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From "Luke Stephenson (Jira)" <j...@apache.org>
Subject [jira] [Created] (KAFKA-8900) Stalled partitions
Date Thu, 12 Sep 2019 04:24:00 GMT
Luke Stephenson created KAFKA-8900:

             Summary: Stalled partitions
                 Key: KAFKA-8900
                 URL: https://issues.apache.org/jira/browse/KAFKA-8900
             Project: Kafka
          Issue Type: Bug
          Components: core
    Affects Versions: 2.1.1
            Reporter: Luke Stephenson

I'm seeing behaviour where a Scala KafkaConsumer has stalled for 1 partition for a topic.
 All other partitions for that topic are successfully being consumed.

Restarting the consumer process does not resolve the issue.  The consumer is using version
2.3.0 ("org.apache.kafka" % "kafka-clients" % "2.3.0").

When the consumer starts, I see that it is assigned the partition.  However it then logs:
[Consumer clientId=kafka-bus-router-64c88855cf-hxck7.event-bus-router-consumer.1d1ed7ee-5038-4441-84eb-8080ac130e9a,
groupId=event-bus-router] Setting offset for partition maxwell.transactions-22 to the committed
offset FetchPosition{offset=275413397, offsetEpoch=Optional[271], currentLeader=LeaderAndEpoch{leader=:-1
(id: -1 rack: null), epoch=271}}

Note that the leader is logged as "-1".  If I search through my application logs for the past
couple of days, the only time I ever see this logged on the consumer is for this partition.

The kafka broker is running version 2.1.1.  On the broker side the logs show:
id=5] Ignoring LeaderAndIsr request from controller 4 with correlation id 15943 epoch 155
for partition maxwell.transactions-22 since its associated leader epoch 270 is not higher
than the current leader epoch 270","endOfBatch":false,"loggerFqcn":"org.slf4j.impl.Log4jLoggerAdapter","threadId":72,"threadPriority":5}
on broker 5] Removed fetcher for partitions Set(maxwell.transactions-22)","endOfBatch":false,"loggerFqcn":"org.slf4j.impl.Log4jLoggerAdapter","threadId":72,"threadPriority":5}
maxwell.transactions-22 broker=5] maxwell.transactions-22 starts at Leader Epoch 271 from
offset 275403423. Previous Leader Epoch was: 270","endOfBatch":false,"loggerFqcn":"org.slf4j.impl.Log4jLoggerAdapter","threadId":72,"threadPriority":5}
id=5] Skipped the become-leader state change after marking its partition as leader with correlation
id 15945 from controller 4 epoch 155 for partition maxwell.transactions-22 (last update controller
epoch 155) since it is already the leader for the partition.","endOfBatch":false,"loggerFqcn":"org.slf4j.impl.Log4jLoggerAdapter","threadId":72,"threadPriority":5}

As soon as I restart the broker which is the leader for that partition, the messages flow
through to the consumer.

Given restarts of the consumer don't help, but restarting the broker allows the stalled partition
to resume, I'm inclined to think this is an issue with the broker.  Please let me know if
I can assist further with investigating or resolving this.

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