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Review request for kylin, Dayue Gao, Dong Li, hongbin ma, and Wang Xiaoyu. Bugs: KYLIN-2684 https://issues.apache.org/jira/browse/KYLIN-2684 Repository: kylin Description ------- Failed to build cube with spark engine at "#7 Step Name: Build Cube with Spark". The error log is as following: Exception in thread "main" java.lang.RuntimeException: error execute org.apache.kylin.engine.spark.SparkCubingByLayer 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:57) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:606) at org.apache.spark.deploy.SparkSubmit$.org$apache$spark$deploy$SparkSubmit$$runMain(SparkSubmit.scala:731) at org.apache.spark.deploy.SparkSubmit$.doRunMain$1(SparkSubmit.scala:181) at org.apache.spark.deploy.SparkSubmit$.submit(SparkSubmit.scala:206) at org.apache.spark.deploy.SparkSubmit$.main(SparkSubmit.scala:121) at org.apache.spark.deploy.SparkSubmit.main(SparkSubmit.scala) Caused by: com.esotericsoftware.kryo.KryoException: java.lang.IllegalArgumentException: Class is not registered: Object Note: To register this class use: kryo.register(Object.class); Serialization trace: cuboidTreeLock (org.apache.kylin.cube.model.CubeDesc) at com.esotericsoftware.kryo.serializers.FieldSerializer$ObjectField.write(FieldSerializer.java:585) at com.esotericsoftware.kryo.serializers.FieldSerializer.write(FieldSerializer.java:213) at com.esotericsoftware.kryo.Kryo.writeClassAndObject(Kryo.java:568) at org.apache.spark.serializer.KryoSerializationStream.writeObject(KryoSerializer.scala:194) at org.apache.spark.broadcast.TorrentBroadcast$.blockifyObject(TorrentBroadcast.scala:203) at org.apache.spark.broadcast.TorrentBroadcast.writeBlocks(TorrentBroadcast.scala:102) at org.apache.spark.broadcast.TorrentBroadcast.<init>(TorrentBroadcast.scala:85) at org.apache.spark.broadcast.TorrentBroadcastFactory.newBroadcast(TorrentBroadcastFactory.scala:34) at org.apache.spark.broadcast.BroadcastManager.newBroadcast(BroadcastManager.scala:63) at org.apache.spark.SparkContext.broadcast(SparkContext.scala:1326) at org.apache.spark.api.java.JavaSparkContext.broadcast(JavaSparkContext.scala:639) at org.apache.kylin.engine.spark.SparkCubingByLayer.execute(SparkCubingByLayer.java:166) at org.apache.kylin.common.util.AbstractApplication.execute(AbstractApplication.java:37) ... 10 more Caused by: java.lang.IllegalArgumentException: Class is not registered: Object Note: To register this class use: kryo.register(Object.class); at com.esotericsoftware.kryo.Kryo.getRegistration(Kryo.java:442) at com.esotericsoftware.kryo.util.DefaultClassResolver.writeClass(DefaultClassResolver.java:79) at com.esotericsoftware.kryo.Kryo.writeClass(Kryo.java:472) at com.esotericsoftware.kryo.serializers.FieldSerializer$ObjectField.write(FieldSerializer.java:561) ... 22 more Change 'private Object cuboidTreeLock = new Object();' to 'private byte[] cuboidTreeLock = new byte[0];' in CubeDesc.java to solve this problem. Diffs ----- core-cube/src/main/java/org/apache/kylin/cube/model/CubeDesc.java 82d0b1b24 Diff: https://reviews.apache.org/r/60420/diff/1/ Testing ------- Thanks, pengjianhua