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From "Hadoop QA (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-7744) Fix potential NPE in DFSInputStream after setDropBehind or setReadahead is called
Date Sat, 07 Feb 2015 00:14:35 GMT

    [ https://issues.apache.org/jira/browse/HDFS-7744?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14310258#comment-14310258
] 

Hadoop QA commented on HDFS-7744:
---------------------------------

{color:green}+1 overall{color}.  Here are the results of testing the latest attachment 
  http://issues.apache.org/jira/secure/attachment/12697120/HDFS-7744.001.patch
  against trunk revision 6f10434.

    {color:green}+1 @author{color}.  The patch does not contain any @author tags.

    {color:green}+1 tests included{color}.  The patch appears to include 1 new or modified
test files.

    {color:green}+1 javac{color}.  The applied patch does not increase the total number of
javac compiler warnings.

    {color:green}+1 javadoc{color}.  There were no new javadoc warning messages.

    {color:green}+1 eclipse:eclipse{color}.  The patch built with eclipse:eclipse.

    {color:green}+1 findbugs{color}.  The patch does not introduce any new Findbugs (version
2.0.3) warnings.

    {color:green}+1 release audit{color}.  The applied patch does not increase the total number
of release audit warnings.

    {color:green}+1 core tests{color}.  The patch passed unit tests in hadoop-hdfs-project/hadoop-hdfs.

Test results: https://builds.apache.org/job/PreCommit-HDFS-Build/9467//testReport/
Console output: https://builds.apache.org/job/PreCommit-HDFS-Build/9467//console

This message is automatically generated.

> Fix potential NPE in DFSInputStream after setDropBehind or setReadahead is called
> ---------------------------------------------------------------------------------
>
>                 Key: HDFS-7744
>                 URL: https://issues.apache.org/jira/browse/HDFS-7744
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: dfsclient
>    Affects Versions: 2.6.0
>            Reporter: Colin Patrick McCabe
>            Assignee: Colin Patrick McCabe
>         Attachments: HDFS-7744.001.patch
>
>
> Fix a potential NPE in DFSInputStream after setDropBehind or setReadahead is called.
 These functions clear the {{blockReader}}, but don't set {{blockEnd}} to -1, which could
lead to {{DFSInputStream#seek}} attempting to derference {{blockReader}} even though it is
{{null}}.



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