[
https://issues.apache.org/jira/browse/FLINK-4632?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15714684#comment-15714684
]
刘喆 edited comment on FLINK-4632 at 12/2/16 10:10 AM:
-----------------------------------------------------
It appears again. This time, there is no container lost.
This time I get the logs.
On JobManager:
2016-12-02 16:27:17,275 INFO
org.apache.flink.runtime.executiongraph.ExecutionGraph - Sink: Unnamed
(1/10) (ca18e99f339595bf987913f543ef3f54) switched from DEPLOYING to RUNNING
2016-12-02 16:27:17,292 INFO
org.apache.flink.runtime.executiongraph.ExecutionGraph - Sink: Unnamed
(5/10) (733ebe58c797aa6e6ed9e85004d6c201) switched from DEPLOYING to RUNNING
2016-12-02 16:27:48,523 INFO
org.apache.flink.runtime.executiongraph.ExecutionGraph - Sink: Unnamed
(9/10) (fa903c45717171026fae9997ec22b594) switched from RUNNING to FAILED
2016-12-02 16:27:48,523 INFO
org.apache.flink.runtime.executiongraph.ExecutionGraph - Job Flink
Streaming Java API Skeleton (c7b96c59cb04fd2cd096b23f85cebdb4) switched from
state RUNNING to FAILING.
org.apache.flink.runtime.io.network.netty.exception.LocalTransportException:
Connection timed out
at
org.apache.flink.runtime.io.network.netty.PartitionRequestClientHandler.exceptionCaught(PartitionRequestClientHandler.java:152)
at
io.netty.channel.AbstractChannelHandlerContext.invokeExceptionCaught(AbstractChannelHandlerContext.java:275)
at
io.netty.channel.AbstractChannelHandlerContext.fireExceptionCaught(AbstractChannelHandlerContext.java:253)
at
io.netty.channel.ChannelInboundHandlerAdapter.exceptionCaught(ChannelInboundHandlerAdapter.java:131)
at
io.netty.channel.AbstractChannelHandlerContext.invokeExceptionCaught(AbstractChannelHandlerContext.java:275)
at
io.netty.channel.AbstractChannelHandlerContext.fireExceptionCaught(AbstractChannelHandlerContext.java:253)
at
io.netty.channel.ChannelInboundHandlerAdapter.exceptionCaught(ChannelInboundHandlerAdapter.java:131)
at
io.netty.channel.AbstractChannelHandlerContext.invokeExceptionCaught(AbstractChannelHandlerContext.java:275)
at
io.netty.channel.AbstractChannelHandlerContext.fireExceptionCaught(AbstractChannelHandlerContext.java:253)
at
io.netty.channel.ChannelHandlerAdapter.exceptionCaught(ChannelHandlerAdapter.java:79)
at
io.netty.channel.AbstractChannelHandlerContext.invokeExceptionCaught(AbstractChannelHandlerContext.java:275)
at
io.netty.channel.AbstractChannelHandlerContext.fireExceptionCaught(AbstractChannelHandlerContext.java:253)
at
io.netty.channel.DefaultChannelPipeline.fireExceptionCaught(DefaultChannelPipeline.java:835)
at
io.netty.channel.nio.AbstractNioByteChannel$NioByteUnsafe.handleReadException(AbstractNioByteChannel.java:87)
at
io.netty.channel.nio.AbstractNioByteChannel$NioByteUnsafe.read(AbstractNioByteChannel.java:162)
at
io.netty.channel.nio.NioEventLoop.processSelectedKey(NioEventLoop.java:511)
at
io.netty.channel.nio.NioEventLoop.processSelectedKeysOptimized(NioEventLoop.java:468)
at
io.netty.channel.nio.NioEventLoop.processSelectedKeys(NioEventLoop.java:382)
at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:354)
at
io.netty.util.concurrent.SingleThreadEventExecutor$2.run(SingleThreadEventExecutor.java:111)
at java.lang.Thread.run(Thread.java:745)
Caused by: java.io.IOException: Connection timed out
at sun.nio.ch.FileDispatcherImpl.read0(Native Method)
at sun.nio.ch.SocketDispatcher.read(SocketDispatcher.java:39)
at sun.nio.ch.IOUtil.readIntoNativeBuffer(IOUtil.java:223)
at sun.nio.ch.IOUtil.read(IOUtil.java:192)
at sun.nio.ch.SocketChannelImpl.read(SocketChannelImpl.java:380)
at
io.netty.buffer.PooledUnsafeDirectByteBuf.setBytes(PooledUnsafeDirectByteBuf.java:311)
