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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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