Hi John, 1. Partition is basically just a portion of the data mapped to a particular node. Every key in a cache is assigned to certain partition. By default there are 1024 partitions and generally there is no need to change the value. But if needed, it can be done via RendezvousAffinityFunction#partitions configuration property.
2. Partition files contain actual data state, so they are mutable. When pages are persisted, they overwrite previous values. -Val -- Sent from: http://apache-ignite-users.70518.x6.nabble.com/
