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From "Hadoop QA (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-1934) Fix NullPointerException when certain File APIs return null
Date Fri, 27 May 2011 08:47:47 GMT

    [ https://issues.apache.org/jira/browse/HDFS-1934?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13040134#comment-13040134

Hadoop QA commented on HDFS-1934:

-1 overall.  Here are the results of testing the latest attachment 
  against trunk revision 1128009.

    +1 @author.  The patch does not contain any @author tags.

    -1 tests included.  The patch doesn't appear to include any new or modified tests.
                        Please justify why no new tests are needed for this patch.
                        Also please list what manual steps were performed to verify this patch.

    +1 javadoc.  The javadoc tool did not generate any warning messages.

    +1 javac.  The applied patch does not increase the total number of javac compiler warnings.

    +1 findbugs.  The patch does not introduce any new Findbugs (version 1.3.9) warnings.

    +1 release audit.  The applied patch does not increase the total number of release audit

    +1 core tests.  The patch passed core unit tests.

    +1 contrib tests.  The patch passed contrib unit tests.

    +1 system test framework.  The patch passed system test framework compile.

Test results: https://builds.apache.org/hudson/job/PreCommit-HDFS-Build/642//testReport/
Findbugs warnings: https://builds.apache.org/hudson/job/PreCommit-HDFS-Build/642//artifact/trunk/build/test/findbugs/newPatchFindbugsWarnings.html
Console output: https://builds.apache.org/hudson/job/PreCommit-HDFS-Build/642//console

This message is automatically generated.

> Fix NullPointerException when certain File APIs return null
> -----------------------------------------------------------
>                 Key: HDFS-1934
>                 URL: https://issues.apache.org/jira/browse/HDFS-1934
>             Project: Hadoop HDFS
>          Issue Type: Bug
>    Affects Versions: 0.23.0
>            Reporter: Bharath Mundlapudi
>            Assignee: Bharath Mundlapudi
>             Fix For: 0.23.0
>         Attachments: HDFS-1934-1.patch, HDFS-1934-2.patch, HDFS-1934-3.patch
> While testing Disk Fail Inplace, We encountered the NPE from this part of the code. 
> File[] files = dir.listFiles();
> for (File f : files) {
> ...
> }
> This is kinda of an API issue. When a disk is bad (or name is not a directory), this
API (listFiles, list) return null rather than throwing an exception. This 'for loop' throws
a NPE exception. And same applies to dir.list() API.
> Fix all the places where null condition was not checked.

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