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https://issues.apache.org/jira/browse/HDFS-1073?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12918102#action_12918102
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Sanjay Radia commented on HDFS-1073:
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> So are you suggesting that each edit will include a header with the
> transaction ID in it? ..
Actually I was, but your suggestion works.
However, having a txid in each record helps sanity checks and debugging. There
have been cases where we have got the transactions reversed in the past.
The main cost is reading the extra 8 bytes and de-serializing the number.
(BTW zookeeper does put in the txid in each editlog record).
> 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
> Assignee: Todd Lipcon
> Attachments: hdfs1073.pdf
>
>
> 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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