celery chain is not triggering second task

Question

I have two celery Tasks which should be run in strict order.

def celery_run_tasks():
    chain(task_one.s(arg1, arg2), task_two.s(arg1, arg2)).apply_async()

So, first task taking 2 Arguments and in the end Populating some data to PostgreSQL table. After that second task should Start, get data from FIRST table , generate new calculations and post them to SECOND PostgreSQL table.

The problem what I see with my code that its populating all data to first table, but second one is empty. I tried different variations with Chord and Groups and its still does not work.

Let me know what you think and Please be specific. Thank you.

PS I did check Celery documentation!, please don't just post link to it.

Answer 1

So issue was that first task was sending result of it to second task as first argument. So my second task receive 3 arguments instead of two and give error. To avoid it make second task as si which mean not accept any arguments from previous tasks and it will work:

def celery_run_tasks():
    chain(task_one(arg1, arg2), task_two.si(arg1, arg2)).apply_async()