Hi, Ignite presently does not support auto-incremental keys. You can start discussing this feature on the Ignite Dev list and open an enhancement request if the Community agrees it worths implementation.
Right you can use Ignite's AtomicSequence <https://apacheignite.readme.io/docs/id-generator> (or AtomicLong if you need it to be sequential) to get cluster-wide sequential IDs. You still have to save the last ID somewhere.
