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Date: Sat, 8 Mar 2014 21:03:42 +0000 (UTC)
From: "Colin Patrick McCabe (JIRA)" <jira@apache.org>
To: hdfs-issues@hadoop.apache.org
Message-ID: <JIRA.12699288.1394148057270.30549.1394312622974@arcas>
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References: <JIRA.12699288.1394148057270@arcas>
Subject: [jira] [Updated] (HDFS-6071) BlockReaderLocal doesn't return -1 on
 EOF when doing a zero-length read on a short file
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     [ https://issues.apache.org/jira/browse/HDFS-6071?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Colin Patrick McCabe updated HDFS-6071:
---------------------------------------

    Attachment: HDFS-6071.002.patch

> BlockReaderLocal doesn't return -1 on EOF when doing a zero-length read on a short file
> ---------------------------------------------------------------------------------------
>
>                 Key: HDFS-6071
>                 URL: https://issues.apache.org/jira/browse/HDFS-6071
>             Project: Hadoop HDFS
>          Issue Type: Bug
>    Affects Versions: 2.4.0
>            Reporter: Colin Patrick McCabe
>            Assignee: Colin Patrick McCabe
>         Attachments: HDFS-6071.001.patch, HDFS-6071.002.patch
>
>
> BlockReaderLocal doesn't return -1 on EOF when doing a zero-length read on a short file.  Specifically, if the file is shorter than the readahead buffer, or if the position is nearer to the end than the length of the readahead buffer, this may happen.  This is mainly a concern because libhdfs relies on this to determine whether it should use direct reads.


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