Dolphinscheduler调度生成工作流未生成任务解决历程 one result (or null) to be returned by selectOne(),but found: 2

背景：

问题发生在上线调度，手动启任务时出现，master报如下错误：发现好几个任务失效

[ERROR] 2022-08-01 09:59:57.988 org.apache.dolphinscheduler.server.master.runner.WorkflowExecuteThread:[244] - handler error:
org.mybatis.spring.MyBatisSystemException: nested exception is org.apache.ibatis.exceptions.TooManyResultsException: Expected one result (or null) to be returned by selectOne(), but found: 2
	at org.mybatis.spring.MyBatisExceptionTranslator.translateExceptionIfPossible(MyBatisExceptionTranslator.java:78)
	at org.mybatis.spring.SqlSessionTemplate$SqlSessionInterceptor.invoke(SqlSessionTemplate.java:440)
	at com.sun.proxy.$Proxy91.selectOne(Unknown Source)
	at org.mybatis.spring.SqlSessionTemplate.selectOne(SqlSessionTemplate.java:159)
	at com.baomidou.mybatisplus.core.override.MybatisMapperMethod.execute(MybatisMapperMethod.java:89)
	at com.baomidou.mybatisplus.core.override.MybatisMapperProxy.invoke(MybatisMapperProxy.java:61)
	at com.sun.proxy.$Proxy115.queryByDefinitionCodeAndVersion(Unknown Source)
	at sun.reflect.GeneratedMethodAccessor184.invoke(Unknown Source)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:498)
	at org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:344)
	at org.springframework.aop.framework.ReflectiveMethodInvocation.invokeJoinpoint(ReflectiveMethodInvocation.java:198)
	at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:163)
	at org.springframework.cache.interceptor.CacheInterceptor.lambda$invoke$0(CacheInterceptor.java:54)
	at org.springframework.cache.interceptor.CacheAspectSupport.invokeOperation(CacheAspectSupport.java:366)
	at org.springframework.cache.interceptor.CacheAspectSupport.lambda$handleSynchronizedGet$1(CacheAspectSupport.java:447)
	at org.springframework.cache.support.NoOpCache.get(NoOpCache.java:76)
	at org.springframework.cache.interceptor.CacheAspectSupport.handleSynchronizedGet(CacheAspectSupport.java:442)
	at org.springframework.cache.interceptor.CacheAspectSupport.execute(CacheAspectSupport.java:382)
	at org.springframework.cache.interceptor.CacheAspectSupport.execute(CacheAspectSupport.java:345)
	at org.springframework.cache.interceptor.CacheInterceptor.invoke(CacheInterceptor.java:64)
	at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:186)
	at org.springframework.aop.interceptor.ExposeInvocationInterceptor.invoke(ExposeInvocationInterceptor.java:97)
	at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:186)
	at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:215)
	at com.sun.proxy.$Proxy116.queryByDefinitionCodeAndVersion(Unknown Source)
	at org.apache.dolphinscheduler.service.process.ProcessService.findTaskDefinition(ProcessService.java:2474)
	at org.apache.dolphinscheduler.service.process.ProcessService.lambda$getTaskDefineLogListByRelation$4(ProcessService.java:2465)
	at java.util.HashMap.forEach(HashMap.java:1289)
	at org.apache.dolphinscheduler.service.process.ProcessService.getTaskDefineLogListByRelation(ProcessService.java:2464)
	at org.apache.dolphinscheduler.service.process.ProcessService$$FastClassBySpringCGLIB$$ed138739.invoke(<generated>)
	at org.springframework.cglib.proxy.MethodProxy.invoke(MethodProxy.java:218)
	at org.springframework.aop.framework.CglibAopProxy$DynamicAdvisedInterceptor.intercept(CglibAopProxy.java:689)
	at org.apache.dolphinscheduler.service.process.ProcessService$$EnhancerBySpringCGLIB$$315b33b2.getTaskDefineLogListByRelation(<generated>)
	at org.apache.dolphinscheduler.server.master.runner.WorkflowExecuteThread.buildFlowDag(WorkflowExecuteThread.java:578)
	at org.apache.dolphinscheduler.server.master.runner.WorkflowExecuteThread.startProcess(WorkflowExecuteThread.java:542)
	at org.apache.dolphinscheduler.server.master.runner.WorkflowExecuteThread.run(WorkflowExecuteThread.java:239)
	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
	at com.谷歌.common.util.concurrent.TrustedListenableFutureTask$TrustedFutureInterruptibleTask.runInterruptibly(TrustedListenableFutureTask.java:125)
	at com.谷歌.common.util.concurrent.InterruptibleTask.run(InterruptibleTask.java:57)
	at com.谷歌.common.util.concurrent.TrustedListenableFutureTask.run(TrustedListenableFutureTask.java:78)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
	at java.lang.Thread.run(Thread.java:748)
Caused by: org.apache.ibatis.exceptions.TooManyResultsException: Expected one result (or null) to be returned by selectOne(), but found: 2
	at org.apache.ibatis.session.defaults.DefaultSqlSession.selectOne(DefaultSqlSession.java:80)
	at sun.reflect.GeneratedMethodAccessor114.invoke(Unknown Source)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:498)
	at org.mybatis.spring.SqlSessionTemplate$SqlSessionInterceptor.invoke(SqlSessionTemplate.java:426)
	... 42 common frames omitted

