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

mukesh.modi.india_53022 avatar image
mukesh.modi.india_53022 asked ·

how write in cassandra works in terms of commitlog_segment_size_in_mb

Hi Team,

We caught the error "Mutation of 17156436 bytes is too large for the maximum size of 16777216" in Cassandra.

I understand, we should increase the commitlog_segment_size_in_mb to 64 mb as mutation usually use 1/2 of commilog_segment_size and we were using 32 mb.

Now, I understand, how commitlog_segment_size_in_mb works.

Is it because the size of writes has increased, or is it because commitlog has increased because the size of writes went high? I mean multiple writes in commitlog or one write request which has more than 16mb of size.


Thanks in advance.


Cheers,

Mukesh kumar

commitlogscommitlog_segment_size
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1 Answer

Erick Ramirez avatar image
Erick Ramirez answered ·

@mukesh.modi.india_53022 you are getting that error because the application is sending a really large write. We do not recommend increasing the commitlog segment size unless you fully understand the implications. Cheers!

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