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https://issues.apache.org/jira/browse/HDFS-1073?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12852661#action_12852661
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Sanjay Radia commented on HDFS-1073:
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Todd, Just looked at your idea. Great minds think alike. :- ) (I am sure that
most databases probably use something similar because it is a fairly obvious
solution.)
When the backup NN work was done last year, I had proposed roughly that scheme
- ie numbering the file incrementally. Rob Chanselor in our team proposed the
improvement to use the transaction id. It decouples the split (ie roll) of the
edit log and the checkpoint of the image.
At that time we didn't do it for lack of time. I think we should do this for
the next release (ie 22 ). It will simplify the code significantly and also
avoid tricky bugs.
> Simpler model for Namenode's fs Image and edit Logs
> ----------------------------------------------------
>
> Key: HDFS-1073
> URL: https://issues.apache.org/jira/browse/HDFS-1073
> Project: Hadoop HDFS
> Issue Type: Improvement
> Reporter: Sanjay Radia
>
> The naming and handling of NN's fsImage and edit logs can be significantly
> improved resulting simpler and more robust code.
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