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From V Satish Kumar <satish.ku...@mkhoj.com>
Subject Re: dfs health Dashboard
Date Tue, 03 Nov 2009 05:47:44 GMT
Hi Allen,

 Once a node goes down, the dfs health dashboard takes 40 to 45 minutes 
to refresh the status from live to dead.
 But I see that the 'Last Contact'  field at Live 'dfsnodelist' page 
getting updated every 30 seconds.

Allen Wittenauer wrote:
> On 11/1/09 10:11 PM, "V Satish Kumar" <satish.kumar@mkhoj.com> wrote:
>> I have noticed that the dfs health dashboard(Running on port  50070)
>> takes a long time to refresh the number of live nodes and dead nodes. Is
>> there a config parameter in hadoop that can be changed to make the
>> dashboard shows these changes more quickly?
> What do you mean by "long time"?  Hours? Days?
> Keep in mind that you don't want a failure to be "instantaneous" because
> that means every time there is even a minor, temporary blip the namenode and
> the network will be busy replicating blocks that are just going to re-appear
> in a minute or so anyway.
> .

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