[ 
https://issues.apache.org/jira/browse/SPARK-30720?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
 ]

Andrei Stankevich updated SPARK-30720:
--------------------------------------
    Description: 
We are using spark 2.4.3 with mesos and with external shuffle service. External 
shuffle service is launched using systemd by command
{code:java}
 /bin/bash -ce "exec /*/spark/bin/spark-class 
org.apache.spark.deploy.mesos.MesosExternalShuffleService"
{code}
Sometimes spark executor has connection timeout when it tries to connect to 
external shuffle service. When it happens spark executor throws an exception 

 
{noformat}
ERROR BlockManager: Failed to connect to external shuffle server, will retry 4 
more times after waiting 5 seconds...{noformat}
 

If connection timeout happens 4 more times spark executor throws an error

`ERROR CoarseGrainedExecutorBackend: Executor self-exiting due to : Unable to 
create executor due to Unable to register with external shuffle server due to : 
Failed to connect to our-host.com/10.103.*.*:7337`

 

After this error Spark application just hangs. On Mesos UI it goes to inactive 
frameworks and on Spark Driver UI I can see few failed tasks and looks like it 
does nothing.

 

Full spark executor log is 

```

20/01/31 16:27:09 ERROR BlockManager: Failed to connect to external shuffle 
server, will retry 1 more times after waiting 5 seconds...
 java.io.IOException: Failed to connect to our-host.com/10.103.*.*:7337
 at 
org.apache.spark.network.client.TransportClientFactory.createClient(TransportClientFactory.java:245)
 at 
org.apache.spark.network.client.TransportClientFactory.createUnmanagedClient(TransportClientFactory.java:201)
 at 
org.apache.spark.network.shuffle.ExternalShuffleClient.registerWithShuffleServer(ExternalShuffleClient.java:142)
 at 
org.apache.spark.storage.BlockManager.$anonfun$registerWithExternalShuffleServer$3(BlockManager.scala:295)
 at scala.collection.immutable.Range.foreach$mVc$sp(Range.scala:158)
 at 
org.apache.spark.storage.BlockManager.registerWithExternalShuffleServer(BlockManager.scala:291)
 at org.apache.spark.storage.BlockManager.initialize(BlockManager.scala:265)
 at org.apache.spark.executor.Executor.<init>(Executor.scala:118)
 at 
org.apache.spark.executor.CoarseGrainedExecutorBackend$$anonfun$receive$1.applyOrElse(CoarseGrainedExecutorBackend.scala:83)
 at org.apache.spark.rpc.netty.Inbox.$anonfun$process$1(Inbox.scala:117)
 at org.apache.spark.rpc.netty.Inbox.safelyCall(Inbox.scala:205)
 at org.apache.spark.rpc.netty.Inbox.process(Inbox.scala:102)
 at org.apache.spark.rpc.netty.Dispatcher$MessageLoop.run(Dispatcher.scala:221)
 at 
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
 at 
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
 at java.lang.Thread.run(Thread.java:748)
 Caused by: io.netty.channel.AbstractChannel$AnnotatedConnectException: 
Connection timed out: our-host.com/10.103.*.*:7337
 at sun.nio.ch.SocketChannelImpl.checkConnect(Native Method)
 at sun.nio.ch.SocketChannelImpl.finishConnect(SocketChannelImpl.java:717)
 at 
io.netty.channel.socket.nio.NioSocketChannel.doFinishConnect(NioSocketChannel.java:323)
 at 
io.netty.channel.nio.AbstractNioChannel$AbstractNioUnsafe.finishConnect(AbstractNioChannel.java:340)
 at io.netty.channel.nio.NioEventLoop.processSelectedKey(NioEventLoop.java:633)
 at 
io.netty.channel.nio.NioEventLoop.processSelectedKeysOptimized(NioEventLoop.java:580)
 at io.netty.channel.nio.NioEventLoop.processSelectedKeys(NioEventLoop.java:497)
 at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:459)
