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https://issues.apache.org/jira/browse/HDFS-2971?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13213932#comment-13213932
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Eli Collins commented on HDFS-2971:
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Suresh,
The highest gen stamp in an image or log tells you if it's older than another
file system. You don't want to update to saved image/logs that are old as that
can cause data loss (you start the NN and it starts removing blocks with a new
GS).
Thanks,
Eli
> some improvements to the manual NN metadata recovery tools
> ----------------------------------------------------------
>
> Key: HDFS-2971
> URL: https://issues.apache.org/jira/browse/HDFS-2971
> Project: Hadoop HDFS
> Issue Type: Improvement
> Components: libhdfs
> Reporter: Colin Patrick McCabe
> Assignee: Colin Patrick McCabe
> Attachments: 2012-02-17_0001-OEV-enhancements-pt.-2.patch,
> HDFS-2971__print_highest_generation_stamp.txt
>
>
> Some improvements to the manual NN metadata recovery tools.
> Specifically, we want the Offline Edit Viewer (oev) tool to prints out the
> highest generation stamp that was encountered when processing the edit log.
> We also want OEV to look for large gaps in the generation stamp, as these can
> indicate corruption. The minimum gap to look for should be configurable with
> -G or --genStampGap.
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