[KYLIN-5067] CubeBuildJob build unnecessary snapshot

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: v4.0.0-beta
• Fix Version/s: v4.0.1
• Skill Level: Committer(Medium) - This is for regular contributors/committers
• Assignee: Xiaoxiang Yu
• Reporter: Xiaoxiang Yu
• Created: 24/Aug/21 12:45
• Updated: 06/Jan/22 06:47
• Resolved: 09/Nov/21 09:17

Description

In TPC-H benchmark, the query-13, which contains a 'left outer join', and its right table's join key(o_custkey), is not unique. And it will cause the build job failed with following exception.

 

java.lang.RuntimeException: Error execute org.apache.kylin.engine.spark.job.CubeBuildJob
	at org.apache.kylin.engine.spark.application.SparkApplication.execute(SparkApplication.java:96)
	at org.apache.spark.application.JobWorker$$anon$2.run(JobWorker.scala:55)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
	at java.lang.Thread.run(Thread.java:748)
Caused by: java.lang.IllegalStateException: Failed to build lookup table V_ORDERS snapshot for Dup key found, key= O_CUSTKEY
	at org.apache.kylin.engine.spark.builder.CubeSnapshotBuilder$$anonfun$checkDupKey$1.apply(CubeSnapshotBuilder.scala:198)
	at org.apache.kylin.engine.spark.builder.CubeSnapshotBuilder$$anonfun$checkDupKey$1.apply(CubeSnapshotBuilder.scala:190)
	at scala.collection.IndexedSeqOptimized$class.foreach(IndexedSeqOptimized.scala:33)
	at scala.collection.mutable.ArrayOps$ofRef.foreach(ArrayOps.scala:186)
	at org.apache.kylin.engine.spark.builder.CubeSnapshotBuilder.checkDupKey(CubeSnapshotBuilder.scala:189)
	at org.apache.kylin.engine.spark.job.ParentSourceChooser.decideFlatTableSource(ParentSourceChooser.scala:83)
	at org.apache.kylin.engine.spark.job.ParentSourceChooser$$anonfun$decideSources$1.apply(ParentSourceChooser.scala:71)
	at org.apache.kylin.engine.spark.job.ParentSourceChooser$$anonfun$decideSources$1.apply(ParentSourceChooser.scala:66)
	at scala.collection.Iterator$class.foreach(Iterator.scala:893)
	at scala.collection.AbstractIterator.foreach(Iterator.scala:1336)
	at scala.collection.IterableLike$class.foreach(IterableLike.scala:72)
	at scala.collection.AbstractIterable.foreach(Iterable.scala:54)
	at org.apache.kylin.engine.spark.job.ParentSourceChooser.decideSources(ParentSourceChooser.scala:66)
	at org.apache.kylin.engine.spark.job.CubeBuildJob.doExecute(CubeBuildJob.java:178)
	at org.apache.kylin.engine.spark.application.SparkApplication.execute(SparkApplication.java:304)
	at org.apache.kylin.engine.spark.application.SparkApplication.execute(SparkApplication.java:93)
	... 4 more