Ming Ma updated YARN-2050:

    Attachment: YARN-2050.patch

Papreduce CLI and yarn CLI pass the configuration to LogCLIHelpers. 
LogCLIHelpers use the same configuration to create remoteRootLogDir and 
remoteAppLogDir, etc. in dumpAllContainersLogs. The fix is to use the same 
configuration to create FileContext.

To follow up on [~jlowe]'s comments,

1. remoteAppLogDir.toUri().getScheme() returns null and 
AbstractFileSystem.createFileSystem doesn't like it if dumpAllContainersLogs 
calls FileContext.getFileContext(remoteAppLogDir.toUri()).

2. If caller of LogCLIHelpers doesn't setConf ahead of time, 
dumpAllContainersLogs will get null pointer exception when it tries to get 

> Fix LogCLIHelpers to create the correct FileContext
> ---------------------------------------------------
>                 Key: YARN-2050
>                 URL: https://issues.apache.org/jira/browse/YARN-2050
>             Project: Hadoop YARN
>          Issue Type: Bug
>            Reporter: Ming Ma
>            Assignee: Ming Ma
>         Attachments: YARN-2050.patch
> LogCLIHelpers calls FileContext.getFileContext() without any parameters. Thus 
> the FileContext created isn't necessarily the FileContext for remote log.

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