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From Jim Holloway <jim.hollo...@windstream.net>
Subject Re: TableMapReduceUtil, multiple scan objects, how to identify originating scan object in mapper
Date Tue, 22 Oct 2013 23:07:45 GMT

Yes, I can do that.

Thank you for ‘Hbase in Action’.  It’s been very valuable to me.  I also very much like
the Manning model of being able to buy the hard copy and then have the title available on
my Kindle as well.

Jim

From: Nick Dimiduk [via Apache HBase] 
Sent: Monday, October 21, 2013 7:02 PM
To: Jim Holloway 
Subject: Re: TableMapReduceUtil, multiple scan objects, how to identify originating scan object
in mapper

Hi Jim, 

I don't see an obvious way to gain access to this information. If you don't 
find a clever way to get at this, would you mind opening a ticket for this 
feature request? 

Thanks, 
Nick 


On Mon, Oct 21, 2013 at 9:44 AM, Jim Holloway 
<[hidden email]>wrote: 


> Hello, 
> 
> I’m using the new 94.6 multi scan feature to pull rows from different 
> tables 
> into a single mapper. 
> 
>                         ArrayList<Scan> scans = new ArrayList<Scan>(); 
>                         scans.add(scanMain); 
>                         scans.add(scanJunction); 
> 
>                         TableMapReduceUtil.initTableMapperJob(scans, 
>                                         EI_ExtractType3Mapper1.class, 
>                                         Text.class, 
>                                         Text.class, 
>                                         job1); 
> 
> My problem is I don’t know how to identify the source (table) of a 
> particular row coming in to my mapper job.  My first couple of map/reduce 
> jobs I had the luxury of being able to identify the table source based on a 
> specific characteristic of the row key (one of the tables having an 
> underscore(_) embedded).  Knew that was sloppy but haven’t been able to 
> find 
> a better way. 
> 
> Is there a definitive way? 
> 
> Jim 
> 
> 
> 
> 
> -- 
> View this message in context: 
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> Sent from the HBase User mailing list archive at Nabble.com. 
> 




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