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MapReduce over Another MapReduce
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SwatB  
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 More options Aug 12 2012, 7:56 am
From: SwatB <bhardwaj_raj...@hotmail.com>
Date: Sun, 12 Aug 2012 04:56:53 -0700 (PDT)
Local: Sun, Aug 12 2012 7:56 am
Subject: MapReduce over Another MapReduce

Hello,
I plan to use ravendb for time-series data.
Is it possible to chain output of one map-reduce to another map-reduce.
Say for example - I create a map-reduce to create daily aggregation.
Then I use another map-reduce on the previous results to get fortnightly
aggregation.

In both of the cases, I will like to have incremental map-reduce.

If there is an example of this kind of scenario please do point to me.

regards


 
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Fitzchak Yitzchaki  
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 More options Aug 12 2012, 8:22 am
From: Fitzchak Yitzchaki <fitzc...@hibernatingrhinos.com>
Date: Sun, 12 Aug 2012 15:22:52 +0300
Local: Sun, Aug 12 2012 8:22 am
Subject: Re: [RavenDB] MapReduce over Another MapReduce

This is not supported.
See this <http://stackoverflow.com/a/10209954/257670>answer on
StackOverflow for more details.

What is that you're trying to achieve?

You can save those aggregations as documents.


 
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Oren Eini (Ayende Rahien)  
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 More options Aug 12 2012, 8:24 am
From: "Oren Eini (Ayende Rahien)" <aye...@ayende.com>
Date: Sun, 12 Aug 2012 15:24:41 +0300
Local: Sun, Aug 12 2012 8:24 am
Subject: Re: [RavenDB] MapReduce over Another MapReduce

No, create two indexes for this


 
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SwatB  
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 More options Aug 12 2012, 8:49 am
From: SwatB <bhardwaj_raj...@hotmail.com>
Date: Sun, 12 Aug 2012 05:49:48 -0700 (PDT)
Local: Sun, Aug 12 2012 8:49 am
Subject: Re: [RavenDB] MapReduce over Another MapReduce

Hello,
Thanks for your reply
I read your answer, there is something like out in MondoDB, is that what
you mean by saving  aggregations as documents. (a new collection)
What if there is another change in the base data, is there a mechanism by
which I can do upsert , I mean do the incremental thing


 
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Fitzchak Yitzchaki  
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 More options Aug 12 2012, 9:17 am
From: Fitzchak Yitzchaki <fitzc...@hibernatingrhinos.com>
Date: Sun, 12 Aug 2012 16:17:11 +0300
Local: Sun, Aug 12 2012 9:17 am
Subject: Re: [RavenDB] MapReduce over Another MapReduce

I assumed that the data won't be changed. If it may be changed, you'll need
to go with another solution.


 
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Oren Eini (Ayende Rahien)  
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 More options Aug 12 2012, 10:58 am
From: "Oren Eini (Ayende Rahien)" <aye...@ayende.com>
Date: Sun, 12 Aug 2012 17:58:40 +0300
Local: Sun, Aug 12 2012 10:58 am
Subject: Re: [RavenDB] MapReduce over Another MapReduce

Or he can use the indexed properties option


 
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SwatB  
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 More options Aug 13 2012, 8:24 am
From: SwatB <bhardwaj_raj...@hotmail.com>
Date: Mon, 13 Aug 2012 05:24:36 -0700 (PDT)
Local: Mon, Aug 13 2012 8:24 am
Subject: Re: [RavenDB] MapReduce over Another MapReduce

Hello Oren,
What do you mean I can use " indexed properties option "

regards


 
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Oren Eini (Ayende Rahien)  
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 More options Aug 13 2012, 8:26 am
From: "Oren Eini (Ayende Rahien)" <aye...@ayende.com>
Date: Mon, 13 Aug 2012 15:26:46 +0300
Local: Mon, Aug 13 2012 8:26 am
Subject: Re: [RavenDB] MapReduce over Another MapReduce

http://issues.hibernatingrhinos.com/issue/RavenDB-245


 
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