RAID block fixer should prioritize block fix operations
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Key: MAPREDUCE-2436
URL: https://issues.apache.org/jira/browse/MAPREDUCE-2436
Project: Hadoop Map/Reduce
Issue Type: Improvement
Components: contrib/raid
Affects Versions: 0.20.2, 0.20.3
Reporter: Ramkumar Vadali
Assignee: Ramkumar Vadali
The RAID block fixer submits mapreduce jobs to fix corrupt files. This is OK
for XOR RAID, but with Reed-Solomon RAID, there can be large number of corrupt
files when even a single datanode goes dead. With Reed-SOlomon RAID, it is
better to categorize corrupt files based on urgency. Files with only one
corrupt block can be treated as lower priority than those with more number of
corrupt blocks.
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