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https://issues.apache.org/jira/browse/HDFS-4156?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Eli Reisman updated HDFS-4156:
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Attachment: HDFS-4156-2.patch
Nevermind, inspecting seek() further, I think this is all we need.
> 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
> Labels: newbie
> Attachments: HDFS-4156-1.patch, HDFS-4156-2.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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