Github user srowen commented on the issue:
https://github.com/apache/spark/pull/14961
Hm, no I take it back, it's a consistent failure that doesn't show up in
the main test builds (for any Hadoop version):
```
[info] - using external shuffle service *** FAILED *** (1 minute, 33
seconds)
[info] 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 11, localhost): java.io.IOException:
org.apache.spark.storage.BlockFetchException: Failed to fetch block after 1
fetch failures. Most recent failure cause:
[info] at
org.apache.spark.util.Utils$.tryOrIOException(Utils.scala:1260)
[info] at
org.apache.spark.broadcast.TorrentBroadcast.readBroadcastBlock(TorrentBroadcast.scala:174)
[info] at
org.apache.spark.broadcast.TorrentBroadcast._value$lzycompute(TorrentBroadcast.scala:65)
[info] at
org.apache.spark.broadcast.TorrentBroadcast._value(TorrentBroadcast.scala:65)
[info] at
org.apache.spark.broadcast.TorrentBroadcast.getValue(TorrentBroadcast.scala:89)
[info] at
org.apache.spark.broadcast.Broadcast.value(Broadcast.scala:70)
[info] at
org.apache.spark.scheduler.ShuffleMapTask.runTask(ShuffleMapTask.scala:72)
[info] at
org.apache.spark.scheduler.ShuffleMapTask.runTask(ShuffleMapTask.scala:47)
[info] at org.apache.spark.scheduler.Task.run(Task.scala:86)
[info] at
org.apache.spark.executor.Executor$TaskRunner.run(Executor.scala:274)
[info] at
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
[info] at
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
[info] at java.lang.Thread.run(Thread.java:745)
[info] Caused by: org.apache.spark.storage.BlockFetchException: Failed to
fetch block after 1 fetch failures. Most recent failure cause:
[info] at
org.apache.spark.storage.BlockManager.getRemoteBytes(BlockManager.scala:567)
[info] at
org.apache.spark.broadcast.TorrentBroadcast$$anonfun$org$apache$spark$broadcast$TorrentBroadcast$$readBlocks$1.apply$mcVI$sp(TorrentBroadcast.scala:136)
[info] at
org.apache.spark.broadcast.TorrentBroadcast$$anonfun$org$apache$spark$broadcast$TorrentBroadcast$$readBlocks$1.apply(TorrentBroadcast.scala:125)
[info] at
org.apache.spark.broadcast.TorrentBroadcast$$anonfun$org$apache$spark$broadcast$TorrentBroadcast$$readBlocks$1.apply(TorrentBroadcast.scala:125)
[info] at scala.collection.immutable.List.foreach(List.scala:381)
[info] at
org.apache.spark.broadcast.TorrentBroadcast.org$apache$spark$broadcast$TorrentBroadcast$$readBlocks(TorrentBroadcast.scala:125)
[info] at
org.apache.spark.broadcast.TorrentBroadcast$$anonfun$readBroadcastBlock$1.apply(TorrentBroadcast.scala:186)
[info] at
org.apache.spark.util.Utils$.tryOrIOException(Utils.scala:1253)
[info] ... 12 more
[info] Caused by: org.apache.spark.SparkException: Exception thrown in
awaitResult:
[info] at
org.apache.spark.util.ThreadUtils$.awaitResult(ThreadUtils.scala:194)
[info] at
org.apache.spark.network.BlockTransferService.fetchBlockSync(BlockTransferService.scala:104)
[info] at
org.apache.spark.storage.BlockManager.getRemoteBytes(BlockManager.scala:556)
[info] ... 19 more
[info] Caused by: java.io.IOException: Connection reset by peer
[info] at sun.nio.ch.FileDispatcherImpl.read0(Native Method)
[info] at sun.nio.ch.SocketDispatcher.read(SocketDispatcher.java:39)
[info] at sun.nio.ch.IOUtil.readIntoNativeBuffer(IOUtil.java:223)
[info] at sun.nio.ch.IOUtil.read(IOUtil.java:192)
[info] at sun.nio.ch.SocketChannelImpl.read(SocketChannelImpl.java:380)
[info] at
io.netty.buffer.PooledUnsafeDirectByteBuf.setBytes(PooledUnsafeDirectByteBuf.java:221)
[info] at
io.netty.buffer.AbstractByteBuf.writeBytes(AbstractByteBuf.java:899)
[info] at
io.netty.channel.socket.nio.NioSocketChannel.doReadBytes(NioSocketChannel.java:275)
[info] at
io.netty.channel.nio.AbstractNioByteChannel$NioByteUnsafe.read(AbstractNioByteChannel.java:119)
[info] at
io.netty.channel.nio.NioEventLoop.processSelectedKey(NioEventLoop.java:611)
[info] at
io.netty.channel.nio.NioEventLoop.processSelectedKeysOptimized(NioEventLoop.java:552)
[info] at
io.netty.channel.nio.NioEventLoop.processSelectedKeys(NioEventLoop.java:466)
[info] at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:438)
[info] at
io.netty.util.concurrent.SingleThreadEventExecutor$2.run(SingleThreadEventExecutor.java:140)
[info] at
io.netty.util.concurrent.DefaultThreadFactory$DefaultRunnableDecorator.run(DefaultThreadFactory.java:144)
[info] ... 1 more
[info]
```
The rest are knock-on errors.
Clearly something to do with the block fetcher no longer quite working, or
maybe failing to start. If you want to debug it I'd maybe scan `mvn
dependency:tree` to see if somehow this updated only one of several netty
artifacts and we somehow have a mismatched set now. (You will see Netty 3
artifacts from Hadoop but the question is whether something is stuck on 4.0.29).
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