Hoping someone with more expertise could help on this:
I have no idea what's causing this to happen, but here is the exception:
java.lang.RuntimeException: org.apache.hadoop.hive.ql.metadata.HiveException:
Hive Runtime Error while processing row (tag=0)
{"key":{},"value":{"_col0":["0","0","0","0"]},"alias":0} at
org.apache.hadoop.hive.ql.exec.ExecReducer.reduce(ExecReducer.java:268) at
org.apache.hadoop.mapred.ReduceTask.runOldReducer(ReduceTask.java:467) at
org.apache.hadoop.mapred.ReduceTask.run(ReduceTask.java:415) at
org.apache.hadoop.mapred.Child.main(Child.java:170) Caused by:
org.apache.hadoop.hive.ql.metadata.HiveException: Hive Runtime Error while
processing row (tag=0) {"key":{},"value":{"_col0":["0","0","0","0"]},"alias":0}
at org.apache.hadoop.hive.ql.exec.ExecReducer.reduce(ExecReducer.java:256) ...
3 more Caused by: org.apache.hadoop.hive.ql.metadata.HiveException:
GenericUDAFnGramEvaluator: mismatch in value for 'n', which usually is caused
by a non-constant expression. Found '0' and '1'. at
org.apache.hadoop.hive.ql.udf.generic.GenericUDAFnGrams$GenericUDAFnGramEvaluator.merge(GenericU
DAFnGram
s.java:239) at
org.apache.hadoop.hive.ql.udf.generic.GenericUDAFEvaluator.aggregate(GenericUDAFEvaluator.java:142)
at
org.apache.hadoop.hive.ql.exec.GroupByOperator.updateAggregations(GroupByOperator.java:592)
at
org.apache.hadoop.hive.ql.exec.GroupByOperator.processAggr(GroupByOperator.java:816)
at
org.apache.hadoop.hive.ql.exec.GroupByOperator.processOp(GroupByOperator.java:716)
at org.apache.hadoop.hive.ql.exec.Operator.process(Operator.java:470) at
org.apache.hadoop.hive.ql.exec.ExecReducer.reduce(ExecReducer.java:247)
What does 'mismatch in value for n' mean?
My query is super simple:
select ngrams(sentences(text), 1, 50) from messages
--
Matthew Rathbone
Foursquare | Software Engineer | Server Engineering Team
matt...@foursquare.com (mailto:matt...@foursquare.com) | @rathboma
(http://twitter.com/rathboma) | 4sq (http://foursquare.com/rathboma)