现象

上线完成手动运行任务时发现工作流实例启动运行，但是任务实例一直启动不起来。

查看master日志可以看到报错如下：

[ERROR] 2022-08-05 10:48:30.764 org.apache.dolphinscheduler.server.master.runner.WorkflowExecuteThread:[244] - handler error:
org.mybatis.spring.MyBatisSystemException: nested exception is org.apache.ibatis.exceptions.TooManyResultsException: Expected one result (or null) to be returned by selectOne(), but found: 2
	at org.mybatis.spring.MyBatisExceptionTranslator.translateExceptionIfPossible(MyBatisExceptionTranslator.java:78)
	at org.mybatis.spring.SqlSessionTemplate$SqlSessionInterceptor.invoke(SqlSessionTemplate.java:440)
	at com.sun.proxy.$Proxy91.selectOne(Unknown Source)
	at org.mybatis.spring.SqlSessionTemplate.selectOne(SqlSessionTemplate.java:159)
	at com.baomidou.mybatisplus.core.override.MybatisMapperMethod.execute(MybatisMapperMethod.java:89)
	at com.baomidou.mybatisplus.core.override.MybatisMapperProxy.invoke(MybatisMapperProxy.java:61)
	at com.sun.proxy.$Proxy115.queryByDefinitionCodeAndVersion(Unknown Source)
	at sun.reflect.GeneratedMethodAccessor246.invoke(Unknown Source)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:498)
	at org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:344)
	at org.springframework.aop.framework.ReflectiveMethodInvocation.invokeJoinpoint(ReflectiveMethodInvocation.java:198)
	at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:163)
	at org.springframework.cache.interceptor.CacheInterceptor.lambda$invoke$0(CacheInterceptor.java:54)
	at org.springframework.cache.interceptor.CacheAspectSupport.invokeOperation(CacheAspectSupport.java:366)
	at org.springframework.cache.interceptor.CacheAspectSupport.lambda$handleSynchronizedGet$1(CacheAspectSupport.java:447)
	at org.springframework.cache.support.NoOpCache.get(NoOpCache.java:76)
	at org.springframework.cache.interceptor.CacheAspectSupport.handleSynchronizedGet(CacheAspectSupport.java:442)
	at org.springframework.cache.interceptor.CacheAspectSupport.execute(CacheAspectSupport.java:382)
	at org.springframework.cache.interceptor.CacheAspectSupport.execute(CacheAspectSupport.java:345)
	at org.springframework.cache.interceptor.CacheInterceptor.invoke(CacheInterceptor.java:64)
	at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:186)
	at org.springframework.aop.interceptor.ExposeInvocationInterceptor.invoke(ExposeInvocationInterceptor.java:97)
	at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:186)
	at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:215)
	at com.sun.proxy.$Proxy116.queryByDefinitionCodeAndVersion(Unknown Source)
	at org.apache.dolphinscheduler.service.process.ProcessService.findTaskDefinition(ProcessService.java:2474)
	at org.apache.dolphinscheduler.service.process.ProcessService.lambda$getTaskDefineLogListByRelation$4(ProcessService.java:2465)
	at java.util.HashMap.forEach(HashMap.java:1289)
