[jira] Commented: (HADOOP-6614) RunJar should provide more diags when it can't create a temp file

["Todd Lipcon (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/HADOOP-6614?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12841446#action_12841446 ] 

Todd Lipcon commented on HADOOP-6614:
-------------------------------------

+1 to this idea. I've seen this come up on the mailing list pretty often - a clear message pointing them to the config hadoop.tmp.dir and the current setting would be helpful.

> RunJar should provide more diags when it can't create a temp file
> -----------------------------------------------------------------
>
>                 Key: HADOOP-6614
>                 URL: https://issues.apache.org/jira/browse/HADOOP-6614
>             Project: Hadoop Common
>          Issue Type: Improvement
>          Components: util
>    Affects Versions: 0.22.0
>            Reporter: Steve Loughran
>            Priority: Minor
>
> When you see a stack trace about permissions, it is better if the trace included the file/directory at fault:
> {code}
> Exception in thread "main" java.io.IOException: Permission denied
> 	at java.io.UnixFileSystem.createFileExclusively(Native Method)
> 	at java.io.File.checkAndCreate(File.java:1704)
> 	at java.io.File.createTempFile(File.java:1792)
> 	at org.apache.hadoop.util.RunJar.main(RunJar.java:147)
> {code}
> As it is, you need to go into the code, discover that it's {{${hadoop.tmp.dir}/hadoop-unjar}}, but you need to know the value of hadoop.tmp.dir to really find out what the problem is.

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