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POMongo Map Reduce error
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  1. POMongo Map Reduce error
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    copied!<p>Being a newbie to MongoDB I'm trying to get a MapReduce call going. Unfortunately I get the following error:</p> <pre><code>mongos&gt; db.events.mapReduce(m,r,"errors"); Fri Apr 12 11:39:15.637 JavaScript execution failed: map reduce failed:{ "ok" : 0, "errmsg" : "MR parallel processing failed: { errmsg: \"exception: reduce -&gt; multiple not supported yet\", code: 10075, ok: 0.0 }" } at src/mongo/shell/collection.js:L970 mongos&gt; </code></pre> <p>I'm using Mongo 2.4.0</p> <p>My events collection looks like this:</p> <pre><code>{ "sid" : "1UADM45MCGRTW ", "time" : ISODate("2013-04-08T11:33:13.229Z"), "class" : "S", "service" : "service1" } { "sid" : "1UADM45MCGRTW ", "time" : ISODate("2013-04-08T11:33:13.229Z"), "class" : "I", "service" : "service1" } { "sid" : "1UADM45MCGRTW ", "time" : ISODate("2013-04-08T11:33:13.236Z"), "class" : "E", "text" : "error message" } { "sid" : "1UADM45MCGRTW ", "time" : ISODate("2013-04-08T11:33:13.239Z"), "class" : "F", "service" : "service1" } { "sid" : "1UDO3H7YUOK08 ", "time" : ISODate("2013-04-08T11:33:08.095Z"), "class" : "S", "service" : "service2" } { "sid" : "1UDO3H7YUOK08 ", "time" : ISODate("2013-04-08T11:33:08.095Z"), "class" : "I", "service" : "service2" } { "sid" : "1UDO3H7YUOK08 ", "time" : ISODate("2013-04-08T11:33:08.173Z"), "class" : "E", "text" : "another error message" } { "sid" : "1UDO3H7YUOK08 ", "time" : ISODate("2013-04-08T11:33:08.188Z"), "class" : "F", "service" : "service2" } { "sid" : "1UDO3JVXIS2UZ ", "time" : ISODate("2013-04-08T11:28:39.480Z"), "class" : "I", "service" : "service1" } { ""sid" : "1UDO3JVXIS2UZ ", "time" : ISODate("2013-04-08T11:28:39.480Z"), "class" : "S", "service" : "service1" } { "sid" : "1UDO3JVXIS2UZ ", "time" : ISODate("2013-04-08T11:28:40.853Z"), "class" : "F", "service" : "service1" } { "sid" : "1UDO3JVXIS2UZ ", "time" : ISODate("2013-04-08T11:28:40.852Z"), "class" : "I", "service" : "service1" } </code></pre> <p>My intention is to get all "E" entries and combine them with the "service" field of the corresponding "sid" of a "F" entry. So this should be very simple but I couldn't get it going (because of the above error).</p> <p>The map/reduce functions I used are:</p> <pre><code>var m = function() { if (this.class == "E") { value = { time: this.time, error: this.text }; emit(this.sid, value); } else if (this.class == "F") { value = { service: this.service }; emit(this.sid, value); } } var r = function(key,values) { return values; } db.events.mapReduce(m,r,"errors"); </code></pre>
 

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