[HDFS-5762] BlockReaderLocal doesn't return -1 on EOF when doing zero-length reads

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 2.3.0
• Fix Version/s: 2.3.0
• Assignee: Colin McCabe
• Reporter: Colin McCabe
• Created: 14/Jan/14 00:55
• Updated: 06/Mar/14 23:33
• Resolved: 15/Jan/14 19:20

Description

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.

Issue Links

• relates to: HDFS-6071 BlockReaderLocal doesn't return -1 on EOF when doing a zero-length read on a short file