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POassertion exception in mongo mapreduce
 

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  1. POassertion exception in mongo mapreduce
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    <p>I have a collection that stores search query logs. It's two main attributes are user_id and search_query. user_id is null for a logged out user. I am trying to run a mapreduce job to find out the count and terms per user.</p> <pre> var map = function(){ if(this.user_id !== null){ emit(this.user_id, this.search_query); } } var reduce = function(id, queries){ return Array.sum(queries + ","); } db.searchhistories.mapReduce(map, reduce, { query: { "time" : { $gte : ISODate("2013-10-26T14:40:00.000Z"), $lt : ISODate("2013-10-26T14:45:00.000Z") } }, out : "mr2" } ) </pre> <p>throws the following exception</p> <pre> Wed Nov 27 06:00:07 uncaught exception: map reduce failed:{ "errmsg" : "exception: assertion src/mongo/db/commands/mr.cpp:760", "code" : 0, "ok" : 0 } </pre> <p>I looked at <a href="https://github.com/mongodb/mongo/blob/master/src/mongo/db/commands/mr.cpp#L760" rel="nofollow">mr.cpp L#760</a> but could not gather any vital information. What could be causing this?</p> <p>My Collection has values like</p> <pre> > db.searchhistories.find() { "_id" : ObjectId("5247a9e03815ef4a2a005d8b"), "results" : 82883, "response_time" : 0.86, "time" : ISODate("2013-09-29T04:17:36.768Z"), "type" : 0, "user_id" : null, "search_query" : "awareness campaign" } { "_id" : ObjectId("5247a9e0606c791838005cba"), "results" : 39545, "response_time" : 0.369, "time" : ISODate("2013-09-29T04:17:36.794Z"), "type" : 0, "user_id" : 34225174, "search_query" : "eficaz eficiencia efectividad" } </pre>
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    1. This table or related slice is empty.
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    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. This table or related slice is empty.
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    1. This table or related slice is empty.
    1. COWhich mongodb version is this?
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    2. COMongo v2.2.1. I am trying to run it on a slave node.
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      1. USpr4n
 

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