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Conflicting Ambari recommendations for MapReduce memory setting

Conflicting Ambari recommendations for MapReduce memory setting

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85660-pic1.png

I am setting up a 4 node cluster with each node has 256GB physical memory. At "Customize Services" step, MapReduce2 recommend the maximum memory usage is 30GB. See attached pic1. But when completing the setup, I got the warning of those memory settings should be ~55GB. See attached pic2. If I force those settings to 55GB, then I got another sets of warning complaining that I should not exceed 30GB.

Please advise which recommendation should I follow

85661-pic2.png