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From "Todd Lipcon (JIRA)" <j...@apache.org>
Subject [jira] Created: (HDFS-1103) Replica recovery doesn't distinguish between flushed-but-corrupted last chunk and unflushed last chunk
Date Wed, 21 Apr 2010 19:17:50 GMT
Replica recovery doesn't distinguish between flushed-but-corrupted last chunk and unflushed
last chunk
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                 Key: HDFS-1103
                 URL: https://issues.apache.org/jira/browse/HDFS-1103
             Project: Hadoop HDFS
          Issue Type: Bug
          Components: data-node
    Affects Versions: 0.21.0, 0.22.0
            Reporter: Todd Lipcon


When the DN creates a replica under recovery, it calls validateIntegrity, which truncates
the last checksum chunk off of a replica if it is found to be invalid. Then when the block
recovery process happens, this shortened block wins over a longer replica from another node
where there was no corruption. Thus, if just one of the DNs has an invalid last checksum chunk,
data that has been sync()ed to other datanodes can be lost.

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