 at 
io.netty.util.concurrent.SingleThreadEventExecutor$5.run(SingleThreadEventExecutor.java:858)
 at 
io.netty.util.concurrent.DefaultThreadFactory$DefaultRunnableDecorator.run(DefaultThreadFactory.java:138)
 ... 1 more
 Caused by: java.net.ConnectException: Connection timed out
 ... 11 more
 20/01/31 16:29:25 ERROR CoarseGrainedExecutorBackend: Executor self-exiting 
due to : Unable to create executor due to Unable to register with external 
shuffle server due to : Failed to connect to our-host.com/10.103.*.*:7337
 org.apache.spark.SparkException: Unable to register with external shuffle 
server due to : Failed to connect to our-host.com/10.103.*.*:7337
 at 
org.apache.spark.storage.BlockManager.$anonfun$registerWithExternalShuffleServer$3(BlockManager.scala:304)
 at scala.collection.immutable.Range.foreach$mVc$sp(Range.scala:158)
 at 
org.apache.spark.storage.BlockManager.registerWithExternalShuffleServer(BlockManager.scala:291)
 at org.apache.spark.storage.BlockManager.initialize(BlockManager.scala:265)
 at org.apache.spark.executor.Executor.<init>(Executor.scala:118)
 at 
org.apache.spark.executor.CoarseGrainedExecutorBackend$$anonfun$receive$1.applyOrElse(CoarseGrainedExecutorBackend.scala:83)
 at org.apache.spark.rpc.netty.Inbox.$anonfun$process$1(Inbox.scala:117)
 at org.apache.spark.rpc.netty.Inbox.safelyCall(Inbox.scala:205)
 at org.apache.spark.rpc.netty.Inbox.process(Inbox.scala:102)
 at org.apache.spark.rpc.netty.Dispatcher$MessageLoop.run(Dispatcher.scala:221)
 at 
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
 at 
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
 at java.lang.Thread.run(Thread.java:748)
 Caused by: java.io.IOException: Failed to connect to 
our-host.com/10.103.*.*:7337
 at 
org.apache.spark.network.client.TransportClientFactory.createClient(TransportClientFactory.java:245)
 at 
org.apache.spark.network.client.TransportClientFactory.createUnmanagedClient(TransportClientFactory.java:201)
 at 
org.apache.spark.network.shuffle.ExternalShuffleClient.registerWithShuffleServer(ExternalShuffleClient.java:142)
 at 
org.apache.spark.storage.BlockManager.$anonfun$registerWithExternalShuffleServer$3(BlockManager.scala:295)
 ... 12 more
 Caused by: io.netty.channel.AbstractChannel$AnnotatedConnectException: 
Connection timed out: our-host.com/10.103.*.*:7337
 at sun.nio.ch.SocketChannelImpl.checkConnect(Native Method)
 at sun.nio.ch.SocketChannelImpl.finishConnect(SocketChannelImpl.java:717)
 at 
io.netty.channel.socket.nio.NioSocketChannel.doFinishConnect(NioSocketChannel.java:323)
 at 
io.netty.channel.nio.AbstractNioChannel$AbstractNioUnsafe.finishConnect(AbstractNioChannel.java:340)
 at io.netty.channel.nio.NioEventLoop.processSelectedKey(NioEventLoop.java:633)
 at 
io.netty.channel.nio.NioEventLoop.processSelectedKeysOptimized(NioEventLoop.java:580)
 at io.netty.channel.nio.NioEventLoop.processSelectedKeys(NioEventLoop.java:497)
 at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:459)
 at 
io.netty.util.concurrent.SingleThreadEventExecutor$5.run(SingleThreadEventExecutor.java:858)
 at 
io.netty.util.concurrent.DefaultThreadFactory$DefaultRunnableDecorator.run(DefaultThreadFactory.java:138)
 ... 1 more
 Caused by: java.net.ConnectException: Connection timed out
 ... 11 more
 20/01/31 16:29:25 INFO DiskBlockManager: Shutdown hook called
 20/01/31 16:29:25 INFO ShutdownHookManager: Shutdown hook called
 I0131 16:29:25.446748 3768 executor.cpp:1039] Command exited with status 1 
(pid: 3795)
 I0131 16:29:26.447976 3794 process.cpp:935] Stopped the socket accept loop

