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From "Colin Patrick McCabe (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HDFS-5762) BlockReaderLocal doesn't return -1 on EOF when doing zero-length reads
Date Wed, 15 Jan 2014 19:21:33 GMT

     [ https://issues.apache.org/jira/browse/HDFS-5762?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Colin Patrick McCabe updated HDFS-5762:
---------------------------------------

       Resolution: Fixed
    Fix Version/s: 2.4.0
           Status: Resolved  (was: Patch Available)

committed to 2.4 and trunk.  Thanks, Andrew.

P.S. This bug was introduced by HDFS-5634, which was only committed to 2.4 and trunk.

> BlockReaderLocal doesn't return -1 on EOF when doing zero-length reads
> ----------------------------------------------------------------------
>
>                 Key: HDFS-5762
>                 URL: https://issues.apache.org/jira/browse/HDFS-5762
>             Project: Hadoop HDFS
>          Issue Type: Bug
>    Affects Versions: 2.4.0
>            Reporter: Colin Patrick McCabe
>            Assignee: Colin Patrick McCabe
>             Fix For: 2.4.0
>
>         Attachments: HDFS-5762.001.patch, HDFS-5762.002.patch
>
>
> Unlike the other block readers, BlockReaderLocal currently doesn't return -1 on EOF when
doing zero-length reads.  This behavior, in turn, propagates to the DFSInputStream.  BlockReaderLocal
should do this, so that client can determine whether the file is at an end by doing a zero-length
read and checking for -1.
> One place this shows up is in libhdfs, which does such a 0-length read to determine if
direct (i.e., ByteBuffer) reads are supported.



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