[MAPREDUCE-2570] Bug in RAID FS (DistributedRaidFileSystem) unraid path

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Won't Fix
• Component/s: contrib/raid
• Assignee: Ramkumar Vadali
• Reporter: Ramkumar Vadali
• Created: 06/Jun/11 20:17
• Updated: 01/Aug/17 17:12
• Resolved: 01/Aug/17 17:12

Description

The "un-raid" path in DistributedRaidFileSystem goes through RaidNode.unRaidCorruptBlock(), which has a bug when the parity file is inside a HAR. The temporary file that contains the recovered block contents is created in the filesystem that hosts the parity file. In case the parity file is inside a HAR, its filesystem is HarFileSystem, which is read-only. In this case the temporary file creation will fail. The fix is a one-line change to use the underlying filesystem of the HAR.