apache-kafka - 连接器配置不包含连接器类型

Question

我正在尝试使用 JDBC Connector连接到我集群上的 PostgreSQL 数据库(该数据库不直接由集群管理)。

我一直在使用以下命令调用 Kafka Connect:

connect-standalone.sh worker.properties jdbc-connector.properties

这是worker.properties文件的内容:

class=io.confluent.connect.jdbc.JdbcSourceConnector
name=test-postgres-1
tasks.max=1

internal.key.converter=org.apache.kafka.connect.json.JsonConverter
internal.value.converter=org.apache.kafka.connect.json.JsonConverter
internal.key.converter.schemas.enable=false
internal.value.converter.schemas.enable=false

offset.storage.file.filename=/home/user/offest
value.converter=org.apache.kafka.connect.json.JsonConverter
key.converter=org.apache.kafka.connect.json.JsonConverter

connection.url=jdbc:postgresql://database-server.url:port/database?user=user&password=password

这是 jdbc-connector.properties 的内容:

mode=incrementing
incrementing.column.name=id
topic.prefix=test-postgres-jdbc-

当我尝试使用上述命令启动连接器时，它崩溃并出现以下错误:

[2018-04-16 11:39:08,164] ERROR Failed to create job for jdbc.properties (org.apache.kafka.connect.cli.ConnectStandalone:88)
[2018-04-16 11:39:08,166] ERROR Stopping after connector error (org.apache.kafka.connect.cli.ConnectStandalone:99)
java.util.concurrent.ExecutionException: org.apache.kafka.connect.runtime.rest.errors.BadRequestException: Connector config {mode=incrementing, incrementing.column.name=pdv, topic.prefix=test-postgres-jdbc-} contains no connector type
    at org.apache.kafka.connect.util.ConvertingFutureCallback.result(ConvertingFutureCallback.java:80)
    at org.apache.kafka.connect.util.ConvertingFutureCallback.get(ConvertingFutureCallback.java:67)
    at org.apache.kafka.connect.cli.ConnectStandalone.main(ConnectStandalone.java:96)
Caused by: org.apache.kafka.connect.runtime.rest.errors.BadRequestException: Connector config {mode=incrementing, incrementing.column.name=id, topic.prefix=test-postgres-jdbc-} contains no connector type
    at org.apache.kafka.connect.runtime.AbstractHerder.validateConnectorConfig(AbstractHerder.java:233)
    at org.apache.kafka.connect.runtime.standalone.StandaloneHerder.putConnectorConfig(StandaloneHerder.java:158)
    at org.apache.kafka.connect.cli.ConnectStandalone.main(ConnectStandalone.java:93)

在注意到导致错误的连接器仅显示来自 jdbc-connector.properties 的信息后，我尝试将这两个文件合并在一起，但是命令突然终止(没有创建主题或偏移文件)具有以下输出:

[SLF4J infos...]
[2018-04-16 11:48:54,620] INFO Usage: ConnectStandalone worker.properties connector1.properties [connector2.properties ...] (org.apache.kafka.connect.cli.ConnectStandalone:59)

Answer 1

您需要在 jdbc-connector.properties 中拥有大部分这些属性，而不是在 worker.properties 中。参见 https://docs.confluent.io/current/connect/connect-jdbc/docs/source_config_options.html有关连接器配置中配置选项的完整列表(jdbc-connector.properties 在您的示例中)。

试试这个:

• worker.properties:

  internal.key.converter=org.apache.kafka.connect.json.JsonConverter
  internal.value.converter=org.apache.kafka.connect.json.JsonConverter
  internal.key.converter.schemas.enable=false
  internal.value.converter.schemas.enable=false
  
  offset.storage.file.filename=/home/user/offest
  value.converter=org.apache.kafka.connect.json.JsonConverter
  key.converter=org.apache.kafka.connect.json.JsonConverter
  

• jdbc-connector.properties:

  class=io.confluent.connect.jdbc.JdbcSourceConnector
  name=test-postgres-1
  tasks.max=1
  
  mode=incrementing
  incrementing.column.name=id
  topic.prefix=test-postgres-jdbc-
  
  connection.url=jdbc:postgresql://database-server.url:port/database?user=user&password=password
  

您可以在此处查看更多有关 Kafka Connect 的示例:

• https://www.confluent.io/blog/simplest-useful-kafka-connect-data-pipeline-world-thereabouts-part-1/
• https://www.confluent.io/blog/blogthe-simplest-useful-kafka-connect-data-pipeline-in-the-world-or-thereabouts-part-2/
• https://www.confluent.io/blog/simplest-useful-kafka-connect-data-pipeline-world-thereabouts-part-3/