scheduling a task at multiple timings(with different parameters) using celery beat but task run only once(with random parameters) - python-3.x

Question

What i am trying to achieve
Write a scheduler, that uses a database to schedule similar tasks at different timings.
For the same i am using celery beat, the code snippet below would give an idea
try:
reader = MongoReader()
except:
raise
try:
tasks = reader.get_scheduled_tasks()
except:
raise
celerybeat_schedule = dict()
for task in tasks:
celerybeat_schedule[task["task_id"]] =dict()
celerybeat_schedule[task["task_id"]]["task"] = task["task_name"]
celerybeat_schedule[task["task_id"]]["args"] = (task,)
celerybeat_schedule[task["task_id"]]["schedule"] = get_task_schedule(task)
app.conf.update(BROKER_URL=rabbit_mq_endpoint, CELERY_TASK_SERIALIZER='json', CELERY_ACCEPT_CONTENT=['json'], CELERYBEAT_SCHEDULE=celerybeat_schedule)
so these are three steps
- reading all tasks from datastore
- creating a dictionary, celery scheduler which is populated by all tasks having properties, task_name(method that would run), parameters(data to pass to the method), schedule(stores when to run)
- updating this with celery configurations
Expected scenario
given all entries run the same celery task name that just prints, have same schedule to be run every 5 min, having different parameters specifying what to print, lets say db has
task name , parameter , schedule
regular_print , Hi , {"minutes" : 5}
regular_print , Hello , {"minutes" : 5}
regular_print , Bye , {"minutes" : 5}
I expect, these to be printing every 5 minutes to print all three
What happens
Only one of Hi, Hello, Bye prints( possible randomly, surely not in sequence)
Please help,
Thanks a lot in advance :)

Answer 1

Was able to resolve this using version 4 of celery. Sample similar to what worked for me.. can also find in documentation by celery for version 4
#taking address and user-pass from environment(you can mention direct values)
ex_host_queue = os.environ["EX_HOST_QUEUE"]
ex_port_queue = os.environ["EX_PORT_QUEUE"]
ex_user_queue = os.environ["EX_USERID_QUEUE"]
ex_pass_queue = os.environ["EX_PASSWORD_QUEUE"]
broker= "amqp://"+ex_user_queue+":"+ex_pass_queue+"#"+ex_host_queue+":"+ex_port_queue+"//"
#celery initialization
app = Celery(__name__,backend=broker, broker=broker)
app.conf.task_default_queue = 'scheduler_queue'
app.conf.update(
task_serializer='json',
accept_content=['json'], # Ignore other content
result_serializer='json'
)
task = {"task_id":1,"a":10,"b":20}
##method to update scheduler
def add_scheduled_task(task):
print("scheduling task")
del task["_id"]
print("adding task_id")
name = task["task_name"]
app.add_periodic_task(timedelta(minutes=1),add.s(task), name = task["task_id"])
#app.task(name='scheduler_task')
def scheduler_task(data):
print(str(data["a"]+data["b"]))