I have a question regarding the NameNode Heap Size allocation. In our production we have 120 datanodes and total HDFS space of 1.9 PB. I am not sure how much memory has to be allocated for NameNode heap size and on what basis we have to allocate that. Currently we have allocated 48 GB of which 24 % is already used. Is this is the expected behaviour of NameNode.
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