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https://issues.apache.org/jira/browse/YARN-9817?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16924477#comment-16924477
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Prabhu Joseph commented on YARN-9817:
-------------------------------------

[~Tao Yang] [~zhuqi] Can you review this Jira when you get time. This fixes 
failing testcases after YARN-8995. The testcases has not initialized the 
AsyncDispatcher and so detailsInterval default value zero has caused it to fail.

> Fix failing testcases due to not initialized AsyncDispatcher -  
> ArithmeticException: / by zero
> ----------------------------------------------------------------------------------------------
>
>                 Key: YARN-9817
>                 URL: https://issues.apache.org/jira/browse/YARN-9817
>             Project: Hadoop YARN
>          Issue Type: Bug
>          Components: test
>    Affects Versions: 3.3.0, 3.2.1, 3.1.3
>            Reporter: Prabhu Joseph
>            Assignee: Prabhu Joseph
>            Priority: Major
>         Attachments: YARN-9817-001.patch
>
>
> Below testcases failing as Asyncdispatcher throws ArithmeticException: / by 
> zero
> {code}
>  hadoop.mapreduce.v2.app.TestRuntimeEstimators 
>  hadoop.mapreduce.v2.app.job.impl.TestJobImpl 
>  hadoop.mapreduce.v2.app.TestMRApp 
> {code}
> Error Message:
> {code}
> [ERROR] testUpdatedNodes(org.apache.hadoop.mapreduce.v2.app.TestMRApp)  Time 
> elapsed: 0.847 s  <<< ERROR!
> java.lang.ArithmeticException: / by zero
>       at 
> org.apache.hadoop.yarn.event.AsyncDispatcher$GenericEventHandler.handle(AsyncDispatcher.java:295)
>       at 
> org.apache.hadoop.mapreduce.v2.app.job.impl.JobImpl.handle(JobImpl.java:1015)
>       at 
> org.apache.hadoop.mapreduce.v2.app.job.impl.JobImpl.handle(JobImpl.java:141)
>       at 
> org.apache.hadoop.mapreduce.v2.app.MRAppMaster$JobEventDispatcher.handle(MRAppMaster.java:1544)
>       at 
> org.apache.hadoop.mapreduce.v2.app.MRAppMaster.serviceStart(MRAppMaster.java:1263)
>       at 
> org.apache.hadoop.service.AbstractService.start(AbstractService.java:194)
>       at org.apache.hadoop.mapreduce.v2.app.MRApp.submit(MRApp.java:301)
>       at org.apache.hadoop.mapreduce.v2.app.MRApp.submit(MRApp.java:285)
>       at 
> org.apache.hadoop.mapreduce.v2.app.TestMRApp.testUpdatedNodes(TestMRApp.java:223)
>       at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
>       at 
> sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
>       at 
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
>       at java.lang.reflect.Method.invoke(Method.java:498)
>       at 
> org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:50)
>       at 
> org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
>       at 
> org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:47)
>       at 
> org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)
>       at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:325)
>       at 
> org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:78)
>       at 
> org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:57)
>       at org.junit.runners.ParentRunner$3.run(ParentRunner.java:290)
>       at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:71)
>       at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:288)
>       at org.junit.runners.ParentRunner.access$000(ParentRunner.java:58)
>       at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:268)
>       at org.junit.runners.ParentRunner.run(ParentRunner.java:363)
>       at 
> org.apache.maven.surefire.junit4.JUnit4Provider.execute(JUnit4Provider.java:365)
>       at 
> org.apache.maven.surefire.junit4.JUnit4Provider.executeWithRerun(JUnit4Provider.java:273)
>       at 
> org.apache.maven.surefire.junit4.JUnit4Provider.executeTestSet(JUnit4Provider.java:238)
>       at 
> org.apache.maven.surefire.junit4.JUnit4Provider.invoke(JUnit4Provider.java:159)
>       at 
> org.apache.maven.surefire.booter.ForkedBooter.invokeProviderInSameClassLoader(ForkedBooter.java:384)
>       at 
> org.apache.maven.surefire.booter.ForkedBooter.runSuitesInProcess(ForkedBooter.java:345)
>       at 
> org.apache.maven.surefire.booter.ForkedBooter.execute(ForkedBooter.java:126)
>       at 
> org.apache.maven.surefire.booter.ForkedBooter.main(ForkedBooter.java:418)
> {code}
> This happens when AsyncDispatcher is not initialized in the testcases and so 
> detailsInterval is taken as 0.



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