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https://issues.apache.org/jira/browse/SPARK-16922?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15427264#comment-15427264
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Davies Liu commented on SPARK-16922:
------------------------------------

Which serializer are you using? java serializer or Kyro?

> Query with Broadcast Hash join fails due to executor OOM in Spark 2.0
> ---------------------------------------------------------------------
>
>                 Key: SPARK-16922
>                 URL: https://issues.apache.org/jira/browse/SPARK-16922
>             Project: Spark
>          Issue Type: Bug
>          Components: Shuffle
>    Affects Versions: 2.0.0
>            Reporter: Sital Kedia
>
> A query which used to work in Spark 1.6 fails with executor OOM in 2.0.
> Stack trace - 
> {code}
>       at 
> org.apache.spark.unsafe.types.UTF8String.getBytes(UTF8String.java:229)
>       at 
> org.apache.spark.sql.catalyst.expressions.GeneratedClass$GeneratedIterator$agg_VectorizedHashMap.hash$(Unknown
>  Source)
>       at 
> org.apache.spark.sql.catalyst.expressions.GeneratedClass$GeneratedIterator$agg_VectorizedHashMap.findOrInsert(Unknown
>  Source)
>       at 
> org.apache.spark.sql.catalyst.expressions.GeneratedClass$GeneratedIterator.agg_doAggregateWithKeys$(Unknown
>  Source)
>       at 
> org.apache.spark.sql.catalyst.expressions.GeneratedClass$GeneratedIterator.processNext(Unknown
>  Source)
>       at 
> org.apache.spark.sql.execution.BufferedRowIterator.hasNext(BufferedRowIterator.java:43)
>       at 
> org.apache.spark.sql.execution.WholeStageCodegenExec$$anonfun$8$$anon$1.hasNext(WholeStageCodegenExec.scala:370)
>       at scala.collection.Iterator$$anon$11.hasNext(Iterator.scala:408)
>       at 
> org.apache.spark.shuffle.sort.UnsafeShuffleWriter.write(UnsafeShuffleWriter.java:161)
>       at 
> org.apache.spark.scheduler.ShuffleMapTask.runTask(ShuffleMapTask.scala:79)
>       at 
> org.apache.spark.scheduler.ShuffleMapTask.runTask(ShuffleMapTask.scala:47)
>       at org.apache.spark.scheduler.Task.run(Task.scala:85)
>       at org.apache.spark.executor.Executor$TaskRunner.run(Executor.scala:274)
>       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)
> {code}
> Query plan in Spark 1.6
> {code}
> == Physical Plan ==
> TungstenAggregate(key=[field1#101], functions=[(sum((field2#74 / 
> 100.0)),mode=Final,isDistinct=false)], output=[field1#101,field3#3])
> +- TungstenExchange hashpartitioning(field1#101,200), None
>    +- TungstenAggregate(key=[field1#101], functions=[(sum((field2#74 / 
> 100.0)),mode=Partial,isDistinct=false)], output=[field1#101,sum#111])
>       +- Project [field1#101,field2#74]
>          +- BroadcastHashJoin [field5#63L], [cast(cast(field4#97 as 
> decimal(20,0)) as bigint)], BuildRight
>             :- ConvertToUnsafe
>             :  +- HiveTableScan [field2#74,field5#63L], MetastoreRelation 
> foo, table1, Some(a), [(ds#57 >= 2013-10-01),(ds#57 <= 2013-12-31)]
>             +- ConvertToUnsafe
>                +- HiveTableScan [field1#101,field4#97], MetastoreRelation 
> foo, table2, Some(b)
> {code}
> Query plan in 2.0
> {code}
> == Physical Plan ==
> *HashAggregate(keys=[field1#160], functions=[sum((field2#133 / 100.0))])
> +- Exchange hashpartitioning(field1#160, 200)
>    +- *HashAggregate(keys=[field1#160], functions=[partial_sum((field2#133 / 
> 100.0))])
>       +- *Project [field2#133, field1#160]
>          +- *BroadcastHashJoin [field5#122L], [cast(cast(field4#156 as 
> decimal(20,0)) as bigint)], Inner, BuildRight
>             :- *Filter isnotnull(field5#122L)
>             :  +- HiveTableScan [field5#122L, field2#133], MetastoreRelation 
> foo, table1, a, [isnotnull(ds#116), (ds#116 >= 2013-10-01), (ds#116 <= 
> 2013-12-31)]
>             +- BroadcastExchange 
> HashedRelationBroadcastMode(List(cast(cast(input[0, string, false] as 
> decimal(20,0)) as bigint)))
>                +- *Filter isnotnull(field4#156)
>                   +- HiveTableScan [field4#156, field1#160], 
> MetastoreRelation foo, table2, b
> {code}



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