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From Steve Loughran <ste...@apache.org>
Subject Re: Identifying why a task is taking long on a given hadoop node
Date Sun, 05 Jun 2011 10:08:10 GMT
On 03/06/2011 12:24, Mayuresh wrote:
> Hi,
>
> I am really having a hard time debugging this. I have a hadoop cluster and
> one of the maps is taking time. I checked the "datanode" logs and can see no
> activity for around 10 minutes!
>

The usual cause here is imminent disk failure, as reads start to take 
longer and longer. look at your SMART disk logs, do some performance 
tests of all the drives


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