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via GitHub by jon-wei
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readObject can't find class
java.lang.ClassNotFoundException: Class io.druid.indexer.DetermineHashedPartitionsJob$DetermineCardinalityMapper not found	at org.apache.hadoop.conf.Configuration.getClassByName(Configuration.java:1788)	at org.apache.hadoop.mapreduce.lib.input.TaggedInputSplit.readClass(TaggedInputSplit.java:134)	at org.apache.hadoop.mapreduce.lib.input.TaggedInputSplit.readFields(TaggedInputSplit.java:122)	at org.apache.hadoop.io.serializer.WritableSerialization$WritableDeserializer.deserialize(WritableSerialization.java:71)	at org.apache.hadoop.io.serializer.WritableSerialization$WritableDeserializer.deserialize(WritableSerialization.java:42)	at org.apache.hadoop.mapred.MapTask.getSplitDetails(MapTask.java:371)	at org.apache.hadoop.mapred.MapTask.runOldMapper(MapTask.java:403)	at org.apache.hadoop.mapred.MapTask.run(MapTask.java:342)	at org.apache.hadoop.mapred.YarnChild$2.run(YarnChild.java:168)	at java.security.AccessController.doPrivileged(Native Method)	at javax.security.auth.Subject.doAs(Subject.java:415)	at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1548)	at org.apache.hadoop.mapred.YarnChild.main(YarnChild.java:163)