java.lang.RuntimeException

readObject can't find class

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Stack trace

  • java.lang.RuntimeException: readObject can't find class at org.apache.hadoop.mapreduce.lib.input.TaggedInputSplit.readClass(TaggedInputSplit.java:136) 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$2.run(YarnChild.java:168) at java.security.AccessController.doPrivileged(Native Method) at javax.security.auth.Subject.doAs(Subject.java:415) at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1548) at org.apache.hadoop.mapred.YarnChild.main(YarnChild.java:163) Caused by: java.lang.ClassNotFoundException: Class io.druid.indexer.DetermineHashedPartitionsJob$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) ... 11 more

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