What's the main idea of Apache Ignite? -

gc may free memory , resources, how make object reusable when cache hited ? want deploy ignite spark, , confused keeping object across multi-nodes. can explain me?

once cache populated, simple cache.get() operation return same object. can take @ data grid documentation in ignite: https://ignite.incubator.apache.org/features/datagrid.html

also,ignite comes shared rdd implementation sharing state across spark jobs , applications. think perhaps need: https://ignite.incubator.apache.org/features/igniterdd.html