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Date: Tue, 22 Mar 2011 16:17:05 +0000 (UTC)
From: "Ivan Kelly (JIRA)" <jira@apache.org>
To: hdfs-issues@hadoop.apache.org
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Subject: [jira] [Commented] (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:comment-tabpanel&focusedCommentId=13009695#comment-13009695 ] 

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

Something in HDFS-1763 is causing the new failure. Still tracking it down.

> 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
>             Fix For: 0.23.0
>
>         Attachments: FSImageFormat.patch, HDFS-1521.diff, 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, 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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