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From "Ivan Kelly (JIRA)" <j...@apache.org>
Subject [jira] Updated: (HDFS-1521) Persist transaction ID on disk between NN restarts
Date Mon, 14 Mar 2011 11:37:29 GMT

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

Ivan Kelly updated HDFS-1521:

    Attachment: HDFS-1521.diff

Merged shv's changes with the main patch. One minor change, in that storage is now passed
to FSImageFormat directly so that getImageVersion doesn't have to reach back around namesystem.getImage().getStorage
to get the version.

> 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: FSImageFormat.patch, HDFS-1521.diff, HDFS-1521.diff, HDFS-1521.diff,
HDFS-1521.diff, 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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