Ahh, I see. But still, even with "map reduce" stratedgy, I *think* that there is only a SINGLE node which will do the reduction, right? As in, the reduction will NOT occur in parallel across nodes, right? (In fact, it sounds like the reduction won't even occur in parallel *within* a node, right?) If correct, are there any plans to change this to be more like Infinispan (see this article from 2014: https://blog.infinispan.org/2014/02/mapreduce-parallel-execution.html -- I think they've made improvements since then.) Also, could this single-reducer explain why one user complained about slow group-by? (see here: http://apache-ignite-users.70518.x6.nabble.com/Slow-Group-By-td20236.html )
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