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https://issues.apache.org/jira/browse/SPARK-39044?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17528751#comment-17528751
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Willi Raschkowski commented on SPARK-39044:
-------------------------------------------
This worked on Spark 3.0.
[~beliefer], given we're hitting this in {{withBufferSerialized}}, I think this
might be related to SPARK-37203.
> AggregatingAccumulator with TypedImperativeAggregate throwing
> NullPointerException
> ----------------------------------------------------------------------------------
>
> Key: SPARK-39044
> URL: https://issues.apache.org/jira/browse/SPARK-39044
> Project: Spark
> Issue Type: Bug
> Components: SQL
> Affects Versions: 3.2.1
> Reporter: Willi Raschkowski
> Priority: Major
>
> We're using a custom TypedImperativeAggregate inside an
> AggregatingAccumulator (via {{observe()}} and get the error below. It looks
> like we're trying to serialize an aggregation buffer that hasn't been
> initialized yet.
> {code}
> Caused by: org.apache.spark.SparkException: Job aborted.
> at
> org.apache.spark.sql.errors.QueryExecutionErrors$.jobAbortedError(QueryExecutionErrors.scala:496)
> at
> org.apache.spark.sql.execution.datasources.FileFormatWriter$.write(FileFormatWriter.scala:251)
> at
> org.apache.spark.sql.execution.datasources.InsertIntoHadoopFsRelationCommand.run(InsertIntoHadoopFsRelationCommand.scala:186)
> at
> org.apache.spark.sql.execution.datasources.DataSource.writeAndRead(DataSource.scala:540)
> ...
> Caused by: org.apache.spark.SparkException: Job aborted due to stage failure:
> Task 9 in stage 1.0 failed 4 times, most recent failure: Lost task 9.3 in
> stage 1.0 (TID 32) (10.0.134.136 executor 3): java.io.IOException:
> java.lang.NullPointerException
> at org.apache.spark.util.Utils$.tryOrIOException(Utils.scala:1435)
> at
> org.apache.spark.scheduler.DirectTaskResult.writeExternal(TaskResult.scala:51)
> at
> java.base/java.io.ObjectOutputStream.writeExternalData(ObjectOutputStream.java:1460)
> at
> java.base/java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
> at
> java.base/java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1179)
> at
> java.base/java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:349)
> at
> org.apache.spark.serializer.JavaSerializationStream.writeObject(JavaSerializer.scala:46)
> at
> org.apache.spark.serializer.JavaSerializerInstance.serialize(JavaSerializer.scala:114)
> at org.apache.spark.executor.Executor$TaskRunner.run(Executor.scala:633)
> at
> java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128)
> at
> java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628)
> at java.base/java.lang.Thread.run(Thread.java:829)
> Caused by: java.lang.NullPointerException
> at
> org.apache.spark.sql.catalyst.expressions.aggregate.TypedImperativeAggregate.getBufferObject(interfaces.scala:638)
> at
> org.apache.spark.sql.catalyst.expressions.aggregate.TypedImperativeAggregate.getBufferObject(interfaces.scala:599)
> at
> org.apache.spark.sql.catalyst.expressions.aggregate.TypedImperativeAggregate.serializeAggregateBufferInPlace(interfaces.scala:621)
> at
> org.apache.spark.sql.execution.AggregatingAccumulator.withBufferSerialized(AggregatingAccumulator.scala:205)
> at
> org.apache.spark.sql.execution.AggregatingAccumulator.withBufferSerialized(AggregatingAccumulator.scala:33)
> at
> org.apache.spark.util.AccumulatorV2.writeReplace(AccumulatorV2.scala:186)
> at jdk.internal.reflect.GeneratedMethodAccessor49.invoke(Unknown Source)
> at
> java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
> at java.base/java.lang.reflect.Method.invoke(Method.java:566)
> at
> java.base/java.io.ObjectStreamClass.invokeWriteReplace(ObjectStreamClass.java:1235)
> at
> java.base/java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1137)
> at
> java.base/java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:349)
> at
> org.apache.spark.scheduler.DirectTaskResult.$anonfun$writeExternal$2(TaskResult.scala:55)
> at
> org.apache.spark.scheduler.DirectTaskResult.$anonfun$writeExternal$2$adapted(TaskResult.scala:55)
> at scala.collection.Iterator.foreach(Iterator.scala:943)
> at scala.collection.Iterator.foreach$(Iterator.scala:943)
> at scala.collection.AbstractIterator.foreach(Iterator.scala:1431)
> at scala.collection.IterableLike.foreach(IterableLike.scala:74)
> at scala.collection.IterableLike.foreach$(IterableLike.scala:73)
> at scala.collection.AbstractIterable.foreach(Iterable.scala:56)
> at
> org.apache.spark.scheduler.DirectTaskResult.$anonfun$writeExternal$1(TaskResult.scala:55)
> at
> scala.runtime.java8.JFunction0$mcV$sp.apply(JFunction0$mcV$sp.java:23)
> at org.apache.spark.util.Utils$.tryOrIOException(Utils.scala:1428)
> ... 11 more
> {code}
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