[jira] [Created] (KAFKA-6539) KafkaConsumer endlessly try to connect to a dead broker, ignoring brokers alive

["Song Younghwan (JIRA)" <ji...@apache.org>]

Song Younghwan created KAFKA-6539:
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             Summary: KafkaConsumer endlessly try to connect to a dead broker, ignoring brokers alive
                 Key: KAFKA-6539
                 URL: https://issues.apache.org/jira/browse/KAFKA-6539
             Project: Kafka
          Issue Type: Bug
          Components: consumer
    Affects Versions: 1.0.0
         Environment: Java 8
Brokers on CentOS 7.4
Consumers on Windows 10
            Reporter: Song Younghwan
         Attachments: consumer.log

I consider to use Kafka in my company, so currently doing failover test.

Conditions:
 * org.apache.kafka:kafka-clients:1.0.0
 * New consumer using bootstrap.servers, a consumer group and a group coordinator
 * num. brokers = 3 (id #1, #2, #3)
 * Topic num. partitions = 3, replication factor = 3
 * offsets.topic.replication.factor = 3

Reproduction Step:
 # Run consumers in the same consumer group, each of them subscribe to a topic
 # Kill (kill -9) #1, #2 broker simultaneously (only #3 online)
 # Consumers eventually connect to #3 broker
 # Start #1, #2 broker again after a while (#1, #2, #3 online)
 # Kill (kill -9) #2, #3 broker simultaneously (only #1 online)
 # *{color:#FF0000}Now consumers endlessly try to connect to #3 broker only{color}*
 # Start #2 broker again after a while (#1, #2 online)
 # *{color:#FF0000}Consumers still blindly try to connect to #3 broker{color}*

Expectation:

Consumers successfully connect to #1 broker after step 5.

Record:

I attached a consumer log file with TRACE log level. Related events below:
 * 12:03:13 kills #1, #2 broker simultaneously
 * 12:03:42 starts #1, #2 broker again
 * 12:04:01 kills #2, #3 broker simultaneously
 * 12:04:42 starts #2 broker again

 



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