at io.netty.buffer.AbstractByteBuf.writeBytes(AbstractByteBuf.java:881)
at
io.netty.channel.socket.nio.NioSocketChannel.doReadBytes(NioSocketChannel.java:241)
at
io.netty.channel.nio.AbstractNioByteChannel$NioByteUnsafe.read(AbstractNioByteChannel.java:119)
... 6 more
2016-12-02 16:27:48,524 INFO
org.apache.flink.runtime.executiongraph.ExecutionGraph - Source: Custom
Source -> Map (1/10) (d99ba0f0a16c31e717c8044e92e0e8c4) switched from RUNNING
to CANCELING
2016-12-02 16:27:48,524 INFO
org.apache.flink.runtime.executiongraph.ExecutionGraph - Source: Custom
Source -> Map (2/10) (294b46febec5e49a8a859d98ceca2a9e) switched from RUNNING
to CANCELING
on TaskManager:
2016-12-02 16:27:18,177 INFO org.apache.zookeeper.ClientCnxn
- Socket connection established to 10.10.10.203/10.10.10.203:2181,
initiating session
2016-12-02 16:27:18,183 INFO org.apache.zookeeper.ClientCnxn
- Session establishment complete on server
10.10.10.203/10.10.10.203:2181, sessionid = 0x
358be99d7b900a1, negotiated timeout = 40000
2016-12-02 16:27:18,184 INFO
org.apache.flink.shaded.org.apache.curator.framework.state.ConnectionStateManager
- State change: CONNECTED
2016-12-02 16:27:18,191 INFO
org.apache.flink.streaming.connectors.kafka.internals.ZookeeperOffsetHandler -
Offset for TopicPartition pview:8 was set to 68844710011 in ZooKeeper.
Seeking fetcher to that position.
2016-12-02 16:27:18,191 INFO
org.apache.flink.streaming.connectors.kafka.internals.Kafka08Fetcher -
Starting periodic offset committer, with commit interval of 60000ms
2016-12-02 16:27:18,192 INFO
org.apache.flink.streaming.connectors.kafka.internals.Kafka08Fetcher -
Assigning 1 partitions to broker threads
2016-12-02 16:27:18,192 INFO
org.apache.flink.streaming.connectors.kafka.internals.Kafka08Fetcher -
Refreshing leader information for partitions [Partition: KafkaTopicPartition{to
pic='pview', partition=8}, KafkaPartitionHandle=[pview,8], offset=68844710010]
2016-12-02 16:27:18,216 INFO
org.apache.flink.streaming.connectors.kafka.FlinkKafkaConsumerBase - Trying to
get topic metadata from broker 10.10.10.203:9092 in try 0/3
2016-12-02 16:27:18,221 INFO
org.apache.flink.streaming.connectors.kafka.internals.Kafka08Fetcher -
Starting thread SimpleConsumer - Source: Custom Source -> Map - broker-3 (wx-ka
fka-08:9092)
2016-12-02 16:27:18,221 INFO
org.apache.flink.streaming.connectors.kafka.internals.SimpleConsumerThread -
Starting to fetch from [Partition: KafkaTopicPartition{topic='pview', par
tition=8}, KafkaPartitionHandle=[pview,8], offset=68844710010]
2016-12-02 16:27:48,472 ERROR org.apache.flink.runtime.taskmanager.Task
- Task execution failed.
org.apache.flink.runtime.io.network.netty.exception.LocalTransportException:
Connection timed out
at
org.apache.flink.runtime.io.network.netty.PartitionRequestClientHandler.exceptionCaught(PartitionRequestClientHandler.java:152)
at
io.netty.channel.AbstractChannelHandlerContext.invokeExceptionCaught(AbstractChannelHandlerContext.java:275)
at
io.netty.channel.AbstractChannelHandlerContext.fireExceptionCaught(AbstractChannelHandlerContext.java:253)
at
io.netty.channel.ChannelInboundHandlerAdapter.exceptionCaught(ChannelInboundHandlerAdapter.java:131)
at
io.netty.channel.AbstractChannelHandlerContext.invokeExceptionCaught(AbstractChannelHandlerContext.java:275)
at
io.netty.channel.AbstractChannelHandlerContext.fireExceptionCaught(AbstractChannelHandlerContext.java:253)
at
io.netty.channel.ChannelInboundHandlerAdapter.exceptionCaught(ChannelInboundHandlerAdapter.java:131)
...... ( as JobManager logs above)
was (Author: liuzhe):
It appears again.
