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From Gregory Tappero <cou...@gmail.com>
Subject Re: Map reduce and weird output question
Date Mon, 08 Mar 2010 07:03:58 GMT
My number of keys is 4, year month day userame so returning the bbr of
keys in reduce does not seem to give me the output i am looking for.
Unless i misunderstood something.

Thank you for helping,

Greg

On Mon, Mar 8, 2010 at 12:28 AM, Randall Leeds <randall.leeds@gmail.com> wrote:
> I'm not an expert on this, but I think you need to create your own
> reduce function and output the number of keys rather than the sum of
> the values.
>
> On Sun, Mar 7, 2010 at 15:15, Gregory Tappero <coulix@gmail.com> wrote:
>> Thank you Pawel,
>>
>> If i try to follow your way it gives me the count of docs in a given
>> day for each username, what i would like is the count of unique
>> usernames for a given day.
>>
>> function(doc) {
>>
>>    if (doc.doc_type=="EdoPing" && doc.em_type==0) {
>>        date = new Date().setRFC3339(doc.created_at);
>>        emit([date.getFullYear(), parseInt(date.getMonth())+1,
>> date.getDate(), doc.em_uname] , 1);
>>
>>    }
>> }
>>
>> Reduce:
>>  _count
>>
>> =================
>> I get:
>>
>> [2010, 3, 3, "student1"]         5
>> [2010, 3, 4, "student1"]         18
>> [2010, 3, 5, "eong"]             77
>> [2010, 3, 6, "bkante"]           71
>> [2010, 3, 6, "jfrancillette"]    72
>> [2010, 3, 6, "mlouviers"]        12
>> [2010, 3, 7, "student1"]         4
>>
>> I would like to extract the following
>>
>> [2010, 3, 3]       1
>> [2010, 3, 4]       1
>> [2010, 3, 5]    1
>> [2010, 3, 6]       3
>> [2010, 3, 7]       1
>>
>>
>> if i do a group_level=3 it sum the values.
>>
>> {"key":[2010,3,3],"value":5},
>> {"key":[2010,3,4],"value":18},
>> {"key":[2010,3,5],"value":77},
>> {"key":[2010,3,6],"value":155},
>> {"key":[2010,3,7],"value":4}
>>
>> How can i count the unique username emitter per day ?
>>
>>
>>
>>
>> On Sun, Mar 7, 2010 at 10:02 PM, Paweł Stawicki <pawelstawicki@gmail.com>
wrote:
>>> Just emit all documents with em_type = 0 in map function, with [date,
>>> em_uname] as key. Then count in reduce.
>>>
>>> Map:
>>> function(doc) {
>>>  if (doc.em_type = 0) {
>>>    //If you only want to count, you can emit anything (e.g. 1) instead of
>>> doc here.
>>>    emit([date, em_uname], doc);
>>>  }
>>> }
>>>
>>> Reduce:
>>> function(keys, values, rereduce) {
>>>  if (!rereduce) {
>>>    return count_of_values;
>>>  } else {
>>>    return sum_of_values;
>>>  }
>>>
>>>  //If you return 1 from emit instead of doc, then count_of_values ==
>>> sum_of_values
>>> }
>>>
>>> Then you can handle everything by grouping:
>>> http://yourserver:5984/yourdb/_view/yourview?group_level=2
>>> or group=true
>>>
>>> Regards
>>> --
>>> Paweł Stawicki
>>> http://pawelstawicki.blogspot.com
>>> http://szczecin.jug.pl
>>>
>>>
>>>
>>> On Sat, Mar 6, 2010 at 16:26, Gregory Tappero <coulix@gmail.com> wrote:
>>>
>>>> Hello everyone,
>>>>
>>>> I have the following EdoPing 's type of documents
>>>>
>>>> {
>>>>   "_id": "22add509c1e7bc286832edc5bfe99ce5",
>>>>   "_rev": "1-49663ab8778f445e481143120d0d7086",
>>>>   "doc_type": "EdoPing",
>>>>   "em_uname": "student1",
>>>>   "em_gid": 1,
>>>>   "created_at": "2010-03-03T14:18:19Z",
>>>>   "em_ip": "92.154.70.148",
>>>>   "em_type": 0,
>>>>   "room_url": "z2fudcvcrfa3reaydatre",
>>>>   "room_users": [
>>>>       "tutorsbox"
>>>>   ]
>>>> }
>>>>
>>>> i would like to count all unique em_uname of em_type 0 on a given day date.
>>>>
>>>> For now i used this map/reduce
>>>> http://friendpaste.com/5xUUQ26bbl9d5KRB8eojwe
>>>>
>>>> Date.prototype.setRFC3339 = function(dString){
>>>>    var regexp =
>>>>
>>>> /(\d\d\d\d)(-)?(\d\d)(-)?(\d\d)(T)?(\d\d)(:)?(\d\d)(:)?(\d\d)(\.\d+)?(Z|([+-])(\d\d)(:)?(\d\d))/;
>>>>
>>>>    if (dString.toString().match(new RegExp(regexp))) {
>>>>        var d = dString.match(new RegExp(regexp));
>>>>        var offset = 0;
>>>>
>>>>        this.setUTCDate(1);
>>>>        this.setUTCFullYear(parseInt(d[1],10));
>>>>        this.setUTCMonth(parseInt(d[3],10) - 1);
>>>>        this.setUTCDate(parseInt(d[5],10));
>>>>        this.setUTCHours(parseInt(d[7],10));
>>>>        this.setUTCMinutes(parseInt(d[9],10));
>>>>        this.setUTCSeconds(parseInt(d[11],10));
>>>>        if (d[12])
>>>>            this.setUTCMilliseconds(parseFloat(d[12]) * 1000);
>>>>        else
>>>>            this.setUTCMilliseconds(0);
>>>>        if (d[13] != 'Z') {
>>>>            offset = (d[15] * 60) + parseInt(d[17],10);
>>>>            offset *= ((d[14] == '-') ? -1 : 1);
>>>>            this.setTime(this.getTime() - offset * 60 * 1000);
>>>>        }
>>>>    } else {
>>>>        this.setTime(Date.parse(dString));
>>>>    }
>>>>    return this;
>>>> };
>>>>
>>>> var seenKeys = new Array();
>>>>
>>>> function(doc) {
>>>>
>>>>
>>>>    if (doc.doc_type=="EdoPing" && doc.em_type==0) {
>>>>        date = new Date().setRFC3339(doc.created_at);
>>>>        var key = doc.em_uname + String(doc.created_at).substring(0,10);
>>>>        if (seenKeys[key] ==  undefined  ) {
>>>>            seenKeys[key] = 1;
>>>>            emit([date.getFullYear(), parseInt(date.getMonth())+1,
>>>> date.getDate() ] , 1);
>>>>         }
>>>>    }
>>>> }
>>>>
>>>>
>>>> It works when saved for this first time but as soon as new EdoPings
>>>> get added it starts emitting rows it has already seen ! (same key)
>>>> creating faulty count results.
>>>>
>>>> Is it ok to have seenKeys outside of the doc function() ?
>>>> What other way could i use to get the same results ?
>>>>
>>>> Thanks,
>>>>
>>>> Greg
>>>>
>>>
>>
>>
>>
>> --
>> Greg Tappero
>> CTO co founder Edoboard
>> http://www.edoboard.com
>> +33 0645764425
>>
>



-- 
Greg Tappero
CTO co founder Edoboard
http://www.edoboard.com
+33 0645764425

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