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https://issues.apache.org/jira/browse/SPARK-37301?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17442609#comment-17442609
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Apache Spark commented on SPARK-37301:
--------------------------------------
User 'mcdull-zhang' has created a pull request for this issue:
https://github.com/apache/spark/pull/34569
> ConcurrentModificationException caused by CollectionAccumulator serialization
> in the heartbeat thread
> -----------------------------------------------------------------------------------------------------
>
> Key: SPARK-37301
> URL: https://issues.apache.org/jira/browse/SPARK-37301
> Project: Spark
> Issue Type: Bug
> Components: Spark Core
> Affects Versions: 3.2.0
> Reporter: mcdull_zhang
> Priority: Minor
>
> In our production environment, you can use the following code to reproduce
> the problem:
> {code:scala}
> val acc = sc.collectionAccumulator[String]("test_acc")
>
> sc.parallelize(Array(0)).foreach(_ => {
> var i = 0
> var stop = false
> val start = System.currentTimeMillis()
> while (!stop) {
> acc.add(i.toString)
> if (i % 10000 == 0) {
> acc.reset()
> if ((System.currentTimeMillis() - start) / 1000 > 120) {
> stop = true
> }
> }
> i = i + 1
> }
> })
> sc.stop()
> {code}
> This code can make the executor fail to send heartbeats, even more than the
> default 60 times, and then the executor exits.
> {noformat}
> 21/11/11 21:00:23 WARN Executor: Issue communicating with driver in
> heartbeater
> org.apache.spark.SparkException: Exception thrown in awaitResult:
> at org.apache.spark.util.ThreadUtils$.awaitResult(ThreadUtils.scala:301)
> at org.apache.spark.rpc.RpcTimeout.awaitResult(RpcTimeout.scala:75)
> at org.apache.spark.rpc.RpcEndpointRef.askSync(RpcEndpointRef.scala:103)
> at org.apache.spark.executor.Executor.reportHeartBeat(Executor.scala:1007)
> at
> org.apache.spark.executor.Executor.$anonfun$heartbeater$1(Executor.scala:212)
> at scala.runtime.java8.JFunction0$mcV$sp.apply(JFunction0$mcV$sp.java:23)
> at org.apache.spark.util.Utils$.logUncaughtExceptions(Utils.scala:2019)
> at org.apache.spark.Heartbeater$$anon$1.run(Heartbeater.scala:46)
> at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
> at java.util.concurrent.FutureTask.runAndReset(FutureTask.java:308)
> at
> java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$301(ScheduledThreadPoolExecutor.java:180)
> at
> java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:294)
> 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:748)
> Caused by: java.util.ConcurrentModificationException
> at java.util.ArrayList.writeObject(ArrayList.java:766)
> at sun.reflect.GeneratedMethodAccessor6.invoke(Unknown Source)
> at
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
> at java.lang.reflect.Method.invoke(Method.java:498)
> at
> java.io.ObjectStreamClass.invokeWriteObject(ObjectStreamClass.java:1028)
> at
> java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1496)
> at
> java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1432)
> at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1178)
> at
> java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1548)
> at
> java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1509)
> at
> java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1432)
> at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1178)
> at java.io.ObjectOutputStream.writeArray(ObjectOutputStream.java:1378)
> at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1174)
> at
> java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1548)
> at
> java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1509)
> at
> java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1432)
> at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1178)
> at
> java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1548)
> at
> java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1509)
> at
> java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1432)
> at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1178)
> at java.io.ObjectOutputStream.writeArray(ObjectOutputStream.java:1378)
> at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1174)
> at
> java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1548)
> at
> java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1509)
> at
> java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1432)
> at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1178)
> at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:348)
> at
> org.apache.spark.serializer.JavaSerializationStream.writeObject(JavaSerializer.scala:44)
> at
> org.apache.spark.rpc.netty.RequestMessage.serialize(NettyRpcEnv.scala:601)
> at
> org.apache.spark.rpc.netty.NettyRpcEnv.askAbortable(NettyRpcEnv.scala:244)
> at
> org.apache.spark.rpc.netty.NettyRpcEndpointRef.askAbortable(NettyRpcEnv.scala:555)
> at
> org.apache.spark.rpc.netty.NettyRpcEndpointRef.ask(NettyRpcEnv.scala:559)
> at org.apache.spark.rpc.RpcEndpointRef.askSync(RpcEndpointRef.scala:102)
> ... 12 more
> 21/11/11 21:00:23 ERROR Executor: Exit as unable to send heartbeats to driver
> more than 60 times
> {noformat}
> The reason is that when the heartbeat thread serializes the Collection
> Accumulator, the task thread may modify the Collection Accumulator
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