解决kylin报错：Failed to create dictionary on <db>.<table>, Caused by: java.lang.IllegalArgumentException: Too high cardinality is not suitable for dictionary
报错信息：
2017-05-13 15:14:30,035 DEBUG [pool-9-thread-10] dict.DictionaryGenerator:94 : Dictionary class: org.apache.kylin.dict.TrieDictionary
2017-05-13 15:14:30,036 ERROR [pool-9-thread-10] common.HadoopShellExecutable:65 : error execute HadoopShellExecutable{id=2657ff38-35b0-4a33-9f6b-fee48031147f-03, name=B
uild Dimension Dictionary, state=RUNNING}
java.lang.RuntimeException: Failed to create dictionary on HM_30_1_PROD_20170418_20170512.OUTPATIENT_VISIT_ANTIBIOTICS.VISIT_SN
at org.apache.kylin.dict.DictionaryManager.buildDictionary(DictionaryManager.java:325)
at org.apache.kylin.cube.CubeManager.buildDictionary(CubeManager.java:222)
at org.apache.kylin.cube.cli.DictionaryGeneratorCLI.processSegment(DictionaryGeneratorCLI.java:50)
at org.apache.kylin.cube.cli.DictionaryGeneratorCLI.processSegment(DictionaryGeneratorCLI.java:41)
at org.apache.kylin.engine.mr.steps.CreateDictionaryJob.run(CreateDictionaryJob.java:54)
at org.apache.hadoop.util.ToolRunner.run(ToolRunner.java:70)
at org.apache.hadoop.util.ToolRunner.run(ToolRunner.java:84)
at org.apache.kylin.engine.mr.common.HadoopShellExecutable.doWork(HadoopShellExecutable.java:63)
at org.apache.kylin.job.execution.AbstractExecutable.execute(AbstractExecutable.java:113)
at org.apache.kylin.job.execution.DefaultChainedExecutable.doWork(DefaultChainedExecutable.java:57)
at org.apache.kylin.job.execution.AbstractExecutable.execute(AbstractExecutable.java:113)
at org.apache.kylin.job.impl.threadpool.DefaultScheduler$JobRunner.run(DefaultScheduler.java:136)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
at java.lang.Thread.run(Thread.java:745)
Caused by: java.lang.IllegalArgumentException: Too high cardinality is not suitable for dictionary -- cardinality: 5980217
at org.apache.kylin.dict.DictionaryGenerator.buildDictionary(DictionaryGenerator.java:96)
at org.apache.kylin.dict.DictionaryGenerator.buildDictionary(DictionaryGenerator.java:73)
at org.apache.kylin.dict.DictionaryManager.buildDictionary(DictionaryManager.java:321)
... 14 more
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