除了一个胖jar之外，所有东西都会在停靠的flink集群中失败。

Question

我有一个容器化的flink集群，具有独立的JobManager和2个任务管理器。当我提交一个包含我需要的连接器和代码的胖jar时，一切都会正常运行，但是一个只有我的代码的jar将失败--尽管我已经将连接器jar添加到/opt/flink/lib，容器进程显示它们将被添加到类路径中。当我试图从IDE进行远程连接时，也会发生同样的失败；不用说，每次都要打包一个胖jar，这会带来糟糕的开发体验。

我需要做什么才能让flink理解我放置在/opt/flink/lib中的额外jars应该与所有新作业一起使用？

类加载程序异常：

org.apache.flink.streaming.runtime.tasks.StreamTaskException:无法加载用户类: org.apache.flink.streaming.connectors.kafka.FlinkKafkaConsumer

flink Dockerfile：

FROM flink:1.7.2

ADD http://central.maven.org/maven2/org/apache/flink/flink-connector-kafka_2.12/1.7.2/flink-connector-kafka_2.12-1.7.2.jar /opt/flink/lib/
ADD http://central.maven.org/maven2/org/apache/flink/flink-avro-confluent-registry/1.7.2/flink-avro-confluent-registry-1.7.2.jar /opt/flink/lib/
ADD http://central.maven.org/maven2/org/apache/flink/flink-connector-elasticsearch6_2.12/1.7.2/flink-connector-elasticsearch6_2.12-1.7.2.jar /opt/flink/lib/

作业经理集装箱：

root@2406b722dae1:/tmp# ps ax | more
  PID TTY      STAT   TIME COMMAND
    1 ?        Ssl    1:01 /docker-java-home/jre/bin/java -Xms1024m -Xmx1024m -Dlog4j.configuration=file:/opt/flink/conf/log4j-console.properties -Dlogback.configurationFil
e=file:/opt/flink/conf/logback-console.xml -classpath /opt/flink/lib/flink-avro-confluent-registry-1.7.2.jar:/opt/flink/lib/flink-connector-elasticsearch6_2.12-1.7.2.jar:/o
pt/flink/lib/flink-connector-kafka_2.12-1.7.2.jar:/opt/flink/lib/flink-python_2.12-1.7.2.jar:/opt/flink/lib/log4j-1.2.17.jar:/opt/flink/lib/slf4j-log4j12-1.7.15.jar:/opt/fl
ink/lib/flink-dist_2.12-1.7.2.jar::: org.apache.flink.runtime.entrypoint.StandaloneSessionClusterEntrypoint --configDir /opt/flink/conf --executionMode cluster

任务管理器容器：

root@bd1aa6e35b5a:/tmp# ps ax | more
  PID TTY      STAT   TIME COMMAND
    1 ?        Ssl    0:28 /docker-java-home/jre/bin/java -XX:+UseG1GC -Xms922M -Xmx922M -XX:MaxDirectMemorySize=8388607T -Dlog4j.configuration=file:/opt/flink/conf/log4j-c
onsole.properties -Dlogback.configurationFile=file:/opt/flink/conf/logback-console.xml -classpath /opt/flink/lib/flink-avro-confluent-registry-1.7.2.jar:/opt/flink/lib/flin
k-connector-elasticsearch6_2.12-1.7.2.jar:/opt/flink/lib/flink-connector-kafka_2.12-1.7.2.jar:/opt/flink/lib/flink-python_2.12-1.7.2.jar:/opt/flink/lib/log4j-1.2.17.jar:/op
t/flink/lib/slf4j-log4j12-1.7.15.jar:/opt/flink/lib/flink-dist_2.12-1.7.2.jar::: org.apache.flink.runtime.taskexecutor.TaskManagerRunner --configDir /opt/flink/conf

运行的JobManager和TaskManagers上的/opt/flink/lib：

root@bd1aa6e35b5a:/opt/flink/lib# ls -lh
total 84M
-rw------- 1 root  root  2.7M Feb 11 16:25 flink-avro-confluent-registry-1.7.2.jar
-rw------- 1 root  root   30K Feb 11 16:21 flink-connector-elasticsearch6_2.12-1.7.2.jar
-rw------- 1 root  root   67K Feb 11 16:24 flink-connector-kafka_2.12-1.7.2.jar
-rw-r--r-- 1 flink flink  81M Feb 11 14:50 flink-dist_2.12-1.7.2.jar
-rw-r--r-- 1 flink flink 139K Feb 11 14:49 flink-python_2.12-1.7.2.jar
-rw-rw-r-- 1 flink flink 479K Feb 11 14:32 log4j-1.2.17.jar
-rw-rw-r-- 1 flink flink 9.7K Feb 11 14:32 slf4j-log4j12-1.7.15.jar

万一有任何疑问--这门课就在预期的罐子里：

root@bd1aa6e35b5a:/opt/flink/lib# unzip -l flink-connector-kafka_2.12-1.7.2.jar | grep FlinkKafkaConsumer
    14272  2019-02-12 00:24   org/apache/flink/streaming/connectors/kafka/FlinkKafkaConsumer.class

Answer 1

我想明白了。我的第一个问题是flink在flink用户下运行，从清单中可以看出，我在Dockerfile中添加的文件属于root。之后我遇到的问题是，sbt程序集为您打包了所有传递的依赖项，您必须在Dockerfile中手动完成这些工作(胖jar文件大小与我添加的文件之间的差异应该会导致这种情况)。

我修正了所有权问题的Dockerfile和Kafka连接器的传递依赖关系(elasticsearch可能仍然有很多缺少的依赖项)：

FROM flink:1.7.2

ADD --chown=flink:flink http://central.maven.org/maven2/org/apache/flink/flink-connector-kafka_2.12/1.7.2/flink-connector-kafka_2.12-1.7.2.jar /opt/flink/lib/
ADD --chown=flink:flink http://central.maven.org/maven2/org/apache/flink/flink-connector-kafka-base_2.12/1.7.2/flink-connector-kafka-base_2.12-1.7.2.jar /opt/flink/lib/
ADD --chown=flink:flink http://central.maven.org/maven2/org/apache/flink/flink-avro/1.7.2/flink-avro-1.7.2.jar /opt/flink/lib/
ADD --chown=flink:flink http://central.maven.org/maven2/org/apache/flink/flink-json/1.7.2/flink-json-1.7.2.jar /opt/flink/lib/
ADD --chown=flink:flink http://central.maven.org/maven2/org/apache/avro/avro/1.8.2/avro-1.8.2.jar /opt/flink/lib/
ADD --chown=flink:flink http://central.maven.org/maven2/org/apache/kafka/kafka-clients/0.10.2.1/kafka-clients-0.10.2.1.jar /opt/flink/lib/
ADD --chown=flink:flink http://central.maven.org/maven2/net/jpountz/lz4/lz4/1.3.0/lz4-1.3.0.jar /opt/flink/lib/
ADD --chown=flink:flink http://central.maven.org/maven2/org/xerial/snappy/snappy-java/1.1.2.6/snappy-java-1.1.2.6.jar /opt/flink/lib/
ADD --chown=flink:flink http://central.maven.org/maven2/org/apache/flink/flink-avro-confluent-registry/1.7.2/flink-avro-confluent-registry-1.7.2.jar /opt/flink/lib/
ADD --chown=flink:flink http://central.maven.org/maven2/org/apache/flink/flink-connector-elasticsearch6_2.12/1.7.2/flink-connector-elasticsearch6_2.12-1.7.2.jar /opt/flink/lib/