question Starting and stopping hadoop services from command line in Support Questions

Starting and stopping hadoop services from command line

s_ambardekar — Sat, 25 Feb 2017 14:56:04 GMT

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?

/usr/hdp/2.5.3.0-37/etc/hadoop/conf.empty/ /etc/hadoop/2.5.3.0-37/0/

Please advise.

Thank you,

Sachin A

Re: Starting and stopping hadoop services from command line

jsensharma — Sat, 25 Feb 2017 15:12:28 GMT

@Sachin Ambardekar

The following doc talks about starting manually various HDP components:

http://docs.hortonworks.com/HDPDocuments/HDP2/HDP-2.5.3/bk_reference/content/starting_hdp_services.html

Regarding HADOOP_HOME you can get more detailed information from the following discussion

https://community.hortonworks.com/questions/20694/hadoop-installation-directory.html

Example:

http://docs.hortonworks.com/HDPDocuments/HDP2/HDP-2.3.4/bk_upgrading_hdp_manually/content/start-mahout-20.html

export HADOOP_HOME=/usr/hdp/current/hadoop-client

Re: Starting and stopping hadoop services from command line

sunile_manjee — Sat, 25 Feb 2017 20:34:22 GMT

closing the loop on this question. You can start and stop any service managed by ambari via command line (rest) as well. info here

https://cwiki.apache.org/confluence/pages/viewpage.action?pageId=41812517

Re: Starting and stopping hadoop services from command line

s_ambardekar — Sun, 26 Feb 2017 04:03:20 GMT

I see there are multiple symlinks created to locate folder "conf", what is the purpose behind creating multiple symlink?

Please advise.

Thank you,

Sachin A

Re: Starting and stopping hadoop services from command line

sandeepksaini — Thu, 22 Feb 2018 06:10:02 GMT

@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?