wrong key class: is not class

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  • wrong key class: is not class at$Writer.append( at org.apache.hadoop.mapreduce.lib.output.SequenceFileOutputFormat$1.write( at org.apache.hadoop.mapred.ReduceTask$NewTrackingRecordWriter.write( at org.apache.hadoop.mapreduce.task.TaskInputOutputContextImpl.write( at org.apache.hadoop.mapreduce.lib.reduce.WrappedReducer$Context.write( at org.apache.hadoop.mapreduce.Reducer.reduce( at at org.apache.hadoop.mapred.ReduceTask.runNewReducer( at at org.apache.hadoop.mapred.YarnChild$ at Method) at at at org.apache.hadoop.mapred.YarnChild.main(

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