Error message:

2017-06-26 14:17:30,167 INFO  [pool-9-thread-3] cli.DictionaryGeneratorCLI:57 : Building snapshot of ENERGON_DM.DM_DIAGNOSIS_FACT_SGYY_ROOT_SET_FLAG
2017-06-26 14:17:31,484 ERROR [pool-9-thread-3] common.HadoopShellExecutable:65 : error execute HadoopShellExecutable{id=8188ef71-3bc6-4b9a-b87d-5559e3ea6b4a-03, name=Bu
ild Dimension Dictionary, state=RUNNING}
java.lang.ArrayIndexOutOfBoundsException: -1
        at org.apache.kylin.dict.lookup.SnapshotTable.takeSnapshot(SnapshotTable.java:89)
        at org.apache.kylin.dict.lookup.SnapshotManager.buildSnapshot(SnapshotManager.java:132)
        at org.apache.kylin.cube.CubeManager.buildSnapshotTable(CubeManager.java:270)
        at org.apache.kylin.cube.cli.DictionaryGeneratorCLI.processSegment(DictionaryGeneratorCLI.java:58)
        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)

solve:

There are two tables with the same name but different case under/table/in the meta. The ID of the column in the meta file starts with 0 and should be 1 under normal conditions. Kylin internally saves the table meta into a HashMap, and the key is the upper case table name, whether it is upper case or not. In this case, the content of the small and medium-sized meta overwrites the uppercase meta content. When checking the ID, one operation is to set the ID value to – 1. If the original ID is 0, – 1 becomes – 1, and then the above exception is thrown.

org.apache.kylin.dict.lookup.SnapshotTable:

org.apache.kylin.metadata.model.ColumnDesc:

Question meta:

PS: class org.apache.kylin.metadata.model.columndesc corresponds to a column in the table:

v.s.