def system(request):
# single Livy session
LOGGER.debug("checking for active Livy session")
livy_session = LivySession.get_active_session()
# if session found, refresh
if isinstance(livy_session, LivySession):
# refresh
livy_session.refresh_from_livy()
# create and append to list
livy_sessions = [livy_session]
elif isinstance(livy_session, QuerySet):
# loop and refresh
for session in livy_session:
session.refresh_from_livy()
# set as list
livy_sessions = livy_session
else:
livy_sessions = livy_session
# get status of background jobs
if not hasattr(settings, 'COMBINE_DEPLOYMENT') or settings.COMBINE_DEPLOYMENT != 'docker':
try:
supervisor = SupervisorRPCClient()
bgtasks_proc = supervisor.check_process('celery')
except:
LOGGER.debug('supervisor might be down?')
bgtasks_proc = None
else:
bgtasks_proc = None
# get celery worker status
active_tasks = celery_app.control.inspect().active()
if active_tasks is None:
celery_status = 'stopped'
else:
if len(next(iter(active_tasks.values()))) == 0:
celery_status = 'idle'
elif len(next(iter(active_tasks.values()))) > 0:
celery_status = 'busy'
else:
celery_status = 'unknown'
# return
return render(request, 'core/system.html', {
'livy_session': livy_session,
'livy_sessions': livy_sessions,
'celery_status': celery_status,
'bgtasks_proc': bgtasks_proc,
'breadcrumbs': breadcrumb_parser(request)
})
def livy_session(request):
'''
Make Livy session information available to all views
'''
# get active livy session
lv = LivySession.get_active_session()
return {'LIVY_SESSION': lv}
def livy_session(request):
'''
Make Livy session information available to all views
'''
# get active livy session
lv = LivySession.get_active_session()
if lv:
if type(lv) == LivySession:
# refresh single session
lv.refresh_from_livy()
elif type(lv) == QuerySet:
# multiple Combine LivySession founds, loop through
for s in lv:
s.refresh_from_livy()
else:
pass
return {'LIVY_SESSION': lv}
def livy_session_start(request):
LOGGER.debug('Checking for pre-existing livy sessions')
# get active livy sessions
active_ls = LivySession.get_active_session()
# none found
if not active_ls:
LOGGER.debug('active livy session not found, starting')
livy_session = LivySession()
livy_session.start_session()
elif isinstance(active_ls, LivySession) and request.GET.get('restart') == 'true':
LOGGER.debug(
'single, active session found, and restart flag passed, restarting')
# restart
active_ls.restart_session()
# redirect
return redirect('system')
def system_bg_status(request):
"""
View to return status on:
- Livy session
- celery worker
"""
# get livy status
livy_session = LivySession.get_active_session()
if livy_session:
if isinstance(livy_session, LivySession):
# refresh single session
livy_session.refresh_from_livy()
# set status
livy_status = livy_session.status
else:
livy_status = 'stopped'
# get celery worker status
active_tasks = celery_app.control.inspect().active()
# if None, assume celery app stopeed
if active_tasks is None:
celery_status = 'stopped'
# else, determine if idle, busy, or unknown state
else:
if len(next(iter(active_tasks.values()))) == 0:
celery_status = 'idle'
elif len(next(iter(active_tasks.values()))) > 0:
celery_status = 'busy'
else:
celery_status = 'unknown'
# return json
return JsonResponse({
'celery_status': celery_status,
'livy_status': livy_status
})