Hi, We have upgraded an application originally written for Flink 1.9.1 with Scala 2.11 to Flink 1.11.2 with Scala 2.12.7 and we are seeing the following error at runtime.
2021-03-16 20:37:08 java.lang.RuntimeException at org.apache.flink.streaming.runtime.io.RecordWriterOutput.pushToRecordWriter(RecordWriterOutput.java:110) at org.apache.flink.streaming.runtime.io.RecordWriterOutput.collect(RecordWriterOutput.java:89) at org.apache.flink.streaming.runtime.io.RecordWriterOutput.collect(RecordWriterOutput.java:45) at org.apache.flink.streaming.api.operators.CountingOutput.collect(CountingOutput.java:52) at org.apache.flink.streaming.api.operators.CountingOutput.collect(CountingOutput.java:30) at org.apache.flink.streaming.api.operators.StreamSourceContexts$ManualWatermarkContext.processAndCollectWithTimestamp(StreamSourceContexts.java:310) at org.apache.flink.streaming.api.operators.StreamSourceContexts$WatermarkContext.collectWithTimestamp(StreamSourceContexts.java:409) at org.apache.flink.streaming.connectors.kafka.internals.AbstractFetcher.emitRecordsWithTimestamps(AbstractFetcher.java:352) at org.apache.flink.streaming.connectors.kafka.internal.KafkaFetcher.partitionConsumerRecordsHandler(KafkaFetcher.java:185) at org.apache.flink.streaming.connectors.kafka.internal.KafkaFetcher.runFetchLoop(KafkaFetcher.java:141) at org.apache.flink.streaming.connectors.kafka.FlinkKafkaConsumerBase.run(FlinkKafkaConsumerBase.java:755) at org.apache.flink.streaming.api.operators.StreamSource.run(StreamSource.java:100) at org.apache.flink.streaming.api.operators.StreamSource.run(StreamSource.java:63) at org.apache.flink.streaming.runtime.tasks.SourceStreamTask$LegacySourceFunctionThread.run(SourceStreamTask.java:213) Caused by: java.lang.ClassCastException The class in question was using Scala Long and Scala BigDecimal types which have been changed to Java Long and Java BigDecimal types as a means to resolve this error but to no avail. This application is running on AWS EMR running emr-6.2.0 if that helps. Thanks, Sourabh -- Sent from: http://apache-flink-user-mailing-list-archive.2336050.n4.nabble.com/