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https://issues.apache.org/jira/browse/CAMEL-14010?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16936870#comment-16936870
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Andrea Cosentino commented on CAMEL-14010:
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please don't change the priority.
> Camel-Kafka ConsumerCount drops to 1 (default) from the defined value
> ---------------------------------------------------------------------
>
> Key: CAMEL-14010
> URL: https://issues.apache.org/jira/browse/CAMEL-14010
> Project: Camel
> Issue Type: Bug
> Components: camel-kafka
> Affects Versions: 2.22.0
> Reporter: Srikant Mantha
> Priority: Major
>
> Iam using kafka consumer in our application integrated with Camel.
> We consume the messages and send the data to the server for processing.
> There is one topic "XYZ" defined with 30 partitions and I have assigned 15 as
> consumer count on each consumer node (total 2 instances)
> /*** Camel Consumer Configuration ***/
> {code:java}
> kafka.consumersCount=15
> kafka.consumerStreams=15{code}
> {{I see from the logs that when the consumer starts, there are 15 consumer
> threads (lets say on 1 node), which is good as configured.I see from the logs
> that when the consumer starts, there are 15 consumer threads (lets say on 1
> node), which is good as configured.}}
> {code:java}
> INFO Camel (camel-1) thread #2 - KafkaConsumer[XYZ]
> [camel.component.kafka.KafkaConsumer(doRun:222)] Subscribing XYZ-Thread 0 to
> topic XYZ
> INFO Camel (camel-1) thread #3 - KafkaConsumer[XYZ]
> [camel.component.kafka.KafkaConsumer(doRun:222)] Subscribing XYZ-Thread 1 to
> topic XYZ
> INFO Camel (camel-1) thread #4 - KafkaConsumer[XYZ]
> [camel.component.kafka.KafkaConsumer(doRun:222)] Subscribing XYZ-Thread 2 to
> topic XYZ
> INFO Camel (camel-1) thread #5 - KafkaConsumer[XYZ]
> [camel.component.kafka.KafkaConsumer(doRun:222)] Subscribing XYZ-Thread 3 to
> topic XYZ INFO Camel (camel-1) thread #6 - KafkaConsumer[XYZ]
> [camel.component.kafka.KafkaConsumer(doRun:222)] Subscribing XYZ-Thread 4 to
> topic XYZ INFO Camel (camel-1) thread #7 - KafkaConsumer[XYZ]
> [camel.component.kafka.KafkaConsumer(doRun:222)] Subscribing XYZ-Thread 5 to
> topic XYZ INFO Camel (camel-1) thread #8 - KafkaConsumer[XYZ]
> [camel.component.kafka.KafkaConsumer(doRun:222)] Subscribing XYZ-Thread 6 to
> topic XYZ INFO Camel (camel-1) thread #9 - KafkaConsumer[XYZ]
> [camel.component.kafka.KafkaConsumer(doRun:222)] Subscribing XYZ-Thread 7 to
> topic XYZ INFO Camel (camel-1) thread #10 - KafkaConsumer[XYZ]
> [camel.component.kafka.KafkaConsumer(doRun:222)] Subscribing XYZ-Thread 8 to
> topic XYZ INFO Camel (camel-1) thread #11 - KafkaConsumer[XYZ]
> [camel.component.kafka.KafkaConsumer(doRun:222)] Subscribing XYZ-Thread 9 to
> topic XYZ INFO Camel (camel-1) thread #12 - KafkaConsumer[XYZ]
> [camel.component.kafka.KafkaConsumer(doRun:222)] Subscribing XYZ-Thread 10 to
> topic XYZ INFO Camel (camel-1) thread #13 - KafkaConsumer[XYZ]
> [camel.component.kafka.KafkaConsumer(doRun:222)] Subscribing XYZ-Thread 11 to
> topic XYZ INFO Camel (camel-1) thread #14 - KafkaConsumer[XYZ]
> [camel.component.kafka.KafkaConsumer(doRun:222)] Subscribing XYZ-Thread 12 to
> topic XYZ INFO Camel (camel-1) thread #15 - KafkaConsumer[XYZ]
> [camel.component.kafka.KafkaConsumer(doRun:222)] Subscribing XYZ-Thread 13 to
> topic XYZ INFO Camel (camel-1) thread #16 - KafkaConsumer[XYZ]
> [camel.component.kafka.KafkaConsumer(doRun:222)] Subscribing XYZ-Thread 14 to
> topic XYZ{code}
> If server stops responding due to network issue or any other scenario when
> the server is unavailable.If server stops responding due to network issue or
> any other scenario when the server is unavailable.All the kafka consumers
> starts unsubscribing which is again an expected behavior (so far good)
> Note: We have also define the Camel
> {code:java}
> ThrottlingExceptionRoutePolicy {code}
> which does a health check call on the server before sending the consumed
> message.
