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From "Colin Patrick McCabe (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HDFS-5762) BlockReaderLocal doesn't return -1 on EOF when doing zero-length reads
Date Tue, 14 Jan 2014 00:56:50 GMT
Colin Patrick McCabe created HDFS-5762:
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             Summary: 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


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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