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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