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Hadoop >> mail # user >> NameNode per-block memory usage?

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NameNode per-block memory usage?

How much memory/JVM heap does NameNode use for each block?

I've tried locating this in the FAQ and on search-hadoop.com, but couldn't find a ton of concrete numbers, just these two:

http://search-hadoop.com/m/RmxWMVyVvK1 - 150 bytes/block?
http://search-hadoop.com/m/O886P1VyVvK1 - 1 GB heap for every object?