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Posted to common-dev@hadoop.apache.org by "Konstantin Shvachko (JIRA)" <ji...@apache.org> on 2009/01/16 23:27:59 UTC

[jira] Created: (HADOOP-5074) Consistency of different replicas of the same block is not checked.

Consistency of different replicas of the same block is not checked.
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                 Key: HADOOP-5074
                 URL: https://issues.apache.org/jira/browse/HADOOP-5074
             Project: Hadoop Core
          Issue Type: Bug
          Components: dfs
    Affects Versions: 0.14.0
            Reporter: Konstantin Shvachko


HDFS currently detects corrupted replicas by verifying that its contents matches the checksum stored in the block meta-file. This is done independently for each replica of the block on the data-node it belongs to. But we do not check that the replicas are identical across data-nodes as long as they have the same size.
This is not common but can happen as a result of a software bug or an operator mismanagement. And in this case different clients will read different data from the same file.

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