无法通过 Env 变量设置带有 camelCase 名称的主题

Question

我正在使用 helm 部署 zeebe。使用 extraInitContainers 指令，我设法包含 kafka-exporter 3.1.1 并正确加载。在yml文件中我设置了一系列env变量，下面你可以看到一个摘录：

env:
    - name: ZEEBE_BROKER_EXPORTERS_KAFKA_ARGS_PRODUCER_SERVERS
      value: acme-infrastructure-kafka:9092
    - name: ZEEBE_BROKER_EXPORTERS_KAFKA_ARGS_PRODUCER_CONFIG
      value: "linger.ms=5\nbuffer.memory=8388608\nbatch.size=32768\nmax.block.ms=5000"
    - name: ZEEBE_BROKER_EXPORTERS_KAFKA_CLASSNAME
      value: io.zeebe.exporters.kafka.KafkaExporter
    - name: ZEEBE_BROKER_EXPORTERS_KAFKA_JARPATH
      value: /usr/local/zeebe/exporters/zeebe-kafka-exporter.jar
    - name: ZEEBE_BROKER_EXPORTERS_KAFKA_ARGS_RECORDS_DEFAULTS_TYPE
      value: ""
    - name: ZEEBE_BROKER_EXPORTERS_KAFKA_ARGS_RECORDS_DEFAULTS_TOPIC
      value: "zeebe"
    - name: ZEEBE_BROKER_EXPORTERS_KAFKA_ARGS_RECORDS_JOB_TYPE
      value: "event"
    - name: ZEEBE_BROKER_EXPORTERS_KAFKA_ARGS_RECORDS_JOB_TOPIC
      value: "zeebe-job"
    - name: ZEEBE_BROKER_EXPORTERS_KAFKA_ARGS_RECORDS_PROCESSINSTANCE_TYPE
      value: "event"
    - name: ZEEBE_BROKER_EXPORTERS_KAFKA_ARGS_RECORDS_PROCESSINSTANCE_TOPIC
      value: "zeebe-process-instance"

使用此配置，我没有收到任何 zeebe 主题记录，但收到了类型为 EVENT 的 zeebe-job 和 zeebe-process-instance 的主题，如文档所述。但我只得到工作，我认为流程实例主题不起作用，因为它想要这个： json 配置文件中的 processInstance 但它得到这个 处理实例。从zeebe logs，开机可以看到配置，主题全部小写：

io.camunda.zeebe.broker.exporter - Configured Kafka exporter: Config{producer=ProducerConfig{clientId='zeebe', closeTimeout=PT20S, config={batch.size=32768, max.block.ms=5000, buffer.memory=8388608, linger.ms=5}, requestTimeout=PT5S, maxBlockingTimeout=PT2S, servers=[datamanent-infrastructure-kafka:9092]}, records=RecordsConfig{typeMap={JOB=RecordConfig{allowedTypes=[EVENT], topic='zeebe-job'}, INCIDENT=RecordConfig{allowedTypes=[EVENT], topic='zeebe-incident'}, ERROR=RecordConfig{allowedTypes=[EVENT], topic='zeebe-error'}, PROCESS=RecordConfig{allowedTypes=[EVENT], topic='zeebe-process'}}, defaults=RecordConfig{allowedTypes=[], topic='zeebe'}}, maxBatchSize=100, commitInterval=PT1S}
2022-03-21 14:16:29.038 [] [main] INFO
      io.camunda.zeebe.broker.system - Version: 1.3.4
2022-03-21 14:16:29.068 [] [main] INFO
      io.camunda.zeebe.broker.system - Starting broker 0 with configuration {

 "kafka" : {
      "jarPath" : "/usr/local/zeebe/exporters/zeebe-kafka-exporter.jar",
      "className" : "io.zeebe.exporters.kafka.KafkaExporter",
      "args" : {
        "maxbatchsize" : "100",
        "producer" : {
          "clientid" : "zeebe",
          "servers" : "acme-infrastructure-kafka:9092",
          "config" : "linger.ms=5\nbuffer.memory=8388608\nbatch.size=32768\nmax.block.ms=5000"
        },
        "records" : {
          "job" : {
            "topic" : "zeebe-job",
            "type" : "event"
          },
          "process" : {
            "type" : "event",
            "topic" : "zeebe-process"
          },
          "defaults" : {
            "type" : "",
            "topic" : "zeebe"
          },
          "error" : {
            "topic" : "zeebe-error",
            "type" : "event"
          },
          "incident" : {
            "type" : "event",
            "topic" : "zeebe-incident"
          },
          "processinstance" : {
            "topic" : "zeebe-process-instance",
            "type" : "event"
          }
        },
        "maxblockingtimeoutms" : "1000",
        "flushintervalms" : "1000"
      },
      "external" : true
    }

这里是社区项目的link： https://github.com/camunda-community-hub/zeebe-kafka-exporter

Answer 1

这是一个已知限制https://github.com/camunda/zeebe/issues/4724 we hope we can fix this with use of Spring's ApplicationContext to instantiate exporter arguments see https://github.com/camunda/zeebe/issues/7628

作为正确配置的解决方法，可以使用 JAVA_OPTIONS 环境变量：

所以例如写 ZEEBE_BROKER_EXPORTERS_KAFKA_ARGS_RECORDS_PROCESSINSTANCE_TYPE=event 为 JAVA_OPTS="${JAVA_OPTS} -Dzeebe.broker.exporters.kafka.args.records.processInstance.type=event

或者您可以通过 application.yaml https://github.com/camunda/zeebe/blob/main/dist/src/main/config/broker.standalone.yaml.template 来实现，您可以将其从 configmap 挂载到容器中。

无法通过 Env 变量设置带有 camelCase 名称的主题

Unable to set topic with camelCase name via Env variable

apache-kafka

camunda

zeebe