/commented by hamid moazed/ I figured it out. In each of my servers I start an Ignition node with REPLICATED cache mode, then I use IgniteCompute to send the query to all the server nodes, each of which puts its own local results in an IgniteSet. The set as a whole is then visible from the master node with all the results. The exceptions I was suffering from stemmed from the fact that class containing the closure method had fields which Ignite (rightfully) would try to serialize. I can still use those classes, inside the methods, i just cannot have them as fields. I had not realized this.
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