camel kafka consumercount从定义的值降至1(默认值)

ljsrvy3e  于 2021-06-04  发布在  Kafka
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iam在我们的应用程序中使用kafka consumer与camel（camel-kafka）集成。我们使用消息并将数据发送到服务器进行处理。有一个主题“xyz”定义了30个分区，我在每个用户节点上分配了15个用户计数（总共2个示例）
camelconsumer配置

kafka.consumersCount=15
kafka.consumerStreams=15

我从日志中看到，当使用者启动时，有15个使用者线程（假设在1个节点上），这与配置的一样好。

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

如果服务器不可用时由于网络问题或任何其他情况而停止响应。所有的Kafka消费者开始退订，这也是一个预期的行为（到目前为止还不错）
注意：我们还定义了camel ThrottlingExceptionRoutePolicy 它在发送消耗的消息之前对服务器执行运行状况检查调用。
一旦服务器恢复可用，我发现并不是所有15个使用者线程都处于活动状态，而是只有1个。从下面的日志中，我观察到它一个接一个地被订阅和取消订阅，最后应用程序只运行一个消费者计数。

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]

你知道为什么camel不使用定义的consumer count运行，而是只使用一个consumer运行吗。当负载更大时，这会影响使用者应用程序的处理速度。
有什么帮助或建议这里出了什么问题？
我期望在失败后运行15个使用者线程，这是camel-kafka配置中定义的。

apache-kafkakafka-consumer-apiapache-camel

2条答案

按热度按时间
kyvafyod

kyvafyod1#

我们遇到了同样的问题。
设置如下：
Spring Boot：2.2.x
camel版本：2.24.1
主题有3个分区。
kafka.ConsumerCount=3（每个分区1个）
kafka.ConsumerStreams=10[默认值]
throttlingexceptionroutepolicy-如果发生异常，请打开电路。
在camel-kafka组件中，kafkaconsumer不实现suspendable接口，即使它实现了suspendableservice接口。因此，需要关闭使用者并开始模拟挂起/恢复功能。
当你打开电路（）和关闭电路（）时会发生这种情况
kafkaconsumer（singleton）bean使用原子布尔字段started、starting、stopping、stopped、suspending、suspended、shuttingdown、shutdown来跟踪其当前状态。
一旦声明了应用程序的驼峰路由，状态就变成：kafkaconsumer{started=true，starting=false，stopping=false，stopped=false，shutdown=false}
当电路开路时，状态为：kafkaconsumer{started=false，starting=false，stopping=false，stopped=true，shutdown=false}
当启动电路闭合时，kafkaconsumer状态仍为：stopped=true，并且kafka consumer启动（恢复）过程启动。
Kafka消费者：

doStart(){
      // create executor with worker thread count = consumerStreams 
      for (int i = 0; i < endpoint.getConfiguration().getConsumersCount(); i++) {
           KafkaFetchRecords task = new KafkaFetchRecords(topic, pattern, i + "", getProps());
           // pre-initialize task during startup so if there is any error we have it thrown asap
           task.preInit();
           executor.submit(task);  
           tasks.add(task);
      }    
  }

Kafka夫档案：

doRun(){
   clientConsumer.subscribe(topic);
   while( isRunAllowed() && !reConnect && !isStoppingOrStopped() && !isSuspendingOrSuspended()){
      clientConsumer.poll();
   }
   clientConsumer.unsubscribe(topic) 
}

由于executor.submit（）会毫不延迟地触发dorun（），因此kafkaconsumer状态仍然是stopped，while循环被跳过，kafka consumer客户端结束取消订阅主题。
一旦dostart（）的for循环完成，kafkaconsumer的状态就被标记为stopped=false，started=true
因此，对于最后一个（kafkafetchrecord）任务的dorun（）调用，进入while循环，消费者继续轮询消息。
可能的解决办法是：
将executorservice替换为scheduledexecutor以延迟调度任务
实现可挂起接口，支持挂起/恢复功能。底层kafka客户机库已经支持挂起/恢复功能。

赞(0）分享  回复(0）举报  2021-06-05
uxhixvfz

uxhixvfz2#

camel版本3.0.0和camel-12765解决了这个问题
尝试升级到camel 3.x

赞(0）分享  回复(0）举报  2021-06-05
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