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Date: Mon, 4 Jul 2011 22:45:21 +0000 (UTC)
From: "Todd Lipcon (JIRA)" <jira@apache.org>
To: hdfs-issues@hadoop.apache.org
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Subject: [jira] [Updated] (HDFS-2123) 1073: Checkpoint interval should be
 based on txn count, not size
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     [ https://issues.apache.org/jira/browse/HDFS-2123?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Todd Lipcon updated HDFS-2123:
------------------------------

    Attachment: hdfs-2123.txt

New patch issues a warning like this:

11/07/04 15:42:18 WARN namenode.SecondaryNameNode: Configuration key dfs.namenode.checkpoint.size is deprecated! Ignoring... Instead please specify a value for dfs.namenode.checkpoint.txns

I will check this into the branch based on dhruba's earlier +1. If there's any further review, let me know and I'll address it.

> 1073: Checkpoint interval should be based on txn count, not size
> ----------------------------------------------------------------
>
>                 Key: HDFS-2123
>                 URL: https://issues.apache.org/jira/browse/HDFS-2123
>             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-2123.txt, hdfs-2123.txt
>
>
> Currently, the administrator can configure the secondary namenode to checkpoint either every N seconds, or every N bytes worth of edit log. It would make more sense to get rid of the size-based interval and instead allow the administrator to specify checkpoints every N transactions. This also simplifies the code a little bit.

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