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https://issues.apache.org/jira/browse/HDFS-1521?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Todd Lipcon updated HDFS-1521:
------------------------------

    Attachment: hdfs-1521.4.txt

New version addresses the TODOs, removes a couple places I had put unrelated 
notes to myself, and adds an explicit initialization of 
BackupStorage#lastAppliedTxId (per review comment by Sanjay offline)

Will rerun unit tests just to be safe.

> Persist transaction ID on disk between NN restarts
> --------------------------------------------------
>
>                 Key: HDFS-1521
>                 URL: https://issues.apache.org/jira/browse/HDFS-1521
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>    Affects Versions: 0.22.0
>            Reporter: Todd Lipcon
>            Assignee: Todd Lipcon
>             Fix For: 0.22.0
>
>         Attachments: hdfs-1521.3.txt, hdfs-1521.4.txt, hdfs-1521.txt, 
> hdfs-1521.txt
>
>
> For HDFS-1073 and other future work, we'd like to have the concept of a 
> transaction ID that is persisted on disk with the image/edits. We already 
> have this concept in the NameNode but it resets to 0 on restart. We can also 
> use this txid to replace the _checkpointTime_ field, I believe.

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