```

 

  was:
We are using spark 2.4.3 with mesos and with external shuffle service. External 
shuffle service is launched using systemd by command
{code:java}
exec /*/spark/bin/spark-class 
org.apache.spark.deploy.mesos.MesosExternalShuffleService
{code}
Sometimes spark executor has connection timeout when it tries to connect to 
external shuffle service. When it happens spark executor throws an exception 

`ERROR BlockManager: Failed to connect to external shuffle server, will retry 4 
more times after waiting 5 seconds...`

If connection timeout happens 4 more times spark executor throws an error

`ERROR CoarseGrainedExecutorBackend: Executor self-exiting due to : Unable to 
create executor due to Unable to register with external shuffle server due to : 
Failed to connect to our-host.com/10.103.*.*:7337`

 

After this error Spark application just hangs. On Mesos UI it goes to inactive 
frameworks and on Spark Driver UI I can see few failed tasks and looks like it 
does nothing.

 

Full spark executor log is 

```

20/01/31 16:27:09 ERROR BlockManager: Failed to connect to external shuffle 
server, will retry 1 more times after waiting 5 seconds...
 java.io.IOException: Failed to connect to our-host.com/10.103.*.*:7337
 at 
org.apache.spark.network.client.TransportClientFactory.createClient(TransportClientFactory.java:245)
 at 
org.apache.spark.network.client.TransportClientFactory.createUnmanagedClient(TransportClientFactory.java:201)
 at 
org.apache.spark.network.shuffle.ExternalShuffleClient.registerWithShuffleServer(ExternalShuffleClient.java:142)
 at 
org.apache.spark.storage.BlockManager.$anonfun$registerWithExternalShuffleServer$3(BlockManager.scala:295)
 at scala.collection.immutable.Range.foreach$mVc$sp(Range.scala:158)
 at 
org.apache.spark.storage.BlockManager.registerWithExternalShuffleServer(BlockManager.scala:291)
 at org.apache.spark.storage.BlockManager.initialize(BlockManager.scala:265)
 at org.apache.spark.executor.Executor.<init>(Executor.scala:118)
 at 
org.apache.spark.executor.CoarseGrainedExecutorBackend$$anonfun$receive$1.applyOrElse(CoarseGrainedExecutorBackend.scala:83)
 at org.apache.spark.rpc.netty.Inbox.$anonfun$process$1(Inbox.scala:117)
 at org.apache.spark.rpc.netty.Inbox.safelyCall(Inbox.scala:205)
 at org.apache.spark.rpc.netty.Inbox.process(Inbox.scala:102)
 at org.apache.spark.rpc.netty.Dispatcher$MessageLoop.run(Dispatcher.scala:221)
 at 
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
 at 
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
 at java.lang.Thread.run(Thread.java:748)
 Caused by: io.netty.channel.AbstractChannel$AnnotatedConnectException: 
Connection timed out: our-host.com/10.103.*.*:7337
 at sun.nio.ch.SocketChannelImpl.checkConnect(Native Method)
 at sun.nio.ch.SocketChannelImpl.finishConnect(SocketChannelImpl.java:717)
 at 
io.netty.channel.socket.nio.NioSocketChannel.doFinishConnect(NioSocketChannel.java:323)
 at 
io.netty.channel.nio.AbstractNioChannel$AbstractNioUnsafe.finishConnect(AbstractNioChannel.java:340)
 at io.netty.channel.nio.NioEventLoop.processSelectedKey(NioEventLoop.java:633)
 at 
io.netty.channel.nio.NioEventLoop.processSelectedKeysOptimized(NioEventLoop.java:580)
 at io.netty.channel.nio.NioEventLoop.processSelectedKeys(NioEventLoop.java:497)
 at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:459)
 at 
io.netty.util.concurrent.SingleThreadEventExecutor$5.run(SingleThreadEventExecutor.java:858)
 at 
