问题
Whats the default behavior of kafka (version 0.10) consumer if it tries to rejoin the consumer group. I am using a single consumer for a consumer group but it seems like it got struck at rejoining. After each 10 min it print following line in consumer logs.
2016-08-11 13:54:53,803 INFO o.a.k.c.c.i.ConsumerCoordinator [pool-5-thread-1] ****Revoking previously assigned partitions**** [] for group image-consumer-group
2016-08-11 13:54:53,803 INFO o.a.k.c.c.i.AbstractCoordinator [pool-5-thread-1] (Re-)joining group image-consumer-group
2016-08-11 14:04:53,992 INFO o.a.k.c.c.i.AbstractCoordinator [pool-5-thread-1] Marking the coordinator dead for group image-consumer-group
2016-08-11 14:04:54,095 INFO o.a.k.c.c.i.AbstractCoordinator [pool-5-thread-1] Discovered coordinator for group image-consumer-group.
2016-08-11 14:04:54,096 INFO o.a.k.c.c.i.AbstractCoordinator [pool-5-thread-1] (Re-)joining group image-consumer-group
Restart consumer application is not helping.
回答1:
If you're gonna to have only one consumer instance in a group, then use the consumer with manual assignment strategy. (Simple Consumer).
Manual topic assignment does not use the consumer's group management functionality so heart beats are not required.
来源：https://stackoverflow.com/questions/38891740/kafka-consumer-stuck-in-re-joining-group