1) Is starting and stopping Hadoop services can only be achieved via Ambari? or are there any scripts available to start and stop the Hadoop services via command line?
2) Which one from below is actual $HADOOP_HOME?
The following doc talks about starting manually various HDP components:
Regarding HADOOP_HOME you can get more detailed information from the following discussion
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closing the loop on this question. You can start and stop any service managed by ambari via command line (rest) as well. info here
I see there are multiple symlinks created to locate folder "conf", what is the purpose behind creating multiple symlink?
@Jay Kumar SenSharma Any specific reason for lots of symlinks present for binaries in conf and etc dir. It's quite confusing sometime. Do you why it's been designed this way?