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From "Robert Chansler (JIRA)" <j...@apache.org>
Subject [jira] Created: (HADOOP-4004) NameNode should not serve up a bad edits log
Date Fri, 22 Aug 2008 20:24:44 GMT
NameNode should not serve up a bad edits log
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                 Key: HADOOP-4004
                 URL: https://issues.apache.org/jira/browse/HADOOP-4004
             Project: Hadoop Core
          Issue Type: Bug
    Affects Versions: 0.17.1
            Reporter: Robert Chansler


A NameNode disk failure (apparently) resulted in the NameNode serving a bad edits log to the
Secondary NameNode. The SNN observed the problem (good!), but had no alternative but to ask
again for the log, and again get the same bad replica.

1. The NN could/should have observed the same fault as the SNN.
2. If a replica is known to be bad, the NN should serve a different replica, if available.
3. The SNN should have a way to report replica failure to the NN.

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