If you confirm it's the reason, then try to increase `num.replica.fetchers` to speed up the replication.
________________________________ 发件人: 蔡高年 <838199...@qq.com> 发送时间: 2017年5月11日 11:45 收件人: users 主题: 0.10.1.0 version kafka replica syn slow hello recently ,our prod environment have a proplem,the kafka leader Shrinking and Expanding IsR frequently,result in the consumer can not consume the message.do you have any advice? thank you. here is the log related. [serviceop@SZC-L0046001 kafka]$ ./bin/kafka-topics.sh --describe --zookeeper 30.16.36.181:2181,30.16.36.182:2181,30.16.36.183:2181/ubasKafka --topic kafkaUbasTopicProd Topic:kafkaUbasTopicProd PartitionCount:8 ReplicationFactor:3 Configs: Topic: kafkaUbasTopicProd Partition: 0 Leader: 1 Replicas: 1,7,0 Isr: 1,7,0 Topic: kafkaUbasTopicProd Partition: 1 Leader: 2 Replicas: 2,0,1 Isr: 1,2,0 Topic: kafkaUbasTopicProd Partition: 2 Leader: 3 Replicas: 3,1,2 Isr: 1,2,3 Topic: kafkaUbasTopicProd Partition: 3 Leader: 4 Replicas: 4,2,3 Isr: 2,3,4 Topic: kafkaUbasTopicProd Partition: 4 Leader: 5 Replicas: 5,3,4 Isr: 3,4,5 Topic: kafkaUbasTopicProd Partition: 5 Leader: 6 Replicas: 6,4,5 Isr: 4,5,6 Topic: kafkaUbasTopicProd Partition: 6 Leader: 7 Replicas: 7,5,6 Isr: 5,6,7 Topic: kafkaUbasTopicProd Partition: 7 Leader: 0 Replicas: 0,6,7 Isr: 0 [2017-05-09 18:28:34,533] INFO Partition [kafkaUbasTopicProd,7] on broker 0: Expanding ISR for partition [kafkaUbasTopicProd,7] from 0 to 0,6 (kafka.cluster.Partition) [2017-05-09 18:28:53,901] INFO Partition [kafkaUbasTopicProd,7] on broker 0: Shrinking ISR for partition [kafkaUbasTopicProd,7] from 0,6 to 0 (kafka.cluster.Partition) [2017-05-09 18:33:03,901] INFO Partition [__consumer_offsets,2] on broker 0: Shrinking ISR for partition [__consumer_offsets,2] from 0,5,6 to 0,5 (kafka.cluster.Partition) [2017-05-09 18:33:03,903] INFO Partition [__consumer_offsets,10] on broker 0: Shrinking ISR for partition [__consumer_offsets,10] from 0,6,7 to 0,7 (kafka.cluster.Partition)