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From Allen Wittenauer <awittena...@linkedin.com>
Subject Re: How often namenode dumps in-memory hdfs meta data to disk (dfs.name.dir)?
Date Fri, 25 Jun 2010 17:17:10 GMT

On Jun 25, 2010, at 12:24 AM, jiang licht wrote:
> Then, I think that namenode will need to write editlog to disk at a regular interval.

This is incorrect.

> Correct me if I misunderstand anything.

The edits log is updated on every change.  Create a file?  Updated.  Changed permissions?
 Updated.  

> So, how often namenode write any meta data/change to dfs.name.dir?

Constantly.



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