Issue while starting Python,Spark and Gunicorn - capistrano3

Question

I am trying to restart Python, gunicorn and spark as soon as the Capistrano completes the deployment but I am getting the below error. However, When I tried to execute these commands on the server by ssh then it is working fine.
Function in deploy.rb:
desc 'Restart django'
task :restart_django do
on roles(:django), in: :sequence, wait: 5 do
within "#{fetch(:deploy_to)}/current/" do
execute "cd #{fetch(:deploy_to)}/current/ && source bin/activate "
execute "sudo /etc/init.d/supervisor stop && sudo fuser -k 8000/tcp && pkill -f python && pkill -f gunicorn && pkill -f spark"
#execute " cd /home/ubuntu/code/spark-2.1.0-bin-hadoop2.7/sbin/ && ./start-master.sh && ./start-slave.sh spark://127.0.0.1:7077;"
#execute "sleep 20"
#execute "cd /home/ubuntu/code/ && nohup gunicorn example.wsgi:application --name example --workers 4 &"
end
end
end
Deploy Output:
cap dev deploy:restart_django
Using airbrussh format.
Verbose output is being written to log/capistrano.log.
00:00 deploy:restart_django
01 cd /home/ubuntu/code/ && source bin/activate
✔ 01 ubuntu#xx-xx-xx-xx-xx.us-west-1.compute.amazonaws.com 2.109s
02 sudo /etc/init.d/supervisor stop && sudo fuser -k 8000/tcp && pkill -f python gunicorn spark
(Backtrace restricted to imported tasks)
cap aborted!
SSHKit::Runner::ExecuteError: Exception while executing as ubuntu#ec2-54-244-99-254.us-west-2.compute.amazonaws.com: sudo /etc/init.d/supervisor stop && sudo fuser -k 8000/tcp && pkill -f python gunicorn spark exit status: 1
sudo /etc/init.d/supervisor stop && sudo fuser -k 8000/tcp && pkill -f python gunicorn spark stdout: Stopping supervisor: supervisord.
sudo /etc/init.d/supervisor stop && sudo fuser -k 8000/tcp && pkill -f python gunicorn spark stderr: Nothing written
SSHKit::Command::Failed: sudo /etc/init.d/supervisor stop && sudo fuser -k 8000/tcp && pkill -f python gunicorn spark exit status: 1
sudo /etc/init.d/supervisor stop && sudo fuser -k 8000/tcp && pkill -f python gunicorn spark stdout: Stopping supervisor: supervisord.
sudo /etc/init.d/supervisor stop && sudo fuser -k 8000/tcp && pkill -f python gunicorn spark stderr: Nothing written
Tasks: TOP => deploy:restart_django
(See full trace by running task with --trace)

Answer 1

Capistrano by default invokes no-login, non-interactive shell. However, It's not the good option to use login shell with it but I am able to solve the issue by invoking the login shell under Capistrano execute with below command.
execute "bash --login -c 'pkill -f spark'", raise_on_non_zero_exit: false