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Namenode Best Pratices / Performance tunning checklist

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Does anyone have a best practices guide / performance checklist for namenode?

I know when we increase namenode_heapsize, we should also adjust namenode_opt_newsize, namenode_opt_maxnewsize, namenode_opt_permsize, namenode_opt_maxpermsize, but what are the reference calculations for this adjustment?

Also there is: dfs.namenode.handler.count and dfs.namenode.service.handler.count, as discussed in question below, but same here, what are reference values for these properties? Is it based number of nodes only or should also be increased based on usage patterns? https://community.hortonworks.com/questions/4799/is-there-any-suggested-ratio-for-dividing-the-numb....

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Thank you @kmungee.

Would you have other configuration to check on namenode service?