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From "Hudson (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-4618) default for checkpoint txn interval is too low
Date Fri, 29 Mar 2013 10:41:33 GMT

    [ https://issues.apache.org/jira/browse/HDFS-4618?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13617234#comment-13617234
] 

Hudson commented on HDFS-4618:
------------------------------

Integrated in Hadoop-Yarn-trunk #169 (See [https://builds.apache.org/job/Hadoop-Yarn-trunk/169/])
    HDFS-4618. Default transaction interval for checkpoints is too low. Contributed by Todd
Lipcon. (Revision 1461783)

     Result = FAILURE
todd : http://svn.apache.org/viewcvs.cgi/?root=Apache-SVN&view=rev&rev=1461783
Files : 
* /hadoop/common/trunk/hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt
* /hadoop/common/trunk/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/DFSConfigKeys.java
* /hadoop/common/trunk/hadoop-hdfs-project/hadoop-hdfs/src/main/resources/hdfs-default.xml
* /hadoop/common/trunk/hadoop-hdfs-project/hadoop-hdfs/src/site/apt/HdfsUserGuide.apt.vm

                
> 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
>             Fix For: 3.0.0, 2.0.5-beta
>
>         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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