io.netty.util.concurrent.DefaultThreadFactory$DefaultRunnableDecorator.run(DefaultThreadFactory.java:138)
 ... 1 more
 Caused by: java.net.ConnectException: Connection timed out
 ... 11 more
 20/01/31 16:29:25 ERROR CoarseGrainedExecutorBackend: Executor self-exiting 
due to : Unable to create executor due to Unable to register with external 
shuffle server due to : Failed to connect to our-host.com/10.103.*.*:7337
 org.apache.spark.SparkException: Unable to register with external shuffle 
server due to : Failed to connect to our-host.com/10.103.*.*:7337
 at 
org.apache.spark.storage.BlockManager.$anonfun$registerWithExternalShuffleServer$3(BlockManager.scala:304)
 at scala.collection.immutable.Range.foreach$mVc$sp(Range.scala:158)
 at 
org.apache.spark.storage.BlockManager.registerWithExternalShuffleServer(BlockManager.scala:291)
 at org.apache.spark.storage.BlockManager.initialize(BlockManager.scala:265)
 at org.apache.spark.executor.Executor.<init>(Executor.scala:118)
 at 
org.apache.spark.executor.CoarseGrainedExecutorBackend$$anonfun$receive$1.applyOrElse(CoarseGrainedExecutorBackend.scala:83)
 at org.apache.spark.rpc.netty.Inbox.$anonfun$process$1(Inbox.scala:117)
 at org.apache.spark.rpc.netty.Inbox.safelyCall(Inbox.scala:205)
 at org.apache.spark.rpc.netty.Inbox.process(Inbox.scala:102)
 at org.apache.spark.rpc.netty.Dispatcher$MessageLoop.run(Dispatcher.scala:221)
 at 
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
 at 
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
 at java.lang.Thread.run(Thread.java:748)
 Caused by: java.io.IOException: Failed to connect to 
our-host.com/10.103.*.*:7337
 at 
org.apache.spark.network.client.TransportClientFactory.createClient(TransportClientFactory.java:245)
 at 
org.apache.spark.network.client.TransportClientFactory.createUnmanagedClient(TransportClientFactory.java:201)
 at 
org.apache.spark.network.shuffle.ExternalShuffleClient.registerWithShuffleServer(ExternalShuffleClient.java:142)
 at 
org.apache.spark.storage.BlockManager.$anonfun$registerWithExternalShuffleServer$3(BlockManager.scala:295)
 ... 12 more
 Caused by: io.netty.channel.AbstractChannel$AnnotatedConnectException: 
Connection timed out: our-host.com/10.103.*.*:7337
 at sun.nio.ch.SocketChannelImpl.checkConnect(Native Method)
 at sun.nio.ch.SocketChannelImpl.finishConnect(SocketChannelImpl.java:717)
 at 
io.netty.channel.socket.nio.NioSocketChannel.doFinishConnect(NioSocketChannel.java:323)
 at 
io.netty.channel.nio.AbstractNioChannel$AbstractNioUnsafe.finishConnect(AbstractNioChannel.java:340)
 at io.netty.channel.nio.NioEventLoop.processSelectedKey(NioEventLoop.java:633)
 at 
io.netty.channel.nio.NioEventLoop.processSelectedKeysOptimized(NioEventLoop.java:580)
 at io.netty.channel.nio.NioEventLoop.processSelectedKeys(NioEventLoop.java:497)
 at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:459)
 at 
io.netty.util.concurrent.SingleThreadEventExecutor$5.run(SingleThreadEventExecutor.java:858)
 at 
io.netty.util.concurrent.DefaultThreadFactory$DefaultRunnableDecorator.run(DefaultThreadFactory.java:138)
 ... 1 more
 Caused by: java.net.ConnectException: Connection timed out
 ... 11 more
 20/01/31 16:29:25 INFO DiskBlockManager: Shutdown hook called
 20/01/31 16:29:25 INFO ShutdownHookManager: Shutdown hook called
 I0131 16:29:25.446748 3768 executor.cpp:1039] Command exited with status 1 
(pid: 3795)
 I0131 16:29:26.447976 3794 process.cpp:935] Stopped the socket accept loop

```

 


