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https://issues.apache.org/jira/browse/SPARK-25422?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16622505#comment-16622505
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Imran Rashid commented on SPARK-25422:
--------------------------------------
ok I think I figured this out -- the problem is that TorrentBroadcast disposes
of the bytebuffers after it adds them to the memorystore. That would have been
a no-op if they were regular byte buffers, but now they are memory-mapped from
a file, and so they might contain garbage after getting disposed.
I should have a real PR soon, just want to confirm my understanding of a few
things.
> flaky test: org.apache.spark.DistributedSuite.caching on disk, replicated
> (encryption = on) (with replication as stream)
> ------------------------------------------------------------------------------------------------------------------------
>
> Key: SPARK-25422
> URL: https://issues.apache.org/jira/browse/SPARK-25422
> Project: Spark
> Issue Type: Test
> Components: Spark Core
> Affects Versions: 2.4.0
> Reporter: Wenchen Fan
> Priority: Major
>
> stacktrace
> {code}
> org.apache.spark.SparkException: Job aborted due to stage failure: Task 0 in
> stage 0.0 failed 4 times, most recent failure: Lost task 0.3 in stage 0.0
> (TID 7, localhost, executor 1): java.io.IOException:
> org.apache.spark.SparkException: corrupt remote block broadcast_0_piece0 of
> broadcast_0: 1651574976 != 1165629262
> at org.apache.spark.util.Utils$.tryOrIOException(Utils.scala:1320)
> at
> org.apache.spark.broadcast.TorrentBroadcast.readBroadcastBlock(TorrentBroadcast.scala:207)
> at
> org.apache.spark.broadcast.TorrentBroadcast._value$lzycompute(TorrentBroadcast.scala:66)
> at
> org.apache.spark.broadcast.TorrentBroadcast._value(TorrentBroadcast.scala:66)
> at
> org.apache.spark.broadcast.TorrentBroadcast.getValue(TorrentBroadcast.scala:96)
> at org.apache.spark.broadcast.Broadcast.value(Broadcast.scala:70)
> at org.apache.spark.scheduler.ResultTask.runTask(ResultTask.scala:84)
> at org.apache.spark.scheduler.Task.run(Task.scala:121)
> at
> org.apache.spark.executor.Executor$TaskRunner$$anonfun$7.apply(Executor.scala:367)
> at org.apache.spark.util.Utils$.tryWithSafeFinally(Utils.scala:1347)
> at org.apache.spark.executor.Executor$TaskRunner.run(Executor.scala:373)
> at
> java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
> at
> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
> at java.lang.Thread.run(Thread.java:745)
> Caused by: org.apache.spark.SparkException: corrupt remote block
> broadcast_0_piece0 of broadcast_0: 1651574976 != 1165629262
> at
> org.apache.spark.broadcast.TorrentBroadcast$$anonfun$org$apache$spark$broadcast$TorrentBroadcast$$readBlocks$1.apply$mcVI$sp(TorrentBroadcast.scala:167)
> at
> org.apache.spark.broadcast.TorrentBroadcast$$anonfun$org$apache$spark$broadcast$TorrentBroadcast$$readBlocks$1.apply(TorrentBroadcast.scala:151)
> at
> org.apache.spark.broadcast.TorrentBroadcast$$anonfun$org$apache$spark$broadcast$TorrentBroadcast$$readBlocks$1.apply(TorrentBroadcast.scala:151)
> at scala.collection.immutable.List.foreach(List.scala:392)
> at
> org.apache.spark.broadcast.TorrentBroadcast.org$apache$spark$broadcast$TorrentBroadcast$$readBlocks(TorrentBroadcast.scala:151)
> at
> org.apache.spark.broadcast.TorrentBroadcast$$anonfun$readBroadcastBlock$1$$anonfun$apply$2.apply(TorrentBroadcast.scala:231)
> at scala.Option.getOrElse(Option.scala:121)
> at
> org.apache.spark.broadcast.TorrentBroadcast$$anonfun$readBroadcastBlock$1.apply(TorrentBroadcast.scala:211)
> at org.apache.spark.util.Utils$.tryOrIOException(Utils.scala:1313)
> ... 13 more
> {code}
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