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No Journalnode to stop


While i am trying to stop journalnode process it gives no journal node to stop, but journal node is actually running

i executed in the follwing way.

451 jps
3541 journalnode

And i try to stop journal using

apache_hadoop/sbin/ stop journalnode
no journalnode to stop

then i just killed the process and started it again

kill 3541
apache_hadoop/sbin/ start journalnode

and journalnode started normally

This issue not only for journal node , it happens all the nodes in hadoop cluster at some time

Why this issue? and How to solve it?