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From "dhruba borthakur (JIRA)" <j...@apache.org>
Subject [jira] Created: (HADOOP-1557) Deletion of excess replicas should prefer to delete corrupted replicas before deleting valid replicas
Date Mon, 02 Jul 2007 07:15:04 GMT
Deletion of excess replicas should prefer to delete corrupted replicas before deleting valid
replicas
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                 Key: HADOOP-1557
                 URL: https://issues.apache.org/jira/browse/HADOOP-1557
             Project: Hadoop
          Issue Type: Bug
          Components: dfs
            Reporter: dhruba borthakur


Suppose a block has three replicas and two of the replicas are corrupted. If the replication
factor of the file is reduced to 2. The filesystem should preferably delete the two corrupted
replicas, otherwise it could lead to a corrupted file.

One option would be to make the datanode periodically validate all blocks with their corresponding
CRCs. The other option would be to make the setReplication call validate existing replicas
before deleting excess replicas.

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