我正在尝试将我们的confluent-kafka-connect从3.2.0升级到5.3.0
Docker文件-
FROM confluentinc/cp-kafka-connect:5.3.0
COPY connector-drivers/Common/ /usr/share/java/confluent-common/
COPY connector-drivers/JDBC/ /usr/share/java/kafka-connect-jdbc/
ENV CLASSPATH=/usr/share/java/kafka-connect-jdbc/*:/usr/share/java/kafka-connect-jdbc/as400-java6-jt400.jar:/usr/share/java/kafka-connect-jdbc/jtds-1.3.1.jar:/usr/share/java/kafka-connect-jdbc/sqljdbc4-3.0.jar:/usr/share/java/confluent-common/kafka-connect-cassandra-1.0.0-1.0.0-all.jar:/usr/share/java/confluent-common/kafka-connect-couchbase-3.3.2.jar:/usr/share/java/kafka-connect-jdbc/ojdbc6.jar:/usr/share/java/kafka-connect-jdbc/mysql-connector-java-5.1.44-bin.jar
RUN echo "===> Installing Replicator ..." \
&& apt-get -qq update \
&& apt-get install -y \
confluent-kafka-connect-replicator=5.3.0-1 \
&& echo "===> Cleaning up ..." \
&& apt-get clean && rm -rf /tmp/* /var/lib/apt/lists/*
由于复制器无法在s3中找到相关文件，因此我在RUN命令下面添加了docker文件。
RUN sed -i s,https://s3-us-west-2.amazonaws.com/staging-confluent-packages-5.3.0/deb/5.3,https://packages.confluent.io/deb/5.3, /etc/apt/sources.list
当我尝试在DCOS群集中进行部署时，stdout文件中出现错误消息
[2019-08-28 23:01:19,289] ERROR Stopping due to error (org.apache.kafka.connect.cli.ConnectDistributed)
java.lang.IncompatibleClassChangeError: Implementing class
at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClass(ClassLoader.java:763)
at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142)
at java.net.URLClassLoader.defineClass(URLClassLoader.java:468)
at java.net.URLClassLoader.access$100(URLClassLoader.java:74)
at java.net.URLClassLoader$1.run(URLClassLoader.java:369)
at java.net.URLClassLoader$1.run(URLClassLoader.java:363)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:362)
at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:349)
at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClass(ClassLoader.java:763)
at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142)
at java.net.URLClassLoader.defineClass(URLClassLoader.java:468)
at java.net.URLClassLoader.access$100(URLClassLoader.java:74)
at java.net.URLClassLoader$1.run(URLClassLoader.java:369)
at java.net.URLClassLoader$1.run(URLClassLoader.java:363)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:362)
at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:349)
at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
at java.lang.Class.getDeclaredConstructors0(Native Method)
at java.lang.Class.privateGetDeclaredConstructors(Class.java:2671)
at java.lang.Class.getConstructor0(Class.java:3075)
at java.lang.Class.newInstance(Class.java:412)
at org.apache.kafka.connect.runtime.isolation.DelegatingClassLoader.versionFor(DelegatingClassLoader.java:355)
at org.apache.kafka.connect.runtime.isolation.DelegatingClassLoader.getPluginDesc(DelegatingClassLoader.java:331)
at org.apache.kafka.connect.runtime.isolation.DelegatingClassLoader.scanPluginPath(DelegatingClassLoader.java:311)
at org.apache.kafka.connect.runtime.isolation.DelegatingClassLoader.scanUrlsAndAddPlugins(DelegatingClassLoader.java:244)
at org.apache.kafka.connect.runtime.isolation.DelegatingClassLoader.initPluginLoader(DelegatingClassLoader.java:192)
at org.apache.kafka.connect.runtime.isolation.DelegatingClassLoader.initLoaders(DelegatingClassLoader.java:185)
at org.apache.kafka.connect.runtime.isolation.Plugins.<init>(Plugins.java:61)
at org.apache.kafka.connect.cli.ConnectDistributed.startConnect(ConnectDistributed.java:91)
at org.apache.kafka.connect.cli.ConnectDistributed.main(ConnectDistributed.java:78)
我注意到，此错误仅在定义了cassandra jar文件时发生，我也尝试过使用kafka-connect-cassandra-1.2.2-2.1.0-all.tar.gz jar，仍然是同样的问题。
注意-使用相同的cassandra jar，confluent-kafka-connect可以正常工作到3.3.0版本。