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From "Aaron T. Myers (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-2872) Add sanity checks during edits loading that generation stamps are non-decreasing
Date Fri, 24 Feb 2012 15:12:54 GMT

    [ https://issues.apache.org/jira/browse/HDFS-2872?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13215663#comment-13215663
] 

Aaron T. Myers commented on HDFS-2872:
--------------------------------------

Hey Colin, it looks like the patch you posted is against trunk, and not branch-1.
                
> Add sanity checks during edits loading that generation stamps are non-decreasing
> --------------------------------------------------------------------------------
>
>                 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
>            Assignee: Colin Patrick McCabe
>         Attachments: HDFS-2872.patch
>
>
> 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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