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A quick question on unlogged batch

Hi All,

What's the difference between logged batch and unlogged batch? I'm asking this question it's because I'm seeing the below WARNINGs after a new app started writting to the cluster. 

WARNING in system.log:
Unlogged batch covering 135 partitions detected against table [cargts.eventdata]. You should use a logged batch for atomicity, or asynchronous writes for performance

Best regards,