Hello,

Assuming I have a database: 'boo', with sharding enabled,
And collection: 'uri', with the compound index:

. sharded by key:

I want to presplit the collection only using k1. k2 doesn't matter.
Since the system doesn't allow to split by partial shard key, I read here : http://stackoverflow.com/questions/9516206/pre-split-on-a-compound-shard-key,
that you can split in the following way:
db.runCommand( { split : "boo.uri" , middle :

} );
db.runCommand( { split : "boo.uri" , middle :

} );
db.runCommand( { split : "boo.uri" , middle :

} );

This works perfect on the mongo console. but since I'm working with the mongodb client, and I need to send the MaxKey somehow, it fails to work.
Attached the script I used to test the splitting (after having the db and collection indexed and sharded ready)
It includes various tries and the response from mongo.

How can I solve this?
How do I serialize MaxKey properly and get it to work?

Thanks in advance