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Posted to common-issues@hadoop.apache.org by "Steve Loughran (JIRA)" <ji...@apache.org> on 2014/11/08 22:36:34 UTC

[jira] [Commented] (HADOOP-11285) FileUtil operations don't check for native lib loaded on windows; fails with NPE

    [ https://issues.apache.org/jira/browse/HADOOP-11285?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14203602#comment-14203602 ] 

Steve Loughran commented on HADOOP-11285:
-----------------------------------------

MAPREDUCE-5451 is an example of the current stack trace

> FileUtil operations don't check for native lib loaded on windows; fails with NPE
> --------------------------------------------------------------------------------
>
>                 Key: HADOOP-11285
>                 URL: https://issues.apache.org/jira/browse/HADOOP-11285
>             Project: Hadoop Common
>          Issue Type: Bug
>          Components: util
>    Affects Versions: 2.6.0
>         Environment: windows
>            Reporter: Steve Loughran
>
> On windows {{FileUtil.canRead()}} and the like requires the native APIs (at least until a migration to java 7 APIs). The methods do not, however, call  {{NativeIO.isAvailable()}} to verify the native libs are there. As a result, the calls fail with less useful stack traces. 
> if Java 7 allows all of these calls to be replaced, then this is a non-issue
> If not, I propose some {{verifyAvailableOnWindows()}} method which triggers an exception; one which includes some hints about the problem —perhaps a URL to a wiki page on the topic



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