Ignite uses a write-ahead log which logs logical database modifications and page changes.
N-ary Storage Model (Row/Record)
Apache Ignite is a memory-centric distributed database.
According to Ignite's confluence page, consistent checkpointing has been implemented in the system. The fuzzy checkpointing may be implemented in future releases.
Ignite uses a key-value store. And Ignite determines the location of the data using a pluggable hashing algorithm. It means every client can determine where the value is stored by plugging the key into a hashing function.
The nodes Ignite nodes can automatically discover each other. This helps to scale the cluster when needed, without having to restart the whole cluster.