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Posted to issues@kylin.apache.org by "风语者 (JIRA)" <ji...@apache.org> on 2018/11/23 02:55:00 UTC
[jira] [Created] (KYLIN-3699) SparkCubingByLayer. Root cause: null
风语者 created KYLIN-3699:
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Summary: SparkCubingByLayer. Root cause: null
Key: KYLIN-3699
URL: https://issues.apache.org/jira/browse/KYLIN-3699
Project: Kylin
Issue Type: Bug
Components: Spark Engine
Affects Versions: v2.5.0
Environment: hdp.version： 2.5.0.0-1245
kylin: 2.5.0 （apache-kylin-2.5.0-bin-hbase1x）
Reporter: 风语者
你好：
我最近在使用 Kylin, 在使用 spark engine 构建 cube 的时候经常会出现一个异常，不知道怎么解决。异常如下：
Exception in thread "main" java.lang.RuntimeException: error execute org.apache.kylin.engine.spark.SparkCubingByLayer. Root cause: null
at org.apache.kylin.common.util.AbstractApplication.execute(AbstractApplication.java:42)
at org.apache.kylin.common.util.SparkEntry.main(SparkEntry.java:44)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at org.apache.spark.deploy.SparkSubmit$.org$apache$spark$deploy$SparkSubmit$$runMain(SparkSubmit.scala:744)
at org.apache.spark.deploy.SparkSubmit$.doRunMain$1(SparkSubmit.scala:187)
at org.apache.spark.deploy.SparkSubmit$.submit(SparkSubmit.scala:212)
at org.apache.spark.deploy.SparkSubmit$.main(SparkSubmit.scala:126)
at org.apache.spark.deploy.SparkSubmit.main(SparkSubmit.scala)
Caused by: java.lang.NullPointerException
at org.apache.kylin.engine.mr.common.CubeStatsReader.estimateLayerSize(CubeStatsReader.java:297)
at org.apache.kylin.engine.spark.SparkUtil.estimateLayerPartitionNum(SparkUtil.java:108)
at org.apache.kylin.engine.spark.SparkCubingByLayer.execute(SparkCubingByLayer.java:182)
at org.apache.kylin.common.util.AbstractApplication.execute(AbstractApplication.java:37)
我发现，出现这个异常的时候，fact table 与 lookup table 关联后记录条数为0，就会触发这个问题。会在 {color:#FF0000}*8 Step Name: Build Cube with Spark*{color} 报错。spark 引擎用的 kylin 自带的 spark 2.1.2. 集群环境：hdp.version： 2.5.0.0-1245
如果用 mapreduce 引擎构建的话，是可以正常构建的，没有数据，流程也可以正常走通。
不知道这个问题该怎么解决。
希望可以得到回复。
谢谢谢谢。
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