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Date: Fri, 29 Apr 2011 06:21:03 +0000 (UTC)
From: "Todd Lipcon (JIRA)" <jira@apache.org>
To: hdfs-issues@hadoop.apache.org
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Subject: [jira] [Updated] (HDFS-1801) Remove use of timestamps to identify
 checkpoints and logs
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     [ https://issues.apache.org/jira/browse/HDFS-1801?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Todd Lipcon updated HDFS-1801:
------------------------------

    Attachment: hdfs-1801.txt

New patch includes the new file that makes little checkpoints of the txid

> Remove use of timestamps to identify checkpoints and logs
> ---------------------------------------------------------
>
>                 Key: HDFS-1801
>                 URL: https://issues.apache.org/jira/browse/HDFS-1801
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>          Components: name-node
>    Affects Versions: Edit log branch (HDFS-1073)
>            Reporter: Todd Lipcon
>            Assignee: Todd Lipcon
>             Fix For: Edit log branch (HDFS-1073)
>
>         Attachments: hdfs-1801.txt, hdfs-1801.txt, hdfs-1801.txt
>
>
> Currently, the NameNode validates checkpoint uploads by using timestamps associated with checkpoints and edit logs. However, now that we have transaction IDs that uniquely identify each point in time in the history of a namespace, it is more robust to simply use transaction IDs to identify images and edits.
> This JIRA is to remove the use of editsTime and checkpointTime and replace it with:
> * {{lastCheckpointTxId}} - the highest transaction ID reflected in the most recently saved fsimage file
> * {{lastLogRollTxId}} - the highest transaction ID in {{edits}} when {{rollFsImage}} was called by the checkpointing node.

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