Have you tried increasing the regionserver timeout to be the same as your 
mapred task timeout? This way scanners will live at least as long as your 
tasks. 

Maybe during your upgrade your conf was changed? 

   - Andy

> From: Edward J. Yoon <[EMAIL PROTECTED]>
> Subject: org.apache.hadoop.hbase.UnknownScannerException
> To: [EMAIL PROTECTED], [email protected]
> Date: Wednesday, November 5, 2008, 11:52 PM
>
> After upgrade hadoop to 0.18.2 from 0.18.1, I received an
> UnknownScannerException. And, Map in/output bytes are only
> 288 bytes.
> 
> Does anyone know about this?
> 


      

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