【Azure 事件中心】开启 Apache Flink 制造者 Producer 示例代码中的日志输出 （连接 Azure Event Hub Kafka 终结点）

问题描述

Azure Event Hub 在标准版以上就默认启用的Kafka终结点，所以可以通过Apache Kafka协议连接到Event Hub进行消息的生产和消费。通过示例代码下载到本地运行后，发现没有 Kafka Producer 的详细日志输出。当查看SDK源码中，发现使用的是 org.slf4j.Logger 输出日志，如：

但是，当运行 Producer 代码后，得到的输出取没有包含连接的详细信息，对出现连接问题的Debug没有任何帮助。

SLF4J: Failed to load class "org.slf4j.impl.StaticLoggerBinder".
SLF4J: Defaulting to no-operation (NOP) logger implementation
SLF4J: See http://www.slf4j.org/codes.html#StaticLoggerBinder for further details.
Test Data #0 from thread #18
org.apache.kafka.common.errors.IllegalSaslStateException: Invalid SASL mechanism response, server may be expecting a different protocol

那么如何来输出更加详细的日志呢？ 

问题解决

根据日志显示， SLF4J: Failed to load class "org.slf4j.impl.StaticLoggerBinder". 明确指出是因为没有加载到 org.slf4j.impl.StaticLoggerBinder 类，因为在程序执行的过程中，必须提供实际的日志记录实现，否则SLF4J讲忽略所有日志信息，SLF4J API 通过 SLF4J 绑定与实际的日志记录实现进行通信Log4j。所以需要在pom.xml中引入 org.slf4j 的相关依赖。

在pom.xml中加入

    <dependency>
      <groupId>org.slf4j</groupId>
      <artifactId>slf4j-api</artifactId>
      <version>1.7.25</version>
  </dependency>
  <dependency>
      <groupId>org.slf4j</groupId>
      <artifactId>slf4j-log4j12</artifactId>
      <version>1.7.25</version>
  </dependency>
  <dependency>
      <groupId>log4j</groupId>
      <artifactId>log4j</artifactId>
      <version>1.2.17</version>
  </dependency>
  <dependency>
    <groupId>ch.qos.logback</groupId>
    <artifactId>logback-classic</artifactId>
    <version>1.0.13</version>

然后，添加上log4j的配置文件，在resources文件夹下添加名为 log4j.properties文件，内容为：

# Root logger option
log4j.rootLogger=INFO, stdout
# Direct log messages to stdout
log4j.appender.stdout=org.apache.log4j.ConsoleAppender
log4j.appender.stdout.Target=System.out
log4j.appender.stdout.layout=org.apache.log4j.PatternLayout
log4j.appender.stdout.layout.ConversionPattern=%d{yyyy-MM-dd HH:mm:ss} %-5p %c{1} - %m%n

修改后的文件内容如截图所示：

修改完成，运行得到完整日志

SLF4J: Class path contains multiple SLF4J bindings.
SLF4J: Found binding in [jar:file:/C:/Users/.m2/repository/org/slf4j/slf4j-log4j12/1.7.25/slf4j-log4j12-1.7.25.jar!/org/slf4j/impl/StaticLoggerBinder.class]
SLF4J: Found binding in [jar:file:/C:/Users/.m2/repository/ch/qos/logback/logback-classic/1.0.13/logback-classic-1.0.13.jar!/org/slf4j/impl/StaticLoggerBinder.class]
SLF4J: See http://www.slf4j.org/codes.html#multiple_bindings for an explanation.
SLF4J: Actual binding is of type [org.slf4j.impl.Log4jLoggerFactory]
2022-01-11 20:03:12 INFO  ProducerConfig - ProducerConfig values: 
        acks = 1
        batch.size = 16384
        bootstrap.servers = [testeventxxxxxx.servicebus.chinacloudapi.cn:9093]
        buffer.memory = 33554432
        client.id = KafkaExampleProducer
        compression.type = none
        connections.max.idle.ms = 540000
        enable.idempotence = false
        interceptor.classes = null
        key.serializer = class org.apache.kafka.common.serialization.LongSerializer
        linger.ms = 0
        max.block.ms = 60000
        max.in.flight.requests.per.connection = 5
        max.request.size = 1048576
        metadata.max.age.ms = 300000
        metric.reporters = []
        metrics.num.samples = 2
        metrics.recording.level = INFO
        metrics.sample.window.ms = 30000
        security.protocol = SASL_SSL
        send.buffer.bytes = 131072
        ssl.cipher.suites = null
        ssl.enabled.protocols = [TLSv1.2, TLSv1.1, TLSv1]
        ssl.endpoint.identification.algorithm = null
        ssl.key.password = null
        ssl.keymanager.algorithm = SunX509
        ssl.keystore.location = null
        ssl.keystore.password = null
        ssl.keystore.type = JKS
        ssl.protocol = TLS
        ssl.provider = null
        ssl.secure.random.implementation = null
        ssl.trustmanager.algorithm = PKIX
        ssl.truststore.location = null
        ssl.truststore.password = null
        ssl.truststore.type = JKS
        transaction.timeout.ms = 60000
        transactional.id = null
        value.serializer = class org.apache.kafka.common.serialization.StringSerializer

2022-01-11 20:03:16 INFO  AbstractLogin - Successfully logged in.
2022-01-11 20:03:17 INFO  AppInfoParser - Kafka version : 1.0.0
2022-01-11 20:03:17 INFO  AppInfoParser - Kafka commitId : aaa7af6d4a11b29d
2022-01-11 20:03:21 INFO  TestProducer - test java logs  : info
2022-01-11 20:03:21 ERROR TestProducer - test java logs  : error
2022-01-11 20:03:21 WARN  TestProducer - test java logs  : warn
Test Data #0 from thread #18
2022-01-11 20:03:22 ERROR NetworkClient - [Producer clientId=KafkaExampleProducer] Connection to node -1 failed authentication due to: Invalid SASL mechanism response, server may be expecting a different protocol
org.apache.kafka.common.errors.IllegalSaslStateException: Invalid SASL mechanism response, server may be expecting a different protocol
org.apache.kafka.clients.producer.KafkaProducer@47dec663

参考资料

Slf4j Configuration File Example：https://examples.javacodegeeks.com/enterprise-java/slf4j/slf4j-configuration-file-example/

将 Apache Flink 与适用于 Apache Kafka 的 Azure 事件中心配合使用: https://docs.azure.cn/zh-cn/event-hubs/event-hubs-kafka-flink-tutorial

在微软云中国区 (Mooncake) 上实验以Apache Kafka协议方式发送/接受Event Hubs消息 (Java版) : https://www.cnblogs.com/lulight/p/14375190.html