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https://issues.apache.org/jira/browse/YARN-10849?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Szilard Nemeth updated YARN-10849:
----------------------------------
    Attachment: YARN-10849.002.patch

> Clarify testcase documentation for 
> TestServiceAM#testContainersReleasedWhenPreLaunchFails
> -----------------------------------------------------------------------------------------
>
>                 Key: YARN-10849
>                 URL: https://issues.apache.org/jira/browse/YARN-10849
>             Project: Hadoop YARN
>          Issue Type: Improvement
>            Reporter: Szilard Nemeth
>            Assignee: Szilard Nemeth
>            Priority: Minor
>         Attachments: YARN-10849.001.patch, YARN-10849.002.patch
>
>
> There's a small comment added to testcase: 
> org.apache.hadoop.yarn.service.TestServiceAM#testContainersReleasedWhenPreLaunchFails:
> {code}
>   // Test to verify that the containers are released and the
>   // component instance is added to the pending queue when building the launch
>   // context fails.
> {code}
> However, it was not clear for me why the "launch context" would fail.
> While the test passes, it throws an Exception that tells the story. 
> {code}
> 2021-07-06 18:31:04,438 ERROR [pool-275-thread-1] 
> containerlaunch.ContainerLaunchService (ContainerLaunchService.java:run(122)) 
> - [COMPINSTANCE compa-0 : container_1625589063422_0001_01_000001]: Failed to 
> launch container.
> java.lang.IllegalArgumentException: Can not create a Path from a null string
>       at org.apache.hadoop.fs.Path.checkPathArg(Path.java:164)
>       at org.apache.hadoop.fs.Path.<init>(Path.java:180)
>       at 
> org.apache.hadoop.yarn.service.provider.tarball.TarballProviderService.processArtifact(TarballProviderService.java:39)
>       at 
> org.apache.hadoop.yarn.service.provider.AbstractProviderService.buildContainerLaunchContext(AbstractProviderService.java:144)
>       at 
> org.apache.hadoop.yarn.service.containerlaunch.ContainerLaunchService$ContainerLauncher.run(ContainerLaunchService.java:107)
>       at 
> java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
>       at 
> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
>       at java.lang.Thread.run(Thread.java:748)
> {code}
> This exception is thrown because the id of the Artifact object is unset 
> (null) and TarballProviderService.processArtifact verifies it and it does not 
> allow such artifacts.
> The aim of this jira is to add a clarification comment or javadoc to this 
> method.



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