Raid should store the metadata in HDFS
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Key: MAPREDUCE-1837
URL: https://issues.apache.org/jira/browse/MAPREDUCE-1837
Project: Hadoop Map/Reduce
Issue Type: Improvement
Components: contrib/raid
Affects Versions: 0.22.0
Reporter: Scott Chen
Assignee: Scott Chen
Fix For: 0.22.0
Currently if you change the stripe length in the raid policy. The existing
raided files cannot be recovered.
Also in the future if we want to upgrade to a better erasure code such as
Reed-Solomon or LDPC and change the policy for that.
The same problem will happen. We can avoid this problem if we store the
information in a metadata file.
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