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From Harsh J <ha...@cloudera.com>
Subject Re: One NameNode keeps Rolling Edit Log on HDFS Federation
Date Sun, 24 Feb 2013 16:48:11 GMT

Federated namenodes are independent of one another (except that they
both get reports from all the/common DNs in the cluster). It is
natural to see one roll its edit logs based on its own rate of
metadata growth, as compared to the other. Their edits, image, etc.
everything is independent - they also do not know about/talk to each

Given the above, I'd say (1) is true and (2) is invalid, and (3) can
be found in PDFs attached to

On Sun, Feb 24, 2013 at 8:39 PM, YouPeng Yang <yypvsxf19870706@gmail.com> wrote:
> Hi All
>  I'm testing the HDFS Federation.I have 2 namenodes in  my cluster.
>  I find that it is  Rolling Edit Log continuously on one   namenode,however
> the other one  changes nothing.
>  My question :
>  1. Is it the right situation.
>  2. I have thought that the two namenodes shoud keep concurrency.
> why they get differences.
>  3. is there any advanced docs about HDFS Federation.
> thanks.
> Regards.

Harsh J

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