FAQ
1073: create an escape hatch to ignore startup consistency problems
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Key: HDFS-2079
URL: https://issues.apache.org/jira/browse/HDFS-2079
Project: Hadoop HDFS
Issue Type: Sub-task
Reporter: Todd Lipcon
Assignee: Todd Lipcon




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  • Colin Patrick McCabe (Resolved) (JIRA) at Feb 27, 2012 at 8:37 pm
    [ https://issues.apache.org/jira/browse/HDFS-2079?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

    Colin Patrick McCabe resolved HDFS-2079.
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    Resolution: Duplicate

    Duplicate of HDFS-3004
    1073: create an escape hatch to ignore startup consistency problems
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    Key: HDFS-2079
    URL: https://issues.apache.org/jira/browse/HDFS-2079
    Project: Hadoop HDFS
    Issue Type: Sub-task
    Components: name-node
    Affects Versions: Edit log branch (HDFS-1073)
    Reporter: Todd Lipcon
    Assignee: Colin Patrick McCabe

    In the 1073 branch, the NN is much more careful on startup to make sure it isn't missing any transactions, etc. For example, if
    one of the log segments is missing, it will refuse to start up with a message like "Expected next log group would start at txid 502 but starts at txid 516". It would be nice to provide a last-ditch escape hatch, similar to InnoDB's [force recovery modes|http://dev.mysql.com/doc/refman/5.1/en/forcing-innodb-recovery.html] to allow the operator to tell the NN to attempt to push past any such problems, with data loss expected.
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