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From "Hairong Kuang (JIRA)" <j...@apache.org>
Subject [jira] Created: (HDFS-875) NameNode incorretly handles corrupt replicas
Date Wed, 06 Jan 2010 22:22:54 GMT
NameNode incorretly handles corrupt replicas
--------------------------------------------

                 Key: HDFS-875
                 URL: https://issues.apache.org/jira/browse/HDFS-875
             Project: Hadoop HDFS
          Issue Type: Bug
          Components: name-node
    Affects Versions: 0.21.0, 0.22.0
            Reporter: Hairong Kuang
             Fix For: 0.21.0, 0.22.0


I reviewed how NameNode handles corrupt replicas as part of work on HDFS-145. Comparing to
releases prior to 0.21, NameNode now does a good job identifying corrupt replicas, but it
seems to me there are two flaws how it handles the corrupt replicas:
1. NameNode does not add corrupt replicas to the block locations as what NameNode does before;
2. If the corruption is caused by generation stamp mismatch or state mismatch, the wrong GS
and state do not get put in corruptReplicasMap. Therefore it may lead to the deletion of the
wrong replica. 

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