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Are all files metadata stored in memory all the time?

Question asked by jitx87 on May 6, 2013
Latest reply on May 9, 2013 by Ted Dunning
MapR's main USP is the distributed namenode architecture but I was wondering whether all the files' metadata is still stored in memory?
Or is it that when a file is less frequently used its metadata is removed from primary memory (say after a timeout) and kept in disk to be loaded when when it is accessed again?