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HDFS >> mail # dev >> HDFS-903 - Backupnode always downloading image from Namenode after this change


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Sreehari G 2011-05-25, 08:08
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Todd Lipcon 2011-05-25, 17:45
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Re: HDFS-903 - Backupnode always downloading image from Namenode after this change
Hi Sreehari,

I actually also see this problem. It would be good to fix it.
You can simply create a jira describing the issue and we can discuss
there how to fix it. If you have a patch - even better.
Once fixed in trunk it can be ported to other branches,
including 0.22 or HDFS-1073-branch if desired.

Thanks,
--Konstantin

On Wed, May 25, 2011 at 10:45 AM, Todd Lipcon <[EMAIL PROTECTED]> wrote:

> Hi Sreehari,
>
> The BackupNode isn't really production-ized. I don't think anyone uses it,
> so it's not surprising that there are a lot of broken parts.
>
> If you're interested in contributing in this area, I would encourage you to
> look at the HDFS-1073 branch. The BN and CheckpointNode will be undergoing
> various surgery during the course of this project, so it's a good
> opportunity to fix it up, add test coverage, etc.
>
> -Todd
>
> On Wed, May 25, 2011 at 1:08 AM, Sreehari G <[EMAIL PROTECTED]> wrote:
>
> >  Hi all ,
> >
> > In HDFS-903 - ( md5 verification of fsimage ) , with this change ,
> > Backupnode is downloading the image & edit files from namenode everytime
> > since the difference in checkpoint time is always maintined b/w Namenode
> and
> > Backupnode . This happens since Namenode is resetting its checkpoint time
> > everytime since we are ignoring renewCheckpointTime and passing true
> > explicitly to rollFsimage during endcheckpoint ..
> >
> > Also , though a proposal for using md5 to decide whether to download
> image
> > is also mentioned , it doesnt seeem to be implemented ..
> >
> > Isn't this downloading of image everytime a problem or am I missing
> > something ?
> >
> > HUAWEI TECHNOLOGIES CO.,LTD. [image: huawei_logo]
> >
> >
> > Solitaire
> > Domlur
> > Bangalore
> > www.huawei.com
> >
> >
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>
> --
> Todd Lipcon
> Software Engineer, Cloudera
>
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Sreehari G 2011-05-27, 10:35