> Once the server is back and available, I see that not all 15 consumer
> threads are active, but only 1 (I guess this is the default value).
> From the logs below, I observe that its getting subscribed and unsubscribed
> one by one and finally the application runs with only a single consumer count.
> {code:java}
> INFO Camel (camel-1) thread #17 - KafkaConsumer[XYZ]
> [camel.component.kafka.KafkaConsumer(doRun:222)] Subscribing XYZ-Thread 0 to
> topic XYZ INFO [kafka.clients.consumer.ConsumerConfig(logAll:238)]
> ConsumerConfig values: Prints all the consumer config values
> defined/undefined auto.commit.interval.ms = 5000 auto.offset.reset = latest
> bootstrap.servers = [ListOfDefinedServers] check.crcs = true client.id =
> connections.max.idle.ms = 540000 enable.auto.commit = false
> exclude.internal.topics = true fetch.max.bytes = 52428800 fetch.max.wait.ms =
> 500 fetch.min.bytes = 1 group.id = XYZ-GroupId-12345 heartbeat.interval.ms =
> 3000 interceptor.classes = null internal.leave.group.on.close = true
> isolation.level = read_uncommitted key.deserializer = class
> org.apache.kafka.common.serialization.StringDeserializer
> max.partition.fetch.bytes = 1048576 max.poll.interval.ms = 300000
> max.poll.records = 500 metadata.max.age.ms = 5000 metric.reporters = []
> metrics.num.samples = 2 metrics.recording.level = INFO
> metrics.sample.window.ms = 30000 partition.assignment.strategy =
> [org.apache.kafka.clients.consumer.RangeAssignor] receive.buffer.bytes =
> 65536 reconnect.backoff.max.ms = 1000 reconnect.backoff.ms = 50
> request.timeout.ms = 40000 retry.backoff.ms = 100 sasl.jaas.config = null
> sasl.kerberos.kinit.cmd = /usr/bin/kinit
> sasl.kerberos.min.time.before.relogin = 60000 sasl.kerberos.service.name =
> null sasl.kerberos.ticket.renew.jitter = 0.05
> sasl.kerberos.ticket.renew.window.factor = 0.8 sasl.mechanism = GSSAPI
> security.protocol = SSL send.buffer.bytes = 131072 session.timeout.ms = 10000
> ssl.cipher.suites = null ssl.enabled.protocols = [TLSv1.2, TLSv1.1, TLSv1]
> ssl.endpoint.identification.algorithm = HTTPS ssl.key.password = [hidden]
> ssl.keymanager.algorithm = SunX509 ssl.keystore.location = cert.jks
> ssl.keystore.password = [hidden] ssl.keystore.type = JKS ssl.protocol = TLS
> ssl.provider = null ssl.secure.random.implementation = null
> ssl.trustmanager.algorithm = PKIX ssl.truststore.location = cert.jks
> ssl.truststore.password = [hidden] ssl.truststore.type = JKS
> value.deserializer = class
> org.apache.kafka.common.serialization.StringDeserializer INFO Camel
> (camel-1) thread #17 - KafkaConsumer[XYZ]
> [camel.component.kafka.KafkaConsumer(doRun:351)] Unsubscribing XYZ-Thread 0
> from topic XYZ INFO [kafka.clients.consumer.ConsumerConfig(logAll:238)]
> ConsumerConfig values: Prints all the consumer config values defined/undefined
> INFO Camel (camel-1) thread #18 - KafkaConsumer[XYZ]
> [camel.component.kafka.KafkaConsumer(doRun:222)] Subscribing XYZ-Thread 1 to
