Rollback Time Limit in Mongo Community Server

Ops and Admin Replication
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Hi there
We currently have the bitnami/mongodb docker image running using the community edition of Mongo Server (V 4.2).
Due to a downtime over the weekend our secondary DB cannot start due to:
Rollback failed with unrecoverable error: UnrecoverableRollbackError: not willing to roll back more than 86400 seconds of data. Have: 132368 seconds.
We tried setting the --rollbackTimeLimitSecs=2147483647 option but that doesn’t work:
Error parsing command line: unrecognised option '--rollbackTimeLimitSec=2147483647

I assume that’s due to us using the community server. Is there any workaround to that?
Thanks in advance!
Cheers,
Robin

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Welcome to the MongoDB Community Forums @Robin_Hermanek !

The rollbackTimeLimitSecs option is supported in MongoDB 4.0+. The error message suggests you have a typo in the option name (missing the s).

However, I would also note that 132368 seconds is almost 37 hours of data that will be rolled back. Before doing so, I would make sure you understand the downtime incident you had over the weekend and why this secondary appears to have diverged by 37 hours of writes.

Regards,
Stennie

3

Hi Stennie

Thanks for your reply. Sadly this is just a typo in my question, I wrote it with the s on the mongodb instance and got the error that it was not recognized. As far as i can see, the community Version does not support it or does it?
And yes I understand that it will take quite some time for the writes.

Thanks and cheers,
Robin

4

Hi @Robin_Hermanek,

I just realised rollbackTimeLimitSecs is a MongoDB Server Parameter. not a distinct command-line option.

You need to set this value using setParameter which can be done:

  • At runtime:

    db.adminCommand( { setParameter: 1, rollbackTimeLimitSecs:86400 } )

  • Via the --setParameter command-line option:

    mongod --setParameter rollbackTimeLimitSecs=86400 ...

  • Via the setParameter setting in a mongod configuration file:
    setParameter:
        rollbackTimeLimitSecs: 86400

You can use the getParameter command to check the current value:

  db.adminCommand({ getParameter: 1, rollbackTimeLimitSecs:1})

Regards,
Stennie

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