Hadoop pid file location and file name

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The default pid file location for a hadoop cluster as of 19.1 and 19.2, might also be the same for earlier versions of hadoop

/tmp/hadoop-[USERNAME]-[NODETYPE].pid

I usually run hadoop as root so here is an example of the default pid file for a datanode

/tmp/hadoop-root-datanode.pid

NODETYPES
namenode
datanode
tasktracker

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