MongoException: non-utf8 string: in MongoCollection->save() (line 198 of

I am getting this as well, and cannot do a migration as drush halts with this error. Adding mongo.utf8 = 0 to php.ini no longer works as it worked only up to Mongodb 1.1.

Perhaps the module could add iconv function
http://stackoverflow.com/questions/5920626/mongodb-php-utf-8-problems

I researched this further, and I see lots of issues:

I notice the module files have utf8 without bom encoding according to notepad++, but drupal modules should be either utf8 or ansi.

I also printed out the entity where mongo complains, and the node title and the geofield seem garbled, but these are proper utf8 columns in mysql, so either drush or mongodb module messes the data up.

    [title] => Academy Golf Ãtterem
    [uid] => 1
    [status] => 1
    [created] => 1337348955
    [changed] => 1371556742
    [comment] => 2
    [promote] => 1
    [sticky] => 0
    [tnid] => 0
    [translate] => 0
    [field_r_fax] =>
    [field_r_email] =>
    [field_r_website] =>
    [field_r_contact_person] =>
    [field_r_description] =>
    [field_r_capacity] =>
    [field_r_address] => Array
        (
            [country] => HU
            [administrative_area] =>
            [sub_administrative_area] =>
            [locality] => Budapest
            [dependent_locality] =>
            [postal_code] => 1037
            [thoroughfare] => Perényi út 6.
            [premise] =>
            [sub_premise] =>
            [organisation_name] =>
            [name_line] =>
            [first_name] =>
            [last_name] =>
            [data] =>
        )
    [field_r_geofield] => Array
        (
            [geom] => F_A±3@ñë©ÅG@
            [geo_type] => point
            [lat] => 47.5442382
            [lon] => 19.0261475
            [top] => 47.5442382
            [bottom] => 47.5442382
            [right] => 19.0261475
            [left] => 19.0261475
            [geohash] => u2mw2znmm27u4
        )

PS: Geofield geom data seems suspicious. It is stored as bin in mysql, and mongo seems to choke on it. Raised a new issue for that #2022281: Ability to specify Mongo Bin Data for fields

This is not a mongo issue, data sent to mongo should be utf-8

kughukg