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via GitHub by jon-wei
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readObject can't find class
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readObject can't find class
java.lang.ClassNotFoundException: Class io.druid.indexer.DetermineHashedPartitionsJob$DetermineCardinalityMapper not found	at org.apache.hadoop.conf.Configuration.getClassByName(	at org.apache.hadoop.mapreduce.lib.input.TaggedInputSplit.readClass(	at org.apache.hadoop.mapreduce.lib.input.TaggedInputSplit.readFields(	at$WritableDeserializer.deserialize(	at$WritableDeserializer.deserialize(	at org.apache.hadoop.mapred.MapTask.getSplitDetails(	at org.apache.hadoop.mapred.MapTask.runOldMapper(	at	at org.apache.hadoop.mapred.YarnChild$	at Method)	at	at	at org.apache.hadoop.mapred.YarnChild.main(