	at org.apache.dolphinscheduler.service.process.ProcessService.getTaskDefineLogListByRelation(ProcessService.java:2464)
	at org.apache.dolphinscheduler.service.process.ProcessService$$FastClassBySpringCGLIB$$ed138739.invoke(<generated>)
	at org.springframework.cglib.proxy.MethodProxy.invoke(MethodProxy.java:218)
	at org.springframework.aop.framework.CglibAopProxy$DynamicAdvisedInterceptor.intercept(CglibAopProxy.java:689)
	at org.apache.dolphinscheduler.service.process.ProcessService$$EnhancerBySpringCGLIB$$bf03c416.getTaskDefineLogListByRelation(<generated>)
	at org.apache.dolphinscheduler.server.master.runner.WorkflowExecuteThread.buildFlowDag(WorkflowExecuteThread.java:578)
	at org.apache.dolphinscheduler.server.master.runner.WorkflowExecuteThread.startProcess(WorkflowExecuteThread.java:542)
	at org.apache.dolphinscheduler.server.master.runner.WorkflowExecuteThread.run(WorkflowExecuteThread.java:239)
	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
	at com.谷歌.common.util.concurrent.TrustedListenableFutureTask$TrustedFutureInterruptibleTask.runInterruptibly(TrustedListenableFutureTask.java:125)
	at com.谷歌.common.util.concurrent.InterruptibleTask.run(InterruptibleTask.java:57)
	at com.谷歌.common.util.concurrent.TrustedListenableFutureTask.run(TrustedListenableFutureTask.java:78)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
	at java.lang.Thread.run(Thread.java:748)
Caused by: org.apache.ibatis.exceptions.TooManyResultsException: Expected one result (or null) to be returned by selectOne(), but found: 2
	at org.apache.ibatis.session.defaults.DefaultSqlSession.selectOne(DefaultSqlSession.java:80)
	at sun.reflect.GeneratedMethodAccessor79.invoke(Unknown Source)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:498)
	at org.mybatis.spring.SqlSessionTemplate$SqlSessionInterceptor.invoke(SqlSessionTemplate.java:426)
	... 42 common frames omitted

分析：

简单的看日志无法定位到问题，只是知道是dolphinscheduler和任务或者资源相关的表中的某些任务数据重复。不知道是什么表，只能看源码了。我们查看报错日志发现，定位源码中的报错位置

定位queryByDefinitionCodeAndVersion方法的具体实现

我们由此继续查看了mybits对应的mapper文件中的查询sql

发现查询的数据主要来自t_ds_task_definition_log和t_ds_task_definition

于是我们执行

SELECT code ,version,COUNT(*) cnt  from t_ds_task_definition_log group by code ,version order by cnt desc

发现如下code的任务同一版本出现数据重复

5715108678048,6353133939232,6234790474016,6344296875552,6168625362464,6430246445344

方案：

查询官网我们发现这其实是dolphinscheduler伪分布式的一个bug，与写库时数据库事物有关。

官方说在高版本已经修复，考虑成本问题我们不在升级集群或者版本，我们这里采用了比较直接的方式，将重复数据中老的数据进行了删除。

操作

登录dolphinscheduler元数据库

t_ds_task_definition_log 数据处理

select * from t_ds_task_definition_log where code =  6430246445344;

delete from t_ds_task_definition_log where id = 419;

t_ds_task_definition 数据处理

select * from t_ds_task_definition where code =  6430246445344;

delete from t_ds_task_definition_log where id = 275;

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