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https://issues.apache.org/jira/browse/HDFS-7744?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14313540#comment-14313540
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Hudson commented on HDFS-7744:
------------------------------
FAILURE: Integrated in Hadoop-trunk-Commit #7057 (See
[https://builds.apache.org/job/Hadoop-trunk-Commit/7057/])
HDFS-7744. Fix potential NPE in DFSInputStream after setDropBehind or
setReadahead is called (cmccabe) (cmccabe: rev
a9dc5cd7069f721e8c55794b877026ba02537167)
*
hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/datanode/TestCachingStrategy.java
* hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt
*
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/DFSInputStream.java
> 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
> Fix For: 2.7.0
>
> Attachments: HDFS-7744.001.patch, HDFS-7744.002.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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