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Posted to hdfs-dev@hadoop.apache.org by "Eli Collins (Resolved) (JIRA)" <ji...@apache.org> on 2012/03/07 19:18:58 UTC
[jira] [Resolved] (HDFS-2872) Add sanity checks during edits
loading that generation stamps are non-decreasing
[ https://issues.apache.org/jira/browse/HDFS-2872?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Eli Collins resolved HDFS-2872.
-------------------------------
Resolution: Fixed
Hadoop Flags: Reviewed
I've committed this. Thanks Colin!
> 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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