>sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
>> at
>java.lang.reflect.Constructor.newInstance(Constructor.java:423)
>> at
>com.mysql.jdbc.Util.handleNewInstance(Util.java:425)
>> at
>com.mysql.jdbc.Util.getInstance(Util.java:408)
>> at
>> com.mysql.jdbc.SQLError.createBatchUpdateException(SQLError.java:1163)
>> at
>>
>com.mysql.jdbc.PreparedStatement.executeBatchSerially(PreparedStatement.java:1772)
>> at
>>
>com.mysql.jdbc.PreparedStatement.executeBatchInternal(PreparedStatement.java:1262)
>> at
>> com.mysql.jdbc.StatementImpl.executeBatch(StatementImpl.java:970)
>> at
>com.mycom.ogg.RdsOperaterSink.invoke(RdsOperaterSink.java:67)
>> ... 33 more
>> Caused by:
>> com.mysql.jdbc.exceptions.jdbc4.MySQLTransactionRollbackException:
>Deadlock
>> found when trying to get lock; try restarting transaction
>> at
>sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native
>> Method)
>> at
>>
>sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)
>> at
>>
>sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
>> at
>java.lang.reflect.Constructor.newInstance(Constructor.java:423)
>> at
>com.mysql.jdbc.Util.handleNewInstance(Util.java:425)
>> at
>com.mysql.jdbc.Util.getInstance(Util.java:408)
>> at
>com.mysql.jdbc.SQLError.createSQLException(SQLError.java:952)
>> at
>com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3976)
>> at
>com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3912)
>> at
>com.mysql.jdbc.MysqlIO.sendCommand(MysqlIO.java:2530)
>> at
>com.mysql.jdbc.MysqlIO.sqlQueryDirect(MysqlIO.java:2683)
>> at
>com.mysql.jdbc.ConnectionImpl.execSQL(ConnectionImpl.java:2486)
>> at
>>
>com.mysql.jdbc.PreparedStatement.executeInternal(PreparedStatement.java:1858)
>> at
>>
>com.mysql.jdbc.PreparedStatement.executeUpdateInternal(PreparedStatement.java:2079)
>> at
>>
>com.mysql.jdbc.PreparedStatement.executeBatchSerially(PreparedStatement.java:1756)
>> ... 36 more
>> [flink-akka.actor.default-dispatcher-783]
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
