MySQL Cluster logs lot of "scanIndex_abort" (no replies)

Hello,

We are testing our application for performance and we see in the MySQL cluster Data node log a lot of these messages:
...
H'003eb68a H'01703500 scanIndex_abort state: 3
...
No other errors or warnings.

The MySQL Cluster version: mysql-5.5.35 ndb-7.2.15

Can you please help me understand the message: scanIndex_abort state: 3?
What does it mean?

Thanks,

Ovidiu