kylin#2 Step Error

[冯腾]

Error # 2 Step executed in kylin, as indicated in the log.Step by step, finally 
found in the hive perform “set mapreduce.job.reduces=1”.Error: 
Error while processing the statement: always modify graphs. The job, reduces 
the at runtime. It is not in the list of params that are allowed to be modified 
at runtime (state = 42000, code = 1)
 who encountered this problem.Help me out if you can