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https://issues.apache.org/jira/browse/HDFS-2872?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Colin Patrick McCabe updated HDFS-2872:
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Attachment: (was: HDFS-2872-branch-1.patch)
> 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-branch-1.patch, 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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