Consumer groups

This page just details out the possible scenarios where the number of partitions and consumers in a consumer group may differ. 

 

 If the number of consumers is less than the number of topic partitions, then multiple partitions can be assigned to one of the consumers in the group 

 

 

 

 If the number of consumers is the same as the number of topic partitions, then partition and consumer will be mapped one to one, one possible mapping can be 

 

 

 

 If the number of consumers is higher than the number of topic partitions, then partition and consumer will be mapped one to one as well, except those consumers without a partition will just be idling without a partition to consume from.