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Posted to hdfs-issues@hadoop.apache.org by "Ivan Kelly (JIRA)" <ji...@apache.org> on 2011/02/15 18:21:58 UTC

[jira] Commented: (HDFS-1521) Persist transaction ID on disk between NN restarts

    [ https://issues.apache.org/jira/browse/HDFS-1521?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12994887#comment-12994887 ] 

Ivan Kelly commented on HDFS-1521:
----------------------------------

Has this feature been put on ice, or is it waiting for some other JIRA to go in?

> 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
>          Components: name-node
>    Affects Versions: 0.22.0
>            Reporter: Todd Lipcon
>            Assignee: Todd Lipcon
>         Attachments: hdfs-1521.3.txt, hdfs-1521.4.txt, hdfs-1521.5.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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