> topic XYZ INFO [kafka.clients.consumer.ConsumerConfig(logAll:238)]
> ConsumerConfig values: Prints all the consumer config values
> defined/undefined INFO Camel (camel-1) thread #18 - KafkaConsumer[XYZ]
> [camel.component.kafka.KafkaConsumer(doRun:351)] Unsubscribing XYZ-Thread 1
> from topic XYZ INFO [kafka.clients.consumer.ConsumerConfig(logAll:238)]
> ConsumerConfig values: Prints all the consumer config values defined/undefined
> INFO Camel (camel-1) thread #19 - KafkaConsumer[XYZ]
> [camel.component.kafka.KafkaConsumer(doRun:222)] Subscribing XYZ-Thread 2 to
> topic XYZ INFO [kafka.clients.consumer.ConsumerConfig(logAll:238)]
> ConsumerConfig values: Prints all the consumer config values
> defined/undefined INFO Camel (camel-1) thread #19 - KafkaConsumer[XYZ]
> [camel.component.kafka.KafkaConsumer(doRun:351)] Unsubscribing XYZ-Thread 2
> from topic XYZ INFO [kafka.clients.consumer.ConsumerConfig(logAll:238)]
> ConsumerConfig values: Prints all the consumer config values defined/undefined
> INFO Camel (camel-1) thread #20 - KafkaConsumer[XYZ]
> [camel.component.kafka.KafkaConsumer(doRun:222)] Subscribing XYZ-Thread 3 to
> topic XYZ INFO [kafka.clients.consumer.ConsumerConfig(logAll:238)]
> ConsumerConfig values: Prints all the consumer config values
> defined/undefined INFO Camel (camel-1) thread #20 - KafkaConsumer[XYZ]
> [camel.component.kafka.KafkaConsumer(doRun:351)] Unsubscribing XYZ-Thread 3
> from topic XYZ INFO [kafka.clients.consumer.ConsumerConfig(logAll:238)]
> ConsumerConfig values: Prints all the consumer config values defined/undefined
> INFO Camel (camel-1) thread #21 - KafkaConsumer[XYZ]
> [camel.component.kafka.KafkaConsumer(doRun:222)] Subscribing XYZ-Thread 4 to
> topic XYZ INFO [kafka.clients.consumer.ConsumerConfig(logAll:238)]
> ConsumerConfig values: Prints all the consumer config values
> defined/undefined INFO Camel (camel-1) thread #21 - KafkaConsumer[XYZ]
> [camel.component.kafka.KafkaConsumer(doRun:351)] Unsubscribing XYZ-Thread 4
> from topic XYZ INFO [kafka.clients.consumer.ConsumerConfig(logAll:238)]
> ConsumerConfig values: Prints all the consumer config values defined/undefined
> INFO Camel (camel-1) thread #22 - KafkaConsumer[XYZ]
> [camel.component.kafka.KafkaConsumer(doRun:222)] Subscribing XYZ-Thread 5 to
> topic XYZ INFO [kafka.clients.consumer.ConsumerConfig(logAll:238)]
> ConsumerConfig values: Prints all the consumer config values
> defined/undefined INFO Camel (camel-1) thread #22 - KafkaConsumer[XYZ]
> [camel.component.kafka.KafkaConsumer(doRun:351)] Unsubscribing XYZ-Thread 5
> from topic XYZ INFO [kafka.clients.consumer.ConsumerConfig(logAll:238)]
> ConsumerConfig values: Prints all the consumer config values defined/undefined
> INFO Camel (camel-1) thread #23 - KafkaConsumer[XYZ]
> [camel.component.kafka.KafkaConsumer(doRun:222)] Subscribing XYZ-Thread 6 to
> topic XYZ INFO [kafka.clients.consumer.ConsumerConfig(logAll:238)]
