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https://issues.apache.org/jira/browse/KAFKA-7114?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16569065#comment-16569065
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Matt Wang commented on KAFKA-7114:
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[~soundari] you can open the debug log of consumer client, then you can see
what is the consumer doing when it can not consume msgs.
> Kafka Not sending few partitions messages to consumers
> ------------------------------------------------------
>
> Key: KAFKA-7114
> URL: https://issues.apache.org/jira/browse/KAFKA-7114
> Project: Kafka
> Issue Type: Bug
> Components: consumer
> Affects Versions: 1.1.0
> Reporter: Gnanasoundari
> Priority: Blocker
>
> *Infrastructure:*
> Kafka is running in cluster mode with 3 brokers and 3 zookeeper instances.
> Kafka broker is running in t2.xlarge AWS instance.
> 3 Zookeeper instances is running in single t2.xlarge AWS instance.
> Kafka Version: 1.1.0
> *Issue:*
> Kafka is not sending messages to consumer though the consumer is still active
> and subscribed to the partition.
> *How to reproduce:*
> * Continuously send 50,000 records/sec where each record size is about 200
> bytes approx. for 24hour duration.
> * We have 25 topics with 4 partitions each. All 25 topics are consumed by 4
> consumers with auto assignment of partition by kafka.
> * Kafka clears all records in partitions except 2 partitions. For two
> partitions , only 27 messages are delivered. Remaining messages has not
> delivered to consumer.
> * During the run kafka brokers cpu utilization is 5%
> Problematic partitions details:
> |TOPIC|PARTITION|CURRENT-OFFSET|LOG-END-OFFSET|LAG|CONSUMER-ID|HOST|CLIENT-ID|
> |topic-di14|3|27|3919844|3919817|consumer-7-dfaf4c6f-5b71-455e-ab12-9984446a9bf4|/10.10.9.22|consumer-7|
> |topic-di9|0|27|12231117|12231090|consumer-22-7922babd-8f8b-49db-a111-df523962cca8|/10.10.9.22|consumer-22|
> I am not able to see any error in kafka as well as my consumer application.
> Consumer is active when i ran ./bin/kafka-consumer-groups.sh command in
> kafka.
>
> *Kafka Consumer settings:*
> enable.auto.commit = true
> session.timeout.ms = 90000
> heartbeat.interval.ms = 30000
> max.poll.records = 1000
> poll-interval = 60ms
> poll-timeout = 60ms
>
> Please help us to know why this behavior is happening in kafka.
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