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https://issues.apache.org/jira/browse/KAFKA-4616?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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sandeep kumar singh updated KAFKA-4616:
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Summary: Message loss is seen when kafka-producer-perf-test.sh is running
and any broker restarted in middle (was: Message log is seen when
kafka-producer-perf-test.sh is running and any broker restarted in middle
in-between )
> Message loss is seen when kafka-producer-perf-test.sh is running and any
> broker restarted in middle
> ---------------------------------------------------------------------------------------------------
>
> Key: KAFKA-4616
> URL: https://issues.apache.org/jira/browse/KAFKA-4616
> Project: Kafka
> Issue Type: Bug
> Components: core
> Affects Versions: 0.10.0.0
> Environment: Apache mesos
> Reporter: sandeep kumar singh
>
> if any broker is restarted while kafka-producer-perf-test.sh command is
> running, we see message loss.
> commands i run:
> **perf command:
> $ bin/kafka-producer-perf-test.sh --num-records 100000 --record-size 4096
> --throughput 1000 --topic test3R3P3 --producer-props
> bootstrap.servers=x.x.x.x:xxxx,x.x.x.x:xxxx,x.x.x.x:xxxx
> I am sending 100000 messages of each having size 4096
> error thrown by perf command:
> 4944 records sent, 988.6 records/sec (3.86 MB/sec), 31.5 ms avg latency,
> 433.0 max latency.
> 5061 records sent, 1012.0 records/sec (3.95 MB/sec), 67.7 ms avg latency,
> 798.0 max latency.
> 5001 records sent, 1000.0 records/sec (3.91 MB/sec), 49.0 ms avg latency,
> 503.0 max latency.
> 5001 records sent, 1000.2 records/sec (3.91 MB/sec), 37.3 ms avg latency,
> 594.0 max latency.
> 5001 records sent, 1000.2 records/sec (3.91 MB/sec), 32.6 ms avg latency,
> 501.0 max latency.
> 5000 records sent, 999.8 records/sec (3.91 MB/sec), 49.4 ms avg latency,
> 516.0 max latency.
> org.apache.kafka.common.errors.NetworkException: The server disconnected
> before a response was received.
> org.apache.kafka.common.errors.NetworkException: The server disconnected
> before a response was received.
> org.apache.kafka.common.errors.NetworkException: The server disconnected
> before a response was received.
> ....truncated
> 5001 records sent, 1000.2 records/sec (3.91 MB/sec), 33.9 ms avg latency,
> 497.0 max latency.
> 4928 records sent, 985.6 records/sec (3.85 MB/sec), 42.1 ms avg latency,
> 521.0 max latency.
> 5073 records sent, 1014.4 records/sec (3.96 MB/sec), 39.4 ms avg latency,
> 418.0 max latency.
> 100000 records sent, 999.950002 records/sec (3.91 MB/sec), 37.65 ms avg
> latency, 798.00 ms max latency, 1 ms 50th, 260 ms 95th, 411 ms 99th, 571 ms
> 99.9th.
> **consumer command:
> $ bin/kafka-console-consumer.sh --zookeeper
> x.x.x.x:2181/dcos-service-kafka-framework --topic test3R3P3
> 1>~/kafka_output.log
> message stored:
> $ wc -l ~/kafka_output.log
> 99932 /home/montana/kafka_output.log
> I found only 99932 message are stored and 68 messages are lost.
> **topic describe command:
> $ bin/kafka-topics.sh --zookeeper x.x.x.x:2181/dcos-service-kafka-framework
> --describe |grep test3R3
> Topic:test3R3P3 PartitionCount:3 ReplicationFactor:3 Configs:
> Topic: test3R3P3 Partition: 0 Leader: 2 Replicas:
> 1,2,0 Isr: 2,0,1
> Topic: test3R3P3 Partition: 1 Leader: 2 Replicas:
> 2,0,1 Isr: 2,0,1
> Topic: test3R3P3 Partition: 2 Leader: 0 Replicas:
> 0,1,2 Isr: 2,0,1
> **consumer group command:
> $ bin/kafka-consumer-groups.sh --zookeeper
> x.x.x.x:2181/dcos-service-kafka-framework --describe --group
> console-consumer-9926
> GROUP TOPIC PARTITION
> CURRENT-OFFSET LOG-END-OFFSET LAG OWNER
> console-consumer-9926 test3R3P3 0
> 33265 33265 0
> console-consumer-9926_node-44a8422fe1a0-1484127474935-c795478e-0
> console-consumer-9926 test3R3P3 1
> 33334 33334 0
> console-consumer-9926_node-44a8422fe1a0-1484127474935-c795478e-0
> console-consumer-9926 test3R3P3 2
> 33333 33333 0
> console-consumer-9926_node-44a8422fe1a0-1484127474935-c795478e-0
> could you please help me understand what this error means "err -
> org.apache.kafka.common.errors.NetworkException: The server disconnected
> before a response was received."?
> Could you please provide suggestion to fix this issue?
> we are seeing this behavior every-time we perform above test-scenario.
> my understanding is, there should not any data loss till n-1 broker is alive.
> is message loss is an expected behavior in the above case?
> thanks
> Sandeep
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