LuciferYang commented on PR #37206:
URL: https://github.com/apache/spark/pull/37206#issuecomment-1186260386
The exceptions reported in SPARK-39696 are as follows:
```
2022-06-21 18:17:49.289Z ERROR [executor-heartbeater]
org.apache.spark.util.Utils - Uncaught exception in thread executor-heartbeater
java.util.ConcurrentModificationException: mutation occurred during iteration
at
scala.collection.mutable.MutationTracker$.checkMutations(MutationTracker.scala:43)
~[scala-library-2.13.8.jar:?]
at
scala.collection.mutable.CheckedIndexedSeqView$CheckedIterator.hasNext(CheckedIndexedSeqView.scala:47)
~[scala-library-2.13.8.jar:?]
at
scala.collection.IterableOnceOps.copyToArray(IterableOnce.scala:873)
~[scala-library-2.13.8.jar:?]
at
scala.collection.IterableOnceOps.copyToArray$(IterableOnce.scala:869)
~[scala-library-2.13.8.jar:?]
at
scala.collection.AbstractIterator.copyToArray(Iterator.scala:1293)
~[scala-library-2.13.8.jar:?]
at
scala.collection.IterableOnceOps.copyToArray(IterableOnce.scala:852)
~[scala-library-2.13.8.jar:?]
at
scala.collection.IterableOnceOps.copyToArray$(IterableOnce.scala:852)
~[scala-library-2.13.8.jar:?]
at
scala.collection.AbstractIterator.copyToArray(Iterator.scala:1293)
~[scala-library-2.13.8.jar:?]
at
scala.collection.immutable.VectorStatics$.append1IfSpace(Vector.scala:1959)
~[scala-library-2.13.8.jar:?]
at scala.collection.immutable.Vector1.appendedAll0(Vector.scala:425)
~[scala-library-2.13.8.jar:?]
at scala.collection.immutable.Vector.appendedAll(Vector.scala:203)
~[scala-library-2.13.8.jar:?]
at scala.collection.immutable.Vector.appendedAll(Vector.scala:113)
~[scala-library-2.13.8.jar:?]
at scala.collection.SeqOps.concat(Seq.scala:187)
~[scala-library-2.13.8.jar:?]
at scala.collection.SeqOps.concat$(Seq.scala:187)
~[scala-library-2.13.8.jar:?]
at scala.collection.AbstractSeq.concat(Seq.scala:1161)
~[scala-library-2.13.8.jar:?]
at scala.collection.IterableOps.$plus$plus(Iterable.scala:726)
~[scala-library-2.13.8.jar:?]
at scala.collection.IterableOps.$plus$plus$(Iterable.scala:726)
~[scala-library-2.13.8.jar:?]
at scala.collection.AbstractIterable.$plus$plus(Iterable.scala:926)
~[scala-library-2.13.8.jar:?]
at
org.apache.spark.executor.TaskMetrics.accumulators(TaskMetrics.scala:261)
~[spark-core_2.13-3.3.0.jar:3.3.0]
at
org.apache.spark.executor.Executor.$anonfun$reportHeartBeat$1(Executor.scala:1042)
~[spark-core_2.13-3.3.0.jar:3.3.0]
at scala.collection.IterableOnceOps.foreach(IterableOnce.scala:563)
~[scala-library-2.13.8.jar:?]
at scala.collection.IterableOnceOps.foreach$(IterableOnce.scala:561)
~[scala-library-2.13.8.jar:?]
at scala.collection.AbstractIterable.foreach(Iterable.scala:926)
~[scala-library-2.13.8.jar:?]
at
org.apache.spark.executor.Executor.reportHeartBeat(Executor.scala:1036)
~[spark-core_2.13-3.3.0.jar:3.3.0]
at
org.apache.spark.executor.Executor.$anonfun$heartbeater$1(Executor.scala:238)
~[spark-core_2.13-3.3.0.jar:3.3.0]
at
scala.runtime.java8.JFunction0$mcV$sp.apply(JFunction0$mcV$sp.scala:18)
~[scala-library-2.13.8.jar:?]
at
org.apache.spark.util.Utils$.logUncaughtExceptions(Utils.scala:2066)
~[spark-core_2.13-3.3.0.jar:3.3.0]
at org.apache.spark.Heartbeater$$anon$1.run(Heartbeater.scala:46)
~[spark-core_2.13-3.3.0.jar:3.3.0]
at
java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:539) ~[?:?]
at java.util.concurrent.FutureTask.runAndReset(FutureTask.java:305)
~[?:?]
at
java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:305)
~[?:?]
at
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1136)
~[?:?]
at
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:635)
~[?:?]
at java.lang.Thread.run(Thread.java:833) ~[?:?]
```
It seems to be a small probability event
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