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From "Todd Lipcon (Created) (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HDFS-2872) Add sanity checks during edits loading that generation stamps are non-decreasing
Date Wed, 01 Feb 2012 19:38:58 GMT
Add sanity checks during edits loading that generation stamps are non-decreasing
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                 Key: HDFS-2872
                 URL: https://issues.apache.org/jira/browse/HDFS-2872
             Project: Hadoop HDFS
          Issue Type: Improvement
          Components: name-node
    Affects Versions: 1.0.0
            Reporter: Todd Lipcon


In 0.23 and later versions, we have a txid per edit, and the loading process verifies that
there are no gaps. Lacking this in 1.0, we can use generation stamps as a proxy - the OP_SET_GENERATION_STAMP
opcode should never result in a decreased genstamp. If it does, that would indicate that the
edits are corrupt, or older edits are being applied to a newer checkpoint, for example.

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