How can I safely reset Hangfire to a clean state?

Question

I have a server with Hangfire installed. I haven't checked it for a while and it seems one recurring job has gone rogue. It stopped working and then it has stacked up with retries resulting in a complete lock it seems.

I would like to clear my database and start over. Can i just delete the data from all tables or should I drop the tables and let Hangfire recreate them for me? Am I risking anything by doing this?

Hangfire.State using entire Azure Basic database 2GB of space.

Answer 1

I ended up dropping the tables, at first the query did not work at all, it just kept going and nothing happened. I then used TRUNCATE TABLE [HangFire].[State] and it all worked like a charm after. Here is the script I used for Hangfire 1.5.6 with UseSqlServerStorage:

GO
PRINT N'Dropping [HangFire].[FK_HangFire_State_Job]...';


GO
ALTER TABLE [HangFire].[State] DROP CONSTRAINT [FK_HangFire_State_Job];


GO
PRINT N'Dropping [HangFire].[FK_HangFire_JobParameter_Job]...';


GO
ALTER TABLE [HangFire].[JobParameter] DROP CONSTRAINT [FK_HangFire_JobParameter_Job];


GO
PRINT N'Dropping [HangFire].[Schema]...';


GO
DROP TABLE [HangFire].[Schema];


GO
PRINT N'Dropping [HangFire].[Job]...';


GO
DROP TABLE [HangFire].[Job];


GO
PRINT N'Dropping [HangFire].[State]...';


GO
DROP TABLE [HangFire].[State];


GO
PRINT N'Dropping [HangFire].[JobParameter]...';


GO
DROP TABLE [HangFire].[JobParameter];


GO
PRINT N'Dropping [HangFire].[JobQueue]...';


GO
DROP TABLE [HangFire].[JobQueue];


GO
PRINT N'Dropping [HangFire].[Server]...';


GO
DROP TABLE [HangFire].[Server];


GO
PRINT N'Dropping [HangFire].[List]...';


GO
DROP TABLE [HangFire].[List];


GO
PRINT N'Dropping [HangFire].[Set]...';


GO
DROP TABLE [HangFire].[Set];


GO
PRINT N'Dropping [HangFire].[Counter]...';


GO
DROP TABLE [HangFire].[Counter];


GO
PRINT N'Dropping [HangFire].[Hash]...';


GO
DROP TABLE [HangFire].[Hash];


GO
PRINT N'Dropping [HangFire].[AggregatedCounter]...';


GO
DROP TABLE [HangFire].[AggregatedCounter];


GO
PRINT N'Dropping [HangFire]...';


GO
DROP SCHEMA [HangFire];


GO
PRINT N'Update complete.';


GO

Answer 2

I've seen a pretty interesting solution here

TRUNCATE TABLE [HangFire].[AggregatedCounter]
TRUNCATE TABLE [HangFire].[Counter]
TRUNCATE TABLE [HangFire].[JobParameter]
TRUNCATE TABLE [HangFire].[JobQueue]
TRUNCATE TABLE [HangFire].[List]
TRUNCATE TABLE [HangFire].[State]
DELETE FROM [HangFire].[Job]
DBCC CHECKIDENT ('[HangFire].[Job]', reseed, 0)
UPDATE [HangFire].[Hash] SET Value = 1 WHERE Field = 'LastJobId'

This basically truncates all the tables and resets the seeding for the Job table (reseting job id's)

I think it's also worth mentioning that it is good and sensible practice to stop your application and make sure the worker processes have cleared up on your server before running any scripts