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