This time I get the logs.
On JobManager:
2016-12-02 16:27:17,275 INFO
org.apache.flink.runtime.executiongraph.ExecutionGraph - Sink: Unnamed
(1/10) (ca18e99f339595bf987913f543ef3f54) switched from DEPLOYING to RUNNING
2016-12-02 16:27:17,292 INFO
org.apache.flink.runtime.executiongraph.ExecutionGraph - Sink: Unnamed
(5/10) (733ebe58c797aa6e6ed9e85004d6c201) switched from DEPLOYING to RUNNING
2016-12-02 16:27:48,523 INFO
org.apache.flink.runtime.executiongraph.ExecutionGraph - Sink: Unnamed
(9/10) (fa903c45717171026fae9997ec22b594) switched from RUNNING to FAILED
2016-12-02 16:27:48,523 INFO
org.apache.flink.runtime.executiongraph.ExecutionGraph - Job Flink
Streaming Java API Skeleton (c7b96c59cb04fd2cd096b23f85cebdb4) switched from
state RUNNING to FAILING.
org.apache.flink.runtime.io.network.netty.exception.LocalTransportException:
Connection timed out
at
org.apache.flink.runtime.io.network.netty.PartitionRequestClientHandler.exceptionCaught(PartitionRequestClientHandler.java:152)
at
io.netty.channel.AbstractChannelHandlerContext.invokeExceptionCaught(AbstractChannelHandlerContext.java:275)
at
io.netty.channel.AbstractChannelHandlerContext.fireExceptionCaught(AbstractChannelHandlerContext.java:253)
at
io.netty.channel.ChannelInboundHandlerAdapter.exceptionCaught(ChannelInboundHandlerAdapter.java:131)
at
io.netty.channel.AbstractChannelHandlerContext.invokeExceptionCaught(AbstractChannelHandlerContext.java:275)
at
io.netty.channel.AbstractChannelHandlerContext.fireExceptionCaught(AbstractChannelHandlerContext.java:253)
at
io.netty.channel.ChannelInboundHandlerAdapter.exceptionCaught(ChannelInboundHandlerAdapter.java:131)
at
io.netty.channel.AbstractChannelHandlerContext.invokeExceptionCaught(AbstractChannelHandlerContext.java:275)
at
io.netty.channel.AbstractChannelHandlerContext.fireExceptionCaught(AbstractChannelHandlerContext.java:253)
at
io.netty.channel.ChannelHandlerAdapter.exceptionCaught(ChannelHandlerAdapter.java:79)
at
io.netty.channel.AbstractChannelHandlerContext.invokeExceptionCaught(AbstractChannelHandlerContext.java:275)
at
io.netty.channel.AbstractChannelHandlerContext.fireExceptionCaught(AbstractChannelHandlerContext.java:253)
at
io.netty.channel.DefaultChannelPipeline.fireExceptionCaught(DefaultChannelPipeline.java:835)
at
io.netty.channel.nio.AbstractNioByteChannel$NioByteUnsafe.handleReadException(AbstractNioByteChannel.java:87)
at
io.netty.channel.nio.AbstractNioByteChannel$NioByteUnsafe.read(AbstractNioByteChannel.java:162)
at
io.netty.channel.nio.NioEventLoop.processSelectedKey(NioEventLoop.java:511)
at
io.netty.channel.nio.NioEventLoop.processSelectedKeysOptimized(NioEventLoop.java:468)
at
io.netty.channel.nio.NioEventLoop.processSelectedKeys(NioEventLoop.java:382)
at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:354)
at
io.netty.util.concurrent.SingleThreadEventExecutor$2.run(SingleThreadEventExecutor.java:111)
at java.lang.Thread.run(Thread.java:745)
Caused by: java.io.IOException: Connection timed out
