Django Celery Error When Starting CeleryBeat - Cannot Add Item To Database

Question

I've set up a Django project through Apache using mod_wsgi, and I'm now trying to add django-celery to the mix to run periodic and scheduled tasks. I'm running into occasional error messages, though, but I haven't found an explanation for what they mean.

When I start up Celerybeat using:

./manage.py celery beat

I often get one of the two following errors:

Message Error: cannot add item to database

celerybeat raised exception <class 'dbm.error'>: error('cannot add item to database',)

I can see that celerybeat generates two files in the project directory: celerybeat-schedule.dir and celerybeat-schedule.pag. I'm pretty sure these files are the "database" mentioned in the error message. If I delete these files, Celerybeat will usually run without problems for a couple times, but then the errors come back.

Is there something that I need to do with the celerybeat-schedule files to avoid this error? I thought it might be a permissions issue, but I couldn't see any issues.

remove this file: celerybeat-schedule.db

anwar
– anwar

2018-05-20 12:18:55 +00:00
Commented May 20, 2018 at 12:18 — anwar
– anwar, Commented May 20, 2018 at 12:18

Pengfei.X · Accepted Answer · 2018-06-21 04:17:33Z

29

just rm celerybeat.db, and start you celerybeat again will work

answered Jun 21, 2018 at 4:17

Pengfei.X

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1 Comment

Shivanshu Over a year ago

This worked. Seems what I did wrong was to purge running beat instance in htop using SIGKILL. But I when used SIGTERM, no such issue.

themylogin · Accepted Answer · 2016-09-13 18:27:16Z

0

I was able to fix this by installing python3-gdbm (or python3-dbm) package and re-creating schedule file.

answered Sep 13, 2016 at 18:27

themylogin

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scum · Accepted Answer · 2014-05-06 02:45:49Z

-1

Had the same issue and was not able to figure it out.

A workaround is to use the database to store the schedules:

celery -A proj beat -S djcelery.schedulers.DatabaseScheduler

You'll need to pip install django-celery and update your database if you go this route.

answered May 6, 2014 at 2:45

scum

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