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Posted to mapreduce-dev@hadoop.apache.org by "Scott Chen (JIRA)" <ji...@apache.org> on 2010/06/02 22:08:28 UTC

[jira] Created: (MAPREDUCE-1837) Raid should store the metadata in HDFS

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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