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From "Hudson (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-4156) Seeking to a negative position should throw an IOE
Date Sun, 18 Nov 2012 13:07:01 GMT

    [ https://issues.apache.org/jira/browse/HDFS-4156?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13499794#comment-13499794
] 

Hudson commented on HDFS-4156:
------------------------------

Integrated in Hadoop-Hdfs-trunk #1230 (See [https://builds.apache.org/job/Hadoop-Hdfs-trunk/1230/])
    HDFS-4156. Seeking to a negative position should throw an IOE. Contributed by Eli Reisman
(Revision 1410812)

     Result = SUCCESS
eli : http://svn.apache.org/viewcvs.cgi/?root=Apache-SVN&view=rev&rev=1410812
Files : 
* /hadoop/common/trunk/hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt
* /hadoop/common/trunk/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/DFSInputStream.java
* /hadoop/common/trunk/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/TestSeekBug.java

                
> Seeking to a negative position should throw an IOE
> --------------------------------------------------
>
>                 Key: HDFS-4156
>                 URL: https://issues.apache.org/jira/browse/HDFS-4156
>             Project: Hadoop HDFS
>          Issue Type: Bug
>    Affects Versions: 1.0.0, 2.0.0-alpha
>            Reporter: Eli Collins
>            Assignee: Eli Reisman
>              Labels: newbie
>             Fix For: 2.0.3-alpha
>
>         Attachments: HDFS-4156-1.patch, HDFS-4156-2.patch, HDFS-4156-3.patch, HDFS-4156-4.patch
>
>
> Credit to [~vanzin] for finding this. If you seek() to a position before the start of
the file, the seek() call succeeds, and the following read() call throws an NPE. A more friendly
approach would be to fail the seek() call.
> {noformat}
> Exception in thread "main" java.lang.NullPointerException
> at org.apache.hadoop.hdfs.DFSInputStream.readWithStrategy(DFSInputStream.java:670)
> at org.apache.hadoop.hdfs.DFSInputStream.read(DFSInputStream.java:685)
> at java.io.DataInputStream.read(DataInputStream.java:83)
> at fstest.main(fstest.java:12)
> {noformat}

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