hadoop - Non localization by Resourse Manager in YARN -


in definitive guide of hadoop mentioned that:

"sometimes locality constraint cannot met, in case either no allocation made or, optionally, constraint can loosened. example, if specific node requested not possible start container on (because other containers running on it), yarn try start container on node in same rack, or, if that’s not possible, on node in cluster."

i not able this, because if application manager needs container on particular node block resides , in case if rm not able create container on particular node requested due unavailability, may create container on node according above sentence, how serve purpose of localization?


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