> Spark framework hangs and becomes inactive on Mesos UI if executor can not 
> connect to shuffle external service.
> ---------------------------------------------------------------------------------------------------------------
>
>                 Key: SPARK-30720
>                 URL: https://issues.apache.org/jira/browse/SPARK-30720
>             Project: Spark
>          Issue Type: Bug
>          Components: Spark Core
>    Affects Versions: 2.4.3
>            Reporter: Andrei Stankevich
>            Priority: Major
>
> We are using spark 2.4.3 with mesos and with external shuffle service. 
> External shuffle service is launched using systemd by command
> {code:java}
>  /bin/bash -ce "exec /*/spark/bin/spark-class 
> org.apache.spark.deploy.mesos.MesosExternalShuffleService"
> {code}
> Sometimes spark executor has connection timeout when it tries to connect to 
> external shuffle service. When it happens spark executor throws an exception 
>  
> {noformat}
> ERROR BlockManager: Failed to connect to external shuffle server, will retry 
> 4 more times after waiting 5 seconds...{noformat}
>  
> If connection timeout happens 4 more times spark executor throws an error
> `ERROR CoarseGrainedExecutorBackend: Executor self-exiting due to : Unable to 
> create executor due to Unable to register with external shuffle server due to 
> : Failed to connect to our-host.com/10.103.*.*:7337`
>  
> After this error Spark application just hangs. On Mesos UI it goes to 
> inactive frameworks and on Spark Driver UI I can see few failed tasks and 
> looks like it does nothing.
>  
> Full spark executor log is 
> ```
> 20/01/31 16:27:09 ERROR BlockManager: Failed to connect to external shuffle 
> server, will retry 1 more times after waiting 5 seconds...
>  java.io.IOException: Failed to connect to our-host.com/10.103.*.*:7337
>  at 
> org.apache.spark.network.client.TransportClientFactory.createClient(TransportClientFactory.java:245)
>  at 
> org.apache.spark.network.client.TransportClientFactory.createUnmanagedClient(TransportClientFactory.java:201)
>  at 
> org.apache.spark.network.shuffle.ExternalShuffleClient.registerWithShuffleServer(ExternalShuffleClient.java:142)
>  at 
> org.apache.spark.storage.BlockManager.$anonfun$registerWithExternalShuffleServer$3(BlockManager.scala:295)
>  at scala.collection.immutable.Range.foreach$mVc$sp(Range.scala:158)
>  at 
> org.apache.spark.storage.BlockManager.registerWithExternalShuffleServer(BlockManager.scala:291)
>  at org.apache.spark.storage.BlockManager.initialize(BlockManager.scala:265)
>  at org.apache.spark.executor.Executor.<init>(Executor.scala:118)
>  at 
> org.apache.spark.executor.CoarseGrainedExecutorBackend$$anonfun$receive$1.applyOrElse(CoarseGrainedExecutorBackend.scala:83)
>  at org.apache.spark.rpc.netty.Inbox.$anonfun$process$1(Inbox.scala:117)
>  at org.apache.spark.rpc.netty.Inbox.safelyCall(Inbox.scala:205)
>  at org.apache.spark.rpc.netty.Inbox.process(Inbox.scala:102)
>  at 
> org.apache.spark.rpc.netty.Dispatcher$MessageLoop.run(Dispatcher.scala:221)
>  at 
> java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
>  at 
> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
>  at java.lang.Thread.run(Thread.java:748)
>  Caused by: io.netty.channel.AbstractChannel$AnnotatedConnectException: 
> Connection timed out: our-host.com/10.103.*.*:7337
>  at sun.nio.ch.SocketChannelImpl.checkConnect(Native Method)
>  at sun.nio.ch.SocketChannelImpl.finishConnect(SocketChannelImpl.java:717)
>  at 
> io.netty.channel.socket.nio.NioSocketChannel.doFinishConnect(NioSocketChannel.java:323)
>  at 
> io.netty.channel.nio.AbstractNioChannel$AbstractNioUnsafe.finishConnect(AbstractNioChannel.java:340)
>  at 
> io.netty.channel.nio.NioEventLoop.processSelectedKey(NioEventLoop.java:633)
>  at 
> io.netty.channel.nio.NioEventLoop.processSelectedKeysOptimized(NioEventLoop.java:580)
>  at 
