I'm sorry but MySQL Cluster is pure refined salty horse shit. Nothing more. We're currently at the office trying to recover our production data from its filthy hands.
I had MySQL clustering in the lab with some serious live traffic for about a month. Unless you have a team of DBs whose job is just to monitor it and keep it going MacGyver style, seriously forget it.
There are other better options out there, with less headaches!
Why did you deployed such a "horse shit" product ?
>>>> to recover our production data
Don't you have a backup ?