[HADOOP-8703] distcpV2: turn CRC checking off for 0 byte size

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 0.23.3
• Fix Version/s: 0.23.3, 2.0.2-alpha
• Release Note: distcp skips CRC on 0 byte files.
• Assignee: Dave Thompson Assign to me
• Reporter: Dave Thompson
• Due: 15/Aug/12
• Created: 15/Aug/12 15:21
• Updated: 11/Oct/12 17:45
• Resolved: 15/Aug/12 19:20

Description

DistcpV2 (hadoop-tools/hadoop-distcp/..) can fail from checksum failure, sometimes when copying a 0 byte file. Root cause of this may have to do with an inconsistent nature of HDFS when creating 0 byte files, however distcp can avoid this issue by not checking CRC when size is zero.

This issue was reported as part of HADOOP-8233, though it seems like a better idea to treat this particular aspect on it's own.