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" <[email protected]> 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.
.