at sun.nio.ch.FileDispatcherImpl.read0(Native Method)
at sun.nio.ch.SocketDispatcher.read(SocketDispatcher.java:39)
at sun.nio.ch.IOUtil.readIntoNativeBuffer(IOUtil.java:223)
at sun.nio.ch.IOUtil.read(IOUtil.java:192)
at sun.nio.ch.SocketChannelImpl.read(SocketChannelImpl.java:380)
at
io.netty.buffer.PooledUnsafeDirectByteBuf.setBytes(PooledUnsafeDirectByteBuf.java:311)
at io.netty.buffer.AbstractByteBuf.writeBytes(AbstractByteBuf.java:881)
at
io.netty.channel.socket.nio.NioSocketChannel.doReadBytes(NioSocketChannel.java:241)
at
io.netty.channel.nio.AbstractNioByteChannel$NioByteUnsafe.read(AbstractNioByteChannel.java:119)
... 6 more
2016-12-02 16:27:48,524 INFO
org.apache.flink.runtime.executiongraph.ExecutionGraph - Source: Custom
Source -> Map (1/10) (d99ba0f0a16c31e717c8044e92e0e8c4) switched from RUNNING
to CANCELING
2016-12-02 16:27:48,524 INFO
org.apache.flink.runtime.executiongraph.ExecutionGraph - Source: Custom
Source -> Map (2/10) (294b46febec5e49a8a859d98ceca2a9e) switched from RUNNING
to CANCELING
on TaskManager:
2016-12-02 16:27:18,177 INFO org.apache.zookeeper.ClientCnxn
- Socket connection established to 10.10.10.203/10.10.10.203:2181,
initiating session
2016-12-02 16:27:18,183 INFO org.apache.zookeeper.ClientCnxn
- Session establishment complete on server
10.10.10.203/10.10.10.203:2181, sessionid = 0x
358be99d7b900a1, negotiated timeout = 40000
2016-12-02 16:27:18,184 INFO
org.apache.flink.shaded.org.apache.curator.framework.state.ConnectionStateManager
- State change: CONNECTED
2016-12-02 16:27:18,191 INFO
org.apache.flink.streaming.connectors.kafka.internals.ZookeeperOffsetHandler -
Offset for TopicPartition pview:8 was set to 68844710011 in ZooKeeper.
Seeking fetcher to that position.
2016-12-02 16:27:18,191 INFO
org.apache.flink.streaming.connectors.kafka.internals.Kafka08Fetcher -
Starting periodic offset committer, with commit interval of 60000ms
2016-12-02 16:27:18,192 INFO
org.apache.flink.streaming.connectors.kafka.internals.Kafka08Fetcher -
Assigning 1 partitions to broker threads
2016-12-02 16:27:18,192 INFO
org.apache.flink.streaming.connectors.kafka.internals.Kafka08Fetcher -
Refreshing leader information for partitions [Partition: KafkaTopicPartition{to
pic='pview', partition=8}, KafkaPartitionHandle=[pview,8], offset=68844710010]
2016-12-02 16:27:18,216 INFO
org.apache.flink.streaming.connectors.kafka.FlinkKafkaConsumerBase - Trying to
get topic metadata from broker 10.10.10.203:9092 in try 0/3
2016-12-02 16:27:18,221 INFO
org.apache.flink.streaming.connectors.kafka.internals.Kafka08Fetcher -
Starting thread SimpleConsumer - Source: Custom Source -> Map - broker-3 (wx-ka
fka-08:9092)
2016-12-02 16:27:18,221 INFO
org.apache.flink.streaming.connectors.kafka.internals.SimpleConsumerThread -
Starting to fetch from [Partition: KafkaTopicPartition{topic='pview', par
tition=8}, KafkaPartitionHandle=[pview,8], offset=68844710010]
2016-12-02 16:27:48,472 ERROR org.apache.flink.runtime.taskmanager.Task
- Task execution failed.
