Friendpaste

example document: 

{
   "_id": "2286-1996-08-20",
   "_rev": "2-4aa5b6393c663ae3794efd67b9bbbd87",
   "title": "A title",
   "text": "This is an example",
   "tokens": [
       "This",
       "is",
       "an",
       "example"
    ]
}

map:function(doc) {
    if ("tokens" in doc) {
        for (var i in doc.tokens) {
            emit(doc.tokens[i], doc._id);
        }
    }
}

reduce:function(keys, values) {
    var docs = [];
    for (var i = 0; i < values.length; ++i) {
        docs.push(values[i]);
    }
    return docs;
}

error msg:
Error: reduce_overflow_error

Reduce output must shrink more rapidly: Current output: '[["2650-1996-08-20","2650-1996-08-20","2650-1996-08-20","2650-1996-08-20","2650-1996-08-20","2650-19'... (first 100 of 849 bytes)