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Date: Mon, 14 Mar 2011 02:47:29 +0000 (UTC)
From: "Konstantin Shvachko (JIRA)" <jira@apache.org>
To: hdfs-issues@hadoop.apache.org
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Subject: [jira] Updated: (HDFS-1521) Persist transaction ID on disk between
 NN restarts
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     [ https://issues.apache.org/jira/browse/HDFS-1521?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Konstantin Shvachko updated HDFS-1521:
--------------------------------------

    Attachment: FSImageFormat.patch

Attaching a diff for FSImageFormat only. Let's make sure imgVersion in the image file and layoutVersion in VERSION file are the same and then use the latter. This lets us avoid passing imgVersion to several methods, and clarifies that imgVersion in the image is nothing but a redundant field.

The rest looks good. +1

> 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-1521.3.txt, hdfs-1521.4.txt, hdfs-1521.5.txt, hdfs-1521.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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