Dedicated master nodes should not serve traffic so usually low CPU and low memory. Data nodes do most of the work in the cluster so need the most resources. Hot data nodes need high CPU, fast storage and often high memory. Warm data nodes can do with slower storage but need medium CPU. The amount if memory depends on how much data they hold and how heavy this is queried, so it is common to have lots or memory on these nodes to allow them to hold lots of data. Other node types depend a lot on how much work they will be doing, so the size will depend on the size of the rest of the cluster.
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