Python, Apscheduler issue -- Job running twice instead of once

Question

I am building a project using python. I have to schedule some jobs so i am using apscheduler. The scheduler is working fine on Windows Apache. But when i moved the project to Amazon Ubuntu instance i am facing an issue i-e all jobs are running after certain interval of time but instead of once it is running twice.. So i have two instances of every job running at the same time. Everything is working fine on Windows instance...I am using wsgi-python. Below is my wsgi file..

import os
import sys

sys.path.append('C:/Django/sweetspot/src/sweetspot')
os.environ['DJANGO_SETTINGS_MODULE'] = 'settings_server'

from jobs.FeedAndNews import FeedParse, NewsParse
from apscheduler.scheduler import Scheduler

import django.core.handlers.wsgi
application = django.core.handlers.wsgi.WSGIHandler()

today = datetime.datetime.today()
nex = datetime.timedelta(hours=1)
startsat = today + nex
timestr = startsat.strftime("%Y-%m-%d %H:%M:%S")   

scheduler = Scheduler()
scheduler.start()

scheduler.add_interval_job(FeedParse, hours=1, start_date=timestr)
scheduler.add_interval_job(NewsParse, hours=1, start_date=timestr)

Below are the versions of python and apcheduler: Python 2.7, apscheduler-2.1.1

Can someone please help me out in identifying the issue.. Appreciate your help. Thanks in advance..

Answer 1

There are two different approaches to cater this problem without stopping multi-processing.

--First one is to use locking mechanism. You can create a file which will act as a shared resource and which ever process open it first it can write a lock character inside this way only one of the process will actually run the jobs.

--Second we can separate jobs from all the other code. What we can do is we can create cron jobs this way jobs will have no effect on server restart.