GJL edited a comment on issue #9271: [FLINK-13384][1.9][runtime] Fix back 
pressure sampling for SourceStreamTask
URL: https://github.com/apache/flink/pull/9271#issuecomment-517003718
 
 
   Kafka 0.10 E2E test fails due to:
   
   ```
   java.lang.Exception: org.apache.kafka.common.config.ConfigException: Invalid 
value org.apache.kafka.common.serialization.ByteArrayDeserializer for conf
   iguration value.deserializer: Class 
org.apache.kafka.common.serialization.ByteArrayDeserializer could not be found.
           at 
org.apache.flink.streaming.runtime.tasks.SourceStreamTask$LegacySourceFunctionThread.checkThrowSourceExecutionException(SourceStreamTask.jav
   a:212)
           at 
org.apache.flink.streaming.runtime.tasks.SourceStreamTask.performDefaultAction(SourceStreamTask.java:132)
           at 
org.apache.flink.streaming.runtime.tasks.StreamTask.run(StreamTask.java:298)
           at 
org.apache.flink.streaming.runtime.tasks.StreamTask.invoke(StreamTask.java:403)
           at org.apache.flink.runtime.taskmanager.Task.doRun(Task.java:700)
           at org.apache.flink.runtime.taskmanager.Task.run(Task.java:530)
           at java.lang.Thread.run(Thread.java:748)
   Caused by: org.apache.kafka.common.config.ConfigException: Invalid value 
org.apache.kafka.common.serialization.ByteArrayDeserializer for configuration
   value.deserializer: Class 
org.apache.kafka.common.serialization.ByteArrayDeserializer could not be found.
           at 
org.apache.kafka.common.config.ConfigDef.parseType(ConfigDef.java:690)
           at org.apache.kafka.common.config.ConfigDef.parse(ConfigDef.java:433)
           at 
org.apache.kafka.common.config.AbstractConfig.<init>(AbstractConfig.java:56)
           at 
org.apache.kafka.common.config.AbstractConfig.<init>(AbstractConfig.java:63)
           at 
org.apache.kafka.clients.consumer.ConsumerConfig.<init>(ConsumerConfig.java:426)
           at 
org.apache.kafka.clients.consumer.KafkaConsumer.<init>(KafkaConsumer.java:597)
           at 
org.apache.kafka.clients.consumer.KafkaConsumer.<init>(KafkaConsumer.java:579)
           at 
org.apache.flink.streaming.connectors.kafka.internal.KafkaConsumerThread.getConsumer(KafkaConsumerThread.java:502)
           at 
org.apache.flink.streaming.connectors.kafka.internal.KafkaConsumerThread.run(KafkaConsumerThread.java:181)
   ```
   This is because we do not set the user class loader as the executing 
thread's context class loader before instantiating the invokable.
   

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