I use 120 seconds.

The patch for HBASE-816 may work for you also: 
https://issues.apache.org/jira/secure/attachment/12387963/816.v2.patch 

   - Andy

> From: Jean-Daniel Cryans <[EMAIL PROTECTED]>
> Subject: Re: Unknown Scanner Exception
> To: [email protected]
> Date: Monday, August 11, 2008, 4:06 PM
> Dru,
> 
> It may be also caused by a compaction going on (or a flush).
> Best way to be sure is to up the regionserver lease timeout.
> Default is 30 seconds but I recommend 60 seconds for MR
> jobs. See if this works for you.
> 
> J-D
> 
> On Mon, Aug 11, 2008 at 6:34 PM, Dru Jensen
> <[EMAIL PROTECTED]> wrote:
> 
> > Hi J-D,
> >
> > I watched as one of the map tasks completed
> > successfully.  Another one was
> > launched as a child of the second MR task. then I get
> > the Unknown Scanner
> > Exception:
> > org.apache.hadoop.hbase.UnknownScannerException:
> > org.apache.hadoop.hbase.UnknownScannerException: Name:
> > -463563612898654250
[...]



      

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