org.apache.flink.runtime.io.network.netty.exception.LocalTransportException:
Connection timed out
at
org.apache.flink.runtime.io.network.netty.PartitionRequestClientHandler.exceptionCaught(PartitionRequestClientHandler.java:152)
at
io.netty.channel.AbstractChannelHandlerContext.invokeExceptionCaught(AbstractChannelHandlerContext.java:275)
at
io.netty.channel.AbstractChannelHandlerContext.fireExceptionCaught(AbstractChannelHandlerContext.java:253)
at
io.netty.channel.ChannelInboundHandlerAdapter.exceptionCaught(ChannelInboundHandlerAdapter.java:131)
at
io.netty.channel.AbstractChannelHandlerContext.invokeExceptionCaught(AbstractChannelHandlerContext.java:275)
at
io.netty.channel.AbstractChannelHandlerContext.fireExceptionCaught(AbstractChannelHandlerContext.java:253)
at
io.netty.channel.ChannelInboundHandlerAdapter.exceptionCaught(ChannelInboundHandlerAdapter.java:131)
...... ( as JobManager logs above)
> when yarn nodemanager lost, flink hung
> ---------------------------------------
>
> Key: FLINK-4632
> URL: https://issues.apache.org/jira/browse/FLINK-4632
> Project: Flink
> Issue Type: Bug
> Components: Distributed Coordination, Streaming
> Affects Versions: 1.2.0, 1.1.2
> Environment: cdh5.5.1 jdk1.7 flink1.1.2 1.2-snapshot kafka0.8.2
> Reporter: 刘喆
> Priority: Blocker
>
> When run flink streaming on yarn, using kafka as source, it runs well when
> start. But after long run, for example 8 hours, dealing 60,000,000+
> messages, it hung: no messages consumed, one taskmanager is CANCELING, the
> exception show:
> org.apache.flink.runtime.io.network.netty.exception.LocalTransportException:
> connection timeout
> at
> org.apache.flink.runtime.io.network.netty.PartitionRequestClientHandler.exceptionCaught(PartitionRequestClientHandler.java:152)
> at
> io.netty.channel.AbstractChannelHandlerContext.invokeExceptionCaught(AbstractChannelHandlerContext.java:275)
> at
> io.netty.channel.AbstractChannelHandlerContext.fireExceptionCaught(AbstractChannelHandlerContext.java:253)
> at
> io.netty.channel.ChannelInboundHandlerAdapter.exceptionCaught(ChannelInboundHandlerAdapter.java:131)
> at
> io.netty.channel.AbstractChannelHandlerContext.invokeExceptionCaught(AbstractChannelHandlerContext.java:275)
> at
> io.netty.channel.AbstractChannelHandlerContext.fireExceptionCaught(AbstractChannelHandlerContext.java:253)
> at
> io.netty.channel.ChannelInboundHandlerAdapter.exceptionCaught(ChannelInboundHandlerAdapter.java:131)
> at
> io.netty.channel.AbstractChannelHandlerContext.invokeExceptionCaught(AbstractChannelHandlerContext.java:275)
> at
> io.netty.channel.AbstractChannelHandlerContext.fireExceptionCaught(AbstractChannelHandlerContext.java:253)
> at
> io.netty.channel.ChannelHandlerAdapter.exceptionCaught(ChannelHandlerAdapter.java:79)
> at
> io.netty.channel.AbstractChannelHandlerContext.invokeExceptionCaught(AbstractChannelHandlerContext.java:275)
> at
> io.netty.channel.AbstractChannelHandlerContext.fireExceptionCaught(AbstractChannelHandlerContext.java:253)
> at
> io.netty.channel.DefaultChannelPipeline.fireExceptionCaught(DefaultChannelPipeline.java:835)
> at
> io.netty.channel.nio.AbstractNioByteChannel$NioByteUnsafe.handleReadException(AbstractNioByteChannel.java:87)
> at
> io.netty.channel.nio.AbstractNioByteChannel$NioByteUnsafe.read(AbstractNioByteChannel.java:162)
> at
> io.netty.channel.nio.NioEventLoop.processSelectedKey(NioEventLoop.java:511)
> at
