Huw created SPARK-45176:
---------------------------
Summary: AggregatingAccumulator with TypedImperativeAggregate
throwing ClassCastException
Key: SPARK-45176
URL: https://issues.apache.org/jira/browse/SPARK-45176
Project: Spark
Issue Type: Bug
Components: SQL
Affects Versions: 3.4.1, 3.4.0
Reporter: Huw
Probably related to SPARK-39044. But potentially also this comment in
Executor.scala.
// TODO: do not serialize value twice
val directResult = new DirectTaskResult(valueByteBuffer, accumUpdates,
metricPeaks)
The class cast exception I'm seeing is
java.lang.ClassCastException: class [B cannot be cast to class
org.apache.spark.sql.catalyst.expressions.aggregate.Reservoir
But I've seen it with other aggregation buffers like QuantileSummaries as well.
It's my belief that
withBufferSerialized()
for the Aggregating Accumulator is being called twice, leading to on
serializeAggregateBuffernPlace(buffer)
also being called twice for the an Imperative aggregate, the second time round,
the buffer is already a byte array and the asInstanceOf[T] in getBufferObject
is throwing.
This doesn't appear to happen on all runs, and it might be its only occurring
when there's a transitive exception. I have a further suspicion that the cause
might originate with
SerializationDebugger.improveException
which is traversing the task and forcing writeExternal, to be called.
Setting
|spark.serializer.extraDebugInfo|false|
Seems to make things a bit more reliable (I haven't seen the error while this
setting is on), and points strongly in that direction.
Stack trace:
Job aborted due to stage failure: Authorized committer (attemptNumber=0,
stage=15, partition=10) failed; but task commit success, data duplication may
happen.
reason=ExceptionFailure(java.io.IOException,java.lang.ClassCastException: class
[B cannot be cast to class
org.apache.spark.sql.catalyst.expressions.aggregate.Reservoir ([B is in module
java.base of loader 'bootstrap';
org.apache.spark.sql.catalyst.expressions.aggregate.Reservoir is in unnamed
module of loader
'app'),[Ljava.lang.StackTraceElement;@7fe2f462,java.io.IOException:
java.lang.ClassCastException: class [B cannot be cast to class
org.apache.spark.sql.catalyst.expressions.aggregate.Reservoir ([B is in module
java.base of loader 'bootstrap';
org.apache.spark.sql.catalyst.expressions.aggregate.Reservoir is in unnamed
module of loader 'app')
at org.apache.spark.util.Utils$.tryOrIOException(Utils.scala:1502)
at
org.apache.spark.scheduler.DirectTaskResult.writeExternal(TaskResult.scala:59)
at java.base/java.io.ObjectOutputStream.writeExternalData(Unknown
Source)
at java.base/java.io.ObjectOutputStream.writeOrdinaryObject(Unknown
Source)
at java.base/java.io.ObjectOutputStream.writeObject0(Unknown Source)
at java.base/java.io.ObjectOutputStream.writeObject(Unknown Source)
at
org.apache.spark.serializer.JavaSerializationStream.writeObject(JavaSerializer.scala:46)
at
org.apache.spark.serializer.SerializerHelper$.serializeToChunkedBuffer(SerializerHelper.scala:42)
at org.apache.spark.executor.Executor$TaskRunner.run(Executor.scala:643)
at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown
Source)
at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown
Source)
at java.base/java.lang.Thread.run(Unknown Source)
Caused by: java.lang.ClassCastException: class [B cannot be cast to class
org.apache.spark.sql.catalyst.expressions.aggregate.Reservoir ([B is in module
java.base of loader 'bootstrap';
org.apache.spark.sql.catalyst.expressions.aggregate.Reservoir is in unnamed
module of loader 'app')
at
org.apache.spark.sql.catalyst.expressions.aggregate.ReservoirSample.serialize(ReservoirSample.scala:33)
at
org.apache.spark.sql.catalyst.expressions.aggregate.TypedImperativeAggregate.serializeAggregateBufferInPlace(interfaces.scala:624)
at
org.apache.spark.sql.execution.AggregatingAccumulator.withBufferSerialized(AggregatingAccumulator.scala:206)
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.GeneratedMethodAccessor62.invoke(Unknown Source)
at
java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(Unknown
Source)
at java.base/java.lang.reflect.Method.invoke(Unknown Source)
at java.base/java.io.ObjectStreamClass.invokeWriteReplace(Unknown
Source)
at java.base/java.io.ObjectOutputStream.writeObject0(Unknown Source)
at java.base/java.io.ObjectOutputStream.writeObject(Unknown Source)
at
org.apache.spark.scheduler.DirectTaskResult.$anonfun$writeExternal$2(TaskResult.scala:62)
at
org.apache.spark.scheduler.DirectTaskResult.$anonfun$writeExternal$2$adapted(TaskResult.scala:62)
at scala.collection.immutable.Vector.foreach(Vector.scala:1856)
at
org.apache.spark.scheduler.DirectTaskResult.$anonfun$writeExternal$1(TaskResult.scala:62)
at
scala.runtime.java8.JFunction0$mcV$sp.apply(JFunction0$mcV$sp.scala:18)
at org.apache.spark.util.Utils$.tryOrIOException(Utils.scala:1495)
... 11 more
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