[MAPREDUCE-2150] RaidNode should periodically fix corrupt blocks

• Type: Improvement
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 0.22.0
• Component/s: contrib/raid
• Hadoop Flags: Reviewed
• Assignee: Ramkumar Vadali
• Reporter: Ramkumar Vadali
• Created: 25/Oct/10 20:42
• Updated: 02/May/13 02:29
• Resolved: 29/Oct/10 01:25

Description

(Recreating HDFS-1171 since RAID is in mapreduce)

RaidNode currently does not fix missing blocks. The missing blocks have to be fixed using RaidShell.
This task proposes that recovery be more automated:
1. RaidNode periodically fetches a list of corrupt files from the NameNode
2. If the corrupt files can be fixed using RAID, it should generate the block.
3. Choose a datanode and send the block contents along with checksum to the datanode.

Issue Links

• is depended upon by: MAPREDUCE-2155 RaidNode should optionally dispatch map reduce jobs to fix corrupt blocks (instead of fixing locally)