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From Dru Jensen <drujen...@gmail.com>
Subject Re: NotServingRegionException - Map/Reduce process fails
Date Thu, 23 Oct 2008 22:44:11 GMT

Sorry for the confusion, I am not using the old implementation of  
TableReduce.  The new 0.19.0 changed this to an interface.  The reduce  
process is performing calculations.  It's not just writing to the  
table and requires the sort.

I will change the region size back and see if that helps.  If I find  
that I need a larger region, should I change the flush by the same  


On Oct 23, 2008, at 2:18 PM, stack wrote:

> Any reason you need to use TableReduce?  If you delay the insert  
> into hbase till reduce-time, it means 1.), the MR framework has  
> spent a bunch of resources shuffling and sorting your data, a sort  
> that is going to happen on hbase insert anyways, and 2). your  
> inserts are going into hbase in order so you pound one region rather  
> than insert across all.  You might try inserting into hbase at the  
> tail of your map task and output nothing (or something small to keep  
> up the job counters).
> Are your rows > 256MB? At the moment at least, there needs to be a  
> bit of balance maintained between flushing, compacting and  
> splitting.  The defaults do that.  I'm not sure what happens when  
> you double the max filesize but not correspondingly the flushsize.   
> You might trying restoring the default (hbase will not try and split  
> a row if its > configured maxfile size).
> St.Ack

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