Mailing-List: contact hdfs-issues-help@hadoop.apache.org; run by ezmlm
Precedence: bulk
Reply-To: hdfs-issues@hadoop.apache.org
Date: Fri, 1 Apr 2011 22:15:05 +0000 (UTC)
From: "Todd Lipcon (JIRA)" <jira@apache.org>
To: hdfs-issues@hadoop.apache.org
Message-ID: 
 <407927124.29580.1301696105920.JavaMail.tomcat@hel.zones.apache.org>
In-Reply-To: 
 <358551071.29457.1301691906126.JavaMail.tomcat@hel.zones.apache.org>
Subject: [jira] [Commented] (HDFS-1800) Extend image checksumming to
 function with multiple fsimage files
MIME-Version: 1.0
Content-Type: text/plain; charset=utf-8
Content-Transfer-Encoding: 7bit


    [ https://issues.apache.org/jira/browse/HDFS-1800?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13014852#comment-13014852 ] 

Todd Lipcon commented on HDFS-1800:
-----------------------------------

I'm leaning towards option #1 since it will make writing new files slightly simpler - no need to read in and re-write an existing file.

> Extend image checksumming to function with multiple fsimage files
> -----------------------------------------------------------------
>
>                 Key: HDFS-1800
>                 URL: https://issues.apache.org/jira/browse/HDFS-1800
>             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)
>
>
> HDFS-903 added the MD5 checksum of the fsimage to the VERSION file in each image directory. This allows it to verify that the FSImage didn't get corrupted or accidentally replaced on disk.
> With HDFS-1073, there may be multiple fsimage_N files in a storage directory corresponding to different checkpoints. So having a single MD5 in the VERSION file won't suffice. Instead we need to store an MD5 per image file.

--
This message is automatically generated by JIRA.
For more information on JIRA, see: http://www.atlassian.com/software/jira