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We have a separate Kafka cluster just for Samza's use, different from our main Kafka cluster. The main reason is that we wanted to isolate off the disk and network load of state compactions and restores (we don't use compacted topics in our main Kafka cluster, but we do use them with Samza, and the extra load on Kafka can be substantial).
How should I use/configure RocksDB stores in my Samza application?
Please follow the how-to guide here.