DataStax Academy FAQ

DataStax Academy migrated to a new learning management system (LMS) in July 2020. We are also moving to a new Cassandra Certification process so there are changes to exam bookings, voucher system and issuing of certificates.

Check out the Academy FAQ pages for answers to your questions:


question

adityajain22_141041 avatar image
adityajain22_141041 asked ·

What is the PERIODIC-COMMIT-LOG-SYNCER warning in the logs?

We received WARN message in system.log


WARN [PERIODIC-COMMIT-LOG-SYNCER] 2020-01-07 11:19:02,321 NoSpamLogger.java:94 - Out of 0 commit log syncs over the past 0.00s with average duration of Infinityms, 1 have exceeded the configured commit interval by an average of 34.55ms
commitlog
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1 Answer

Erick Ramirez avatar image
Erick Ramirez answered ·

@adityajain22_141041 If you're seeing the warning in the logs on its own, I wouldn't be too worried about it. But if you're seeing dropped mutations as well, it means the commitlog disk cannot keep up with the writes meaning the node is overloaded.

As with your other question you just posted, you need to either throttle the traffic to the cluster or add more nodes to increase capacity. Cheers!

[UPDATE] I have published details fn the PERIODIC-COMMIT-LOG-SYNCER and cause of the false warning messages in question #6942.

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[Follow up question posted in #6942]

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