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From "Colin Patrick McCabe (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-7744) Fix potential NPE in DFSInputStream after setDropBehind or setReadahead is called
Date Tue, 10 Feb 2015 04:20:34 GMT

    [ https://issues.apache.org/jira/browse/HDFS-7744?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14313526#comment-14313526
] 

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

committed to 2.7.  thanks, Akira!

> 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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