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Each map function runs in a single thread per Infinispan node! Currently we do reduction on a master node in a single thread as well! However, starting with Infinispan 5.2 we will introduce distributed reduction phase - reduce phase per intermediate output key will be run on the cluster of Infinispan nodes.
We plan to introduce multi-thread map and multi-thread reduce function execution in upcoming releases.
Thank you for your response.
I undertand current function.
I hope that Infinispan MapReduce will grow up more useful!