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From "Todd Lipcon (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HDFS-4618) default for checkpoint txn interval is too low
Date Wed, 20 Mar 2013 06:07:15 GMT

     [ https://issues.apache.org/jira/browse/HDFS-4618?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Todd Lipcon updated HDFS-4618:
------------------------------

    Status: Patch Available  (was: Open)
    
> default for checkpoint txn interval is too low
> ----------------------------------------------
>
>                 Key: HDFS-4618
>                 URL: https://issues.apache.org/jira/browse/HDFS-4618
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: namenode
>    Affects Versions: 2.0.4-alpha
>            Reporter: Todd Lipcon
>            Assignee: Todd Lipcon
>         Attachments: hdfs-4618.txt
>
>
> The default checkpoint interval is currently set to 40k transactions. That's way too
low (I don't know what idiot set it to that.. oh wait, it was me...)
> The old default in 1.0 is 64MB. Assuming an average of 100 bytes per txn, we should have
the txn-count based interval default to at least 640,000. I'd like to change to 1M as a nice
round number.

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