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Handling Array of Large size in Map/Reduce Mongo
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Maruthi Shanmugam  
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 More options Aug 28 2012, 5:08 am
From: Maruthi Shanmugam <maruti.n...@gmail.com>
Date: Tue, 28 Aug 2012 02:07:59 -0700 (PDT)
Local: Tues, Aug 28 2012 5:07 am
Subject: Handling Array of Large size in Map/Reduce Mongo

Hi
We want to handle array of huge sizes which is generated as a result of
Map/Reduce.
The challenge we are facing is , when the array.length is more than 13K ,
the map/reduce job fails  stating that array is too large.
Can you please let us know ,how to overcome this challenge.

Regards
Maruthi S


 
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gregor  
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 More options Aug 28 2012, 7:43 am
From: gregor <gre...@10gen.com>
Date: Tue, 28 Aug 2012 04:43:26 -0700 (PDT)
Local: Tues, Aug 28 2012 7:43 am
Subject: Re: Handling Array of Large size in Map/Reduce Mongo

Can you share the exact error message you are receiving?


 
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Maruthi Shanmugam  
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 More options Aug 28 2012, 8:16 am
From: Maruthi Shanmugam <maruti.n...@gmail.com>
Date: Tue, 28 Aug 2012 05:16:45 -0700 (PDT)
Local: Tues, Aug 28 2012 8:16 am
Subject: Re: Handling Array of Large size in Map/Reduce Mongo

com.mongodb.CommandResult$CommandFailure: command failed [command failed
[mapreduce] { "serverUsed" : "XXXX" , "assertion" : "*value too large to
reduce*" , "assertionCode" : 13070 , "errmsg" : "db assertion failure" ,
"ok" : 0.0}


 
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Scott Hernandez  
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 More options Aug 28 2012, 8:42 am
From: Scott Hernandez <scotthernan...@gmail.com>
Date: Tue, 28 Aug 2012 08:42:24 -0400
Local: Tues, Aug 28 2012 8:42 am
Subject: Re: [mongodb-user] Re: Handling Array of Large size in Map/Reduce Mongo
Is there any related log entries on the server at this time?

Each document is limited to much less than 16MB (8MB if I remember
correctly) so you can't have an array, or any value in the doc, which
will exceed this for any given emitted key (the group by part on the
emit call). Do you expect that you are trying to do this by creating a
large array? If so, can you create multiple emitted documents during
the map phase to break things up?

On Tue, Aug 28, 2012 at 8:16 AM, Maruthi Shanmugam


 
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