python 3.x - When I was started hadoop cluster but cluster did not start and an issue of lacement Group -

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invalidplacementgroup.unknownthe placement group '30633_20150226' unknown.e4dc06ca-8d9e-469a-aa3f-dcddc045a9b6

check hadoop daemons runnning using command jps

if not seeing required services have restart processes.

sudo service hadoop-master stop  sudo service hadoop-master start

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