Kafka Mysql Connector plugin.path 配置

Question

我正在尝试将mysql 与kafka 连接起来。我已经下载了debezium-debezium-connector-mysql

这是我的connect-standalone.properties：

# These are defaults. This file just demonstrates how to override some settings.
bootstrap.servers=localhost:9092

# The converters specify the format of data in Kafka and how to translate it into Connect data. Every Connect user will
# need to configure these based on the format they want their data in when loaded from or stored into Kafka
key.converter=org.apache.kafka.connect.json.JsonConverter
value.converter=org.apache.kafka.connect.json.JsonConverter
# Converter-specific settings can be passed in by prefixing the Converter's setting with the converter we want to apply
# it to
key.converter.schemas.enable=true
value.converter.schemas.enable=true

offset.storage.file.filename=/tmp/connect.offsets
# Flush much faster than normal, which is useful for testing/debugging
offset.flush.interval.ms=10000

# Set to a list of filesystem paths separated by commas (,) to enable class loading isolation for plugins
# (connectors, converters, transformations). The list should consist of top level directories that include 
# any combination of: 
# a) directories immediately containing jars with plugins and their dependencies
# b) uber-jars with plugins and their dependencies
# c) directories immediately containing the package directory structure of classes of plugins and their dependencies
# Note: symlinks will be followed to discover dependencies or plugins.
# Examples: 
# plugin.path=/usr/local/share/java,/usr/local/share/kafka/plugins,/opt/connectors,
plugin.path=/home/ec2-user/share/confluent-hub-components/debezium-debezium-connector-mysql/lib

我的test.config：

{
  "name": "mysql-source-demo-customers",
  "config": {
      "connector.class": "io.debezium.connector.mysql.MySqlConnector",
      "database.hostname": "localhost",
      "database.port": "3306",
      "database.user": "root",
      "database.password": "dsm1234",
      "database.server.id": "42",
      "database.server.name": "asgard",
      "table.whitelist": "demo.customers",
      "database.history.kafka.bootstrap.servers": "localhost:9092",
      "database.history.kafka.topic": "dbhistory.demo" ,
      "include.schema.changes": "true",
      "transforms": "unwrap,InsertTopic,InsertSourceDetails",
      "transforms.unwrap.type": "io.debezium.transforms.UnwrapFromEnvelope",
      "transforms.InsertTopic.type":"org.apache.kafka.connect.transforms.InsertField$Value",
      "transforms.InsertTopic.topic.field":"messagetopic",
      "transforms.InsertSourceDetails.type":"org.apache.kafka.connect.transforms.InsertField$Value",
      "transforms.InsertSourceDetails.static.field":"messagesource",
      "transforms.InsertSourceDetails.static.value":"Debezium CDC from MySQL on asgard"
  }
}

当我运行bin/connect-standalone.sh config/connect-standalone.properties test.config时，

我得到一个错误：

[2019-11-19 09:10:45,146] 信息扫描插件类。这可能需要一点时间......（org.apache.kafka.connect.cli.ConnectStandalone:78） [2019-11-19 09:10:45,170] 信息从以下位置加载插件：/home/ec2-user/share/confluent-hub-components/debezium-debezium-connector-mysql/lib/mysql-binlog-connector-java- 0.19.1.jar (org.apache.kafka.connect.runtime.isolation.DelegatingClassLoader:222) [2019-11-19 09:10:45,291] INFO 注册加载程序：PluginClassLoader{pluginLocation=file:/home/ec2-user/share/confluent-hub-components/debezium-debezium-connector-mysql/lib/mysql-binlog -connector-java-0.19.1.jar} (org.apache.kafka.connect.runtime.isolation.DelegatingClassLoader:245) [2019-11-19 09:10:45,292] INFO 添加了插件“org.apache.kafka.connect.connector.policy.AllConnectorClientConfigOverridePolicy”（org.apache.kafka.connect.runtime.isolation.DelegatingClassLoader:174） [2019-11-19 09:10:45,292] 信息添加了插件“org.apache.kafka.connect.connector.policy.PrincipalConnectorClientConfigOverridePolicy”（org.apache.kafka.connect.runtime.isolation.DelegatingClassLoader:174） [2019-11-19 09:10:45,292] INFO 添加了插件“org.apache.kafka.connect.connector.policy.NoneConnectorClientConfigOverridePolicy”（org.apache.kafka.connect.runtime.isolation.DelegatingClassLoader:174） [2019-11-19 09:10:45,293] 信息从以下位置加载插件：/home/ec2-user/share/confluent-hub-components/debezium-debezium-connector-mysql/lib/debezium-connector-mysql-0.10。 0.Final.jar (org.apache.kafka.connect.runtime.isolation.DelegatingClassLoader:222) [2019-11-19 09:10:45,324] ERROR 由于错误而停止（org.apache.kafka.connect.cli.ConnectStandalone:130） java.lang.NoClassDefFoundError: io/debezium/util/IoUtil 在 io.debezium.connector.mysql.Module.(Module.java:19) 在 io.debezium.connector.mysql.MySqlConnector.version（MySqlConnector.java:47） 在 org.apache.kafka.connect.runtime.isolation.DelegatingClassLoader.versionFor(DelegatingClassLoader.java:350) 在 org.apache.kafka.connect.runtime.isolation.DelegatingClassLoader.versionFor(DelegatingClassLoader.java:355) 在 org.apache.kafka.connect.runtime.isolation.DelegatingClassLoader.getPluginDesc(DelegatingClassLoader.java:331) 在 org.apache.kafka.connect.runtime.isolation.DelegatingClassLoader.scanPluginPath(DelegatingClassLoader.java:311) 在 org.apache.kafka.connect.runtime.isolation.DelegatingClassLoader.scanUrlsAndAddPlugins(DelegatingClassLoader.java:244) 在 org.apache.kafka.connect.runtime.isolation.DelegatingClassLoader.registerPlugin(DelegatingClassLoader.java:236) 在 org.apache.kafka.connect.runtime.isolation.DelegatingClassLoader.initPluginLoader(DelegatingClassLoader.java:205) 在 org.apache.kafka.connect.runtime.isolation.DelegatingClassLoader.initLoaders(DelegatingClassLoader.java:182) 在 org.apache.kafka.connect.runtime.isolation.Plugins.(Plugins.java:61) 在 org.apache.kafka.connect.cli.ConnectStandalone.main(ConnectStandalone.java:79) 引起：java.lang.ClassNotFoundException：io.debezium.util.IoUtil 在 java.net.URLClassLoader.findClass(URLClassLoader.java:382) 在 java.lang.ClassLoader.loadClass(ClassLoader.java:418) 在 org.apache.kafka.connect.runtime.isolation.PluginClassLoader.loadClass(PluginClassLoader.java:104) 在 java.lang.ClassLoader.loadClass(ClassLoader.java:351) ... 12 更多

通过查看日志，io/debezium/util/IoUtil 似乎是个问题。
（我用谷歌搜索并在 stackoverflow 上搜索了插件路径。我在 Stackoverflow 中发现了一个类似的问题并按照它进行操作，但仍然无法正常工作。）

我错过了什么？

Answer 1

如果您使用 Confluent Hub 客户端安装连接器，则无需编辑插件路径。它是递归扫描的，所以 /home/ec2-user/share/confluent-hub-components 应该可以工作。

旁注：我建议将插件存储在 ec2-user 主文件夹以外的位置，因为这样长时间运行的进程通常以它们自己的受限用户帐户运行