> io.netty.channel.nio.NioEventLoop.processSelectedKeys(NioEventLoop.java:497)
>  at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:459)
>  at 
> io.netty.util.concurrent.SingleThreadEventExecutor$5.run(SingleThreadEventExecutor.java:858)
>  at 
> io.netty.util.concurrent.DefaultThreadFactory$DefaultRunnableDecorator.run(DefaultThreadFactory.java:138)
>  ... 1 more
>  Caused by: java.net.ConnectException: Connection timed out
>  ... 11 more
>  20/01/31 16:29:25 ERROR CoarseGrainedExecutorBackend: Executor self-exiting 
> due to : Unable to create executor due to Unable to register with external 
> shuffle server due to : Failed to connect to our-host.com/10.103.*.*:7337
>  org.apache.spark.SparkException: Unable to register with external shuffle 
> server due to : Failed to connect to our-host.com/10.103.*.*:7337
>  at 
> org.apache.spark.storage.BlockManager.$anonfun$registerWithExternalShuffleServer$3(BlockManager.scala:304)
>  at scala.collection.immutable.Range.foreach$mVc$sp(Range.scala:158)
>  at 
> org.apache.spark.storage.BlockManager.registerWithExternalShuffleServer(BlockManager.scala:291)
>  at org.apache.spark.storage.BlockManager.initialize(BlockManager.scala:265)
>  at org.apache.spark.executor.Executor.<init>(Executor.scala:118)
>  at 
> org.apache.spark.executor.CoarseGrainedExecutorBackend$$anonfun$receive$1.applyOrElse(CoarseGrainedExecutorBackend.scala:83)
>  at org.apache.spark.rpc.netty.Inbox.$anonfun$process$1(Inbox.scala:117)
>  at org.apache.spark.rpc.netty.Inbox.safelyCall(Inbox.scala:205)
>  at org.apache.spark.rpc.netty.Inbox.process(Inbox.scala:102)
>  at 
> org.apache.spark.rpc.netty.Dispatcher$MessageLoop.run(Dispatcher.scala:221)
>  at 
> java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
>  at 
> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
>  at java.lang.Thread.run(Thread.java:748)
>  Caused by: java.io.IOException: Failed to connect to 
> our-host.com/10.103.*.*:7337
>  at 
> org.apache.spark.network.client.TransportClientFactory.createClient(TransportClientFactory.java:245)
>  at 
> org.apache.spark.network.client.TransportClientFactory.createUnmanagedClient(TransportClientFactory.java:201)
>  at 
> org.apache.spark.network.shuffle.ExternalShuffleClient.registerWithShuffleServer(ExternalShuffleClient.java:142)
>  at 
> org.apache.spark.storage.BlockManager.$anonfun$registerWithExternalShuffleServer$3(BlockManager.scala:295)
>  ... 12 more
>  Caused by: io.netty.channel.AbstractChannel$AnnotatedConnectException: 
> Connection timed out: our-host.com/10.103.*.*:7337
>  at sun.nio.ch.SocketChannelImpl.checkConnect(Native Method)
>  at sun.nio.ch.SocketChannelImpl.finishConnect(SocketChannelImpl.java:717)
>  at 
> io.netty.channel.socket.nio.NioSocketChannel.doFinishConnect(NioSocketChannel.java:323)
>  at 
> io.netty.channel.nio.AbstractNioChannel$AbstractNioUnsafe.finishConnect(AbstractNioChannel.java:340)
>  at 
> io.netty.channel.nio.NioEventLoop.processSelectedKey(NioEventLoop.java:633)
>  at 
> io.netty.channel.nio.NioEventLoop.processSelectedKeysOptimized(NioEventLoop.java:580)
>  at 
> io.netty.channel.nio.NioEventLoop.processSelectedKeys(NioEventLoop.java:497)
>  at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:459)
>  at 
> io.netty.util.concurrent.SingleThreadEventExecutor$5.run(SingleThreadEventExecutor.java:858)
>  at 
> io.netty.util.concurrent.DefaultThreadFactory$DefaultRunnableDecorator.run(DefaultThreadFactory.java:138)
>  ... 1 more
>  Caused by: java.net.ConnectException: Connection timed out
>  ... 11 more
>  20/01/31 16:29:25 INFO DiskBlockManager: Shutdown hook called
>  20/01/31 16:29:25 INFO ShutdownHookManager: Shutdown hook called
>  I0131 16:29:25.446748 3768 executor.cpp:1039] Command exited with status 1 
> (pid: 3795)
>  I0131 16:29:26.447976 3794 process.cpp:935] Stopped the socket accept loop
> ```
>  



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