[HDFS-3054] distcp -skipcrccheck has no effect

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 0.23.2, 2.0.0-alpha, 2.0.1-alpha, 2.0.2-alpha
• Fix Version/s: 2.0.2-alpha
• Component/s: tools
• Target Version/s: 2.0.0-alpha, 2.0.1-alpha, 2.0.2-alpha
• Hadoop Flags: Reviewed
• Assignee: Colin McCabe
• Reporter: patrick white
• Created: 06/Mar/12 19:12
• Updated: 04/Sep/14 00:59
• Resolved: 05/Sep/12 18:55

Description

Using distcp with '-skipcrccheck' still seems to cause CRC checksums to happen.

Ran into this while debugging an issue associated with source and destination having different blocksizes, and not using the preserve blocksize parameter (-pb). In both 23.1 and 23.2 builds, trying to bypass the checksum verification by using the '-skipcrcrcheck' parameter had no effect, the distcp still failed on checksum errors.

Test scenario to reproduce;
do not use '-pb' and try a distcp from 20.205 (default blksize=128M) to .23 (default blksize=256M), the distcp fails on checksum errors, which is expected due to checksum calculation (tiered aggregation of all blks). Trying the same distcp only providing '-skipcrccheck' still fails with the same checksum error, it is expected that checksum would now be bypassed and the distcp would proceed.

Issue Links

• is related to: HDFS-3889 distcp overwrites files even when there are missing checksums
• is related to: MAPREDUCE-4654 TestDistCp is @ignored
• is related to: HADOOP-8060 Add a capability to discover and set checksum types per file.