[HIVE-19388] ClassCastException during VectorMapJoinCommonOperator initialization

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 2.1.1, 2.2.0, 2.3.2, 3.1.0, 3.0.0
• Fix Version/s: 2.4.0, 4.0.0-alpha-1
• Assignee: Vihang Karajgaonkar
• Reporter: Vihang Karajgaonkar
• Created: 02/May/18 21:46
• Updated: 17/Nov/22 08:55
• Resolved: 07/May/18 21:19

Description

I see the following exceptions when I a mapjoin operator is being initialized on Hive-on-Spark and when vectorization is turned on.

This happens when the hashTable is empty. The code in MapJoinTableContainerSerDe#getDefaultEmptyContainer method returns a HashMapWrapper while the VectorMapJoinOperator expects a MapJoinBytesTableContainer when hive.mapjoin.optimized.hashtable is set to true.

Caused by: java.lang.ClassCastException: org.apache.hadoop.hive.ql.exec.persistence.HashMapWrapper cannot be cast to org.apache.hadoop.hive.ql.exec.persistence.MapJoinTableContainerDirectAccess
 at org.apache.hadoop.hive.ql.exec.vector.mapjoin.optimized.VectorMapJoinOptimizedHashTable.<init>(VectorMapJoinOptimizedHashTable.java:92) ~[hive-exec-3.1.0-SNAPSHOT.jar:3.1.0-SNAPSHOT]
 at org.apache.hadoop.hive.ql.exec.vector.mapjoin.optimized.VectorMapJoinOptimizedHashMap.<init>(VectorMapJoinOptimizedHashMap.java:127) ~[hive-exec-3.1.0-SNAPSHOT.jar:3.1.0-SNAPSHOT]
 at org.apache.hadoop.hive.ql.exec.vector.mapjoin.optimized.VectorMapJoinOptimizedStringHashMap.<init>(VectorMapJoinOptimizedStringHashMap.java:60) ~[hive-exec-3.1.0-SNAPSHOT.jar:3.1.0-SNAPSHOT]
 at org.apache.hadoop.hive.ql.exec.vector.mapjoin.optimized.VectorMapJoinOptimizedCreateHashTable.createHashTable(VectorMapJoinOptimizedCreateHashTable.java:80) ~[hive-exec-3.1.0-SNAPSHOT.jar:3.1.0-SNAPSHOT]
 at org.apache.hadoop.hive.ql.exec.vector.mapjoin.VectorMapJoinCommonOperator.setUpHashTable(VectorMapJoinCommonOperator.java:485) ~[hive-exec-3.1.0-SNAPSHOT.jar:3.1.0-SNAPSHOT]
 at org.apache.hadoop.hive.ql.exec.vector.mapjoin.VectorMapJoinCommonOperator.completeInitializationOp(VectorMapJoinCommonOperator.java:461) ~[hive-exec-3.1.0-SNAPSHOT.jar:3.1.0-SNAPSHOT]
 at org.apache.hadoop.hive.ql.exec.Operator.completeInitialization(Operator.java:471) ~[hive-exec-3.1.0-SNAPSHOT.jar:3.1.0-SNAPSHOT]
 at org.apache.hadoop.hive.ql.exec.Operator.initialize(Operator.java:401) ~[hive-exec-3.1.0-SNAPSHOT.jar:3.1.0-SNAPSHOT]
 at org.apache.hadoop.hive.ql.exec.Operator.initialize(Operator.java:574) ~[hive-exec-3.1.0-SNAPSHOT.jar:3.1.0-SNAPSHOT]
 at org.apache.hadoop.hive.ql.exec.Operator.initializeChildren(Operator.java:526) ~[hive-exec-3.1.0-SNAPSHOT.jar:3.1.0-SNAPSHOT]
 at org.apache.hadoop.hive.ql.exec.Operator.initialize(Operator.java:387) ~[hive-exec-3.1.0-SNAPSHOT.jar:3.1.0-SNAPSHOT]
 at org.apache.hadoop.hive.ql.exec.spark.SparkMapRecordHandler.init(SparkMapRecordHandler.java:109) ~[hive-exec-3.1.0-SNAPSHOT.jar:3.1.0-SNAPSHOT]
 ... 16 more