> io.netty.channel.nio.NioEventLoop.processSelectedKeysOptimized(NioEventLoop.java:468)
> at
> io.netty.channel.nio.NioEventLoop.processSelectedKeys(NioEventLoop.java:382)
> at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:354)
> at
> io.netty.util.concurrent.SingleThreadEventExecutor$2.run(SingleThreadEventExecutor.java:111)
> at java.lang.Thread.run(Thread.java:745)
> Caused by: java.io.IOException: 连接超时
> at sun.nio.ch.FileDispatcherImpl.read0(Native Method)
> at sun.nio.ch.SocketDispatcher.read(SocketDispatcher.java:39)
> at sun.nio.ch.IOUtil.readIntoNativeBuffer(IOUtil.java:223)
> at sun.nio.ch.IOUtil.read(IOUtil.java:192)
> at sun.nio.ch.SocketChannelImpl.read(SocketChannelImpl.java:379)
> at
> io.netty.buffer.PooledUnsafeDirectByteBuf.setBytes(PooledUnsafeDirectByteBuf.java:311)
> at io.netty.buffer.AbstractByteBuf.writeBytes(AbstractByteBuf.java:881)
> at
> io.netty.channel.socket.nio.NioSocketChannel.doReadBytes(NioSocketChannel.java:241)
> at
> io.netty.channel.nio.AbstractNioByteChannel$NioByteUnsafe.read(AbstractNioByteChannel.java:119)
> ... 6 more
> after apply https://issues.apache.org/jira/browse/FLINK-4625
> it show:
> java.lang.Exception: TaskManager was lost/killed:
> ResourceID{resourceId='container_1471620986643_744852_01_001400'} @
> 38.slave.adh (dataPort=45349)
> at
> org.apache.flink.runtime.instance.SimpleSlot.releaseSlot(SimpleSlot.java:162)
> at
> org.apache.flink.runtime.instance.SlotSharingGroupAssignment.releaseSharedSlot(SlotSharingGroupAssignment.java:533)
> at
> org.apache.flink.runtime.instance.SharedSlot.releaseSlot(SharedSlot.java:138)
> at
> org.apache.flink.runtime.instance.Instance.markDead(Instance.java:167)
> at
> org.apache.flink.runtime.instance.InstanceManager.unregisterTaskManager(InstanceManager.java:224)
> at
> org.apache.flink.runtime.jobmanager.JobManager.org$apache$flink$runtime$jobmanager$JobManager$$handleTaskManagerTerminated(JobManager.scala:1054)
> at
> org.apache.flink.runtime.jobmanager.JobManager$$anonfun$handleMessage$1.applyOrElse(JobManager.scala:458)
> at
> scala.runtime.AbstractPartialFunction.apply(AbstractPartialFunction.scala:36)
> at
> org.apache.flink.runtime.clusterframework.ContaineredJobManager$$anonfun$handleContainerMessage$1.applyOrElse(ContaineredJobManager.scala:100)
> at scala.PartialFunction$OrElse.apply(PartialFunction.scala:167)
> at
> org.apache.flink.runtime.LeaderSessionMessageFilter$$anonfun$receive$1.applyOrElse(LeaderSessionMessageFilter.scala:36)
> at
> scala.runtime.AbstractPartialFunction.apply(AbstractPartialFunction.scala:36)
> at
> org.apache.flink.runtime.LogMessages$$anon$1.apply(LogMessages.scala:33)
> at
> org.apache.flink.runtime.LogMessages$$anon$1.apply(LogMessages.scala:28)
> at scala.PartialFunction$class.applyOrElse(PartialFunction.scala:123)
> at
> org.apache.flink.runtime.LogMessages$$anon$1.applyOrElse(LogMessages.scala:28)
> at akka.actor.Actor$class.aroundReceive(Actor.scala:465)
> at
> org.apache.flink.runtime.jobmanager.JobManager.aroundReceive(JobManager.scala:118)
> at akka.actor.ActorCell.receiveMessage(ActorCell.scala:516)
> at akka.actor.ActorCell.invoke(ActorCell.scala:487)
> at akka.dispatch.Mailbox.processMailbox(Mailbox.scala:254)
> at akka.dispatch.Mailbox.run(Mailbox.scala:221)
> at akka.dispatch.Mailbox.exec(Mailbox.scala:231)
> at scala.concurrent.forkjoin.ForkJoinTask.doExec(ForkJoinTask.java:260)
> at
> scala.concurrent.forkjoin.ForkJoinPool$WorkQueue.pