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Date: Tue, 10 Feb 2015 04:15:35 +0000 (UTC)
From: "Colin Patrick McCabe (JIRA)" <jira@apache.org>
To: hdfs-issues@hadoop.apache.org
Message-ID: <JIRA.12773105.1423254883000.309020.1423541735160@Atlassian.JIRA>
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 <JIRA.12773105.1423254883056@arcas>
Subject: [jira] [Commented] (HDFS-7744) Fix potential NPE in DFSInputStream
 after setDropBehind or setReadahead is called
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    [ https://issues.apache.org/jira/browse/HDFS-7744?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14313516#comment-14313516 ] 

Colin Patrick McCabe commented on HDFS-7744:
--------------------------------------------

Findbugs warning is unrelated (it is about BackupImage, which wasn't changed in this patch).

> 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, 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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