> ConsumerConfig values: Prints all the consumer config values
> defined/undefined INFO Camel (camel-1) thread #23 - KafkaConsumer[XYZ]
> [camel.component.kafka.KafkaConsumer(doRun:351)] Unsubscribing XYZ-Thread 6
> from topic XYZ INFO [kafka.clients.consumer.ConsumerConfig(logAll:238)]
> ConsumerConfig values: Prints all the consumer config values defined/undefined
> INFO Camel (camel-1) thread #24 - KafkaConsumer[XYZ]
> [camel.component.kafka.KafkaConsumer(doRun:222)] Subscribing XYZ-Thread 7 to
> topic XYZ INFO [kafka.clients.consumer.ConsumerConfig(logAll:238)]
> ConsumerConfig values: Prints all the consumer config values
> defined/undefined INFO Camel (camel-1) thread #24 - KafkaConsumer[XYZ]
> [camel.component.kafka.KafkaConsumer(doRun:351)] Unsubscribing XYZ-Thread 7
> from topic XYZ INFO [kafka.clients.consumer.ConsumerConfig(logAll:238)]
> ConsumerConfig values: Prints all the consumer config values defined/undefined
> INFO Camel (camel-1) thread #25 - KafkaConsumer[XYZ]
> [camel.component.kafka.KafkaConsumer(doRun:222)] Subscribing XYZ-Thread 8 to
> topic XYZ INFO [kafka.clients.consumer.ConsumerConfig(logAll:238)]
> ConsumerConfig values: Prints all the consumer config values
> defined/undefined INFO Camel (camel-1) thread #25 - KafkaConsumer[XYZ]
> [camel.component.kafka.KafkaConsumer(doRun:351)] Unsubscribing XYZ-Thread 8
> from topic XYZ INFO [kafka.clients.consumer.ConsumerConfig(logAll:238)]
> ConsumerConfig values: Prints all the consumer config values defined/undefined
> INFO Camel (camel-1) thread #26 - KafkaConsumer[XYZ]
> [camel.component.kafka.KafkaConsumer(doRun:222)] Subscribing XYZ-Thread 9 to
> topic XYZ INFO [kafka.clients.consumer.ConsumerConfig(logAll:238)]
> ConsumerConfig values: Prints all the consumer config values
> defined/undefined INFO Camel (camel-1) thread #26 - KafkaConsumer[XYZ]
> [camel.component.kafka.KafkaConsumer(doRun:351)] Unsubscribing XYZ-Thread 9
> from topic XYZ INFO [kafka.clients.consumer.ConsumerConfig(logAll:238)]
> ConsumerConfig values: Prints all the consumer config values defined/undefined
> INFO Camel (camel-1) thread #27 - KafkaConsumer[XYZ]
> [camel.component.kafka.KafkaConsumer(doRun:222)] Subscribing XYZ-Thread 10 to
> topic XYZ INFO [kafka.clients.consumer.ConsumerConfig(logAll:238)]
> ConsumerConfig values: Prints all the consumer config values
> defined/undefined INFO Camel (camel-1) thread #27 - KafkaConsumer[XYZ]
> [camel.component.kafka.KafkaConsumer(doRun:351)] Unsubscribing XYZ-Thread 10
> from topic XYZ INFO [kafka.clients.consumer.ConsumerConfig(logAll:238)]
> ConsumerConfig values: Prints all the consumer config values defined/undefined
> INFO Camel (camel-1) thread #28 - KafkaConsumer[XYZ]
> [camel.component.kafka.KafkaConsumer(doRun:222)] Subscribing XYZ-Thread 11 to
> topic XYZ INFO [kafka.clients.consumer.ConsumerConfig(logAll:238)]
> ConsumerConfig values: Prints all the consumer config values
> defined/undefined INFO Camel (camel-1) thread #28 - KafkaConsumer[XYZ]
> [camel.component.kafka.KafkaConsumer(doRun:351)] Unsubscribing XYZ-Thread 11
> from topic XYZ INFO [kafka.clients.consumer.ConsumerConfig(logAll:238)]
> ConsumerConfig values: Prints all the consumer config values defined/undefined
> INFO Camel (camel-1) thread #29 - KafkaConsumer[XYZ]
> [camel.component.kafka.KafkaConsumer(doRun:222)] Subscribing XYZ-Thread 12 to
> topic XYZ INFO [kafka.clients.consumer.ConsumerConfig(logAll:238)]
> ConsumerConfig values: Prints all the consumer config values
> defined/undefined INFO Camel (camel-1) thread #29 - KafkaConsumer[XYZ]
> [camel.component.kafka.KafkaConsumer(doRun:351)] Unsubscribing XYZ-Thread 12
> from topic XYZ INFO [kafka.clients.consumer.ConsumerConfig(logAll:238)]
> ConsumerConfig values: Prints all the consumer config values defined/undefined
> INFO Camel (camel-1) thread #30 - KafkaConsumer[XYZ]
> [camel.component.kafka.KafkaConsumer(doRun:222)] Subscribing XYZ-Thread 13 to
> topic XYZ INFO [kafka.clients.consumer.ConsumerConfig(logAll:238)]
> ConsumerConfig values: Prints all the consumer config values
> defined/undefined INFO Camel (camel-1) thread #30 - KafkaConsumer[XYZ]
> [camel.component.kafka.KafkaConsumer(doRun:351)] Unsubscribing XYZ-Thread 13
> from topic XYZ INFO [kafka.clients.consumer.ConsumerConfig(logAll:238)]
> ConsumerConfig values: Prints all the consumer config values defined/undefined
> INFO Camel (camel-1) thread #31 - KafkaConsumer[XYZ]
> [camel.component.kafka.KafkaConsumer(doRun:222)] Subscribing XYZ-Thread 14 to
> topic XYZ INFO Camel (camel-1) thread #31 - KafkaConsumer[XYZ]
> [clients.consumer.internals.AbstractCoordinator(info:341)] [Consumer
> clientId=consumer-30, groupId=XYZ-GroupId-12345] Discovered group coordinator
> servername (id: 2147482644 rack: null) INFO Camel (camel-1) thread #31 -
> KafkaConsumer[XYZ] [clients.consumer.internals.ConsumerCoordinator(info:341)]
> [Consumer clientId=consumer-30, groupId=XYZ-GroupId-12345] Revoking
> previously assigned partitions [] INFO Camel (camel-1) thread #31 -
> KafkaConsumer[XYZ] [clients.consumer.internals.AbstractCoordinator(info:336)]
> [Consumer clientId=consumer-30, groupId=XYZ-GroupId-12345] (Re-)joining group
> INFO Camel (camel-1) thread #31 - KafkaConsumer[XYZ]
> [clients.consumer.internals.AbstractCoordinator(info:341)] [Consumer
> clientId=consumer-30, groupId=XYZ-GroupId-12345] Successfully joined group
> with generation 1 INFO Camel (camel-1) thread #31 - KafkaConsumer[XYZ]
> [clients.consumer.internals.ConsumerCoordinator(info:341)] [Consumer
> clientId=consumer-30, groupId=XYZ-GroupId-12345] Setting newly assigned
> partitions [XYZ-17, XYZ-19, XYZ-13, XYZ-15, XYZ-25, XYZ-27, XYZ-21, XYZ-23,
> XYZ-1, XYZ-3, XYZ-28, XYZ-9, XYZ-11, XYZ-5, XYZ-7, XYZ-16, XYZ-18, XYZ-12,
> XYZ-14, XYZ-24, XYZ-26, XYZ-20, XYZ-22, XYZ-0, XYZ-2, XYZ-29, XYZ-8, XYZ-10,
> XYZ-4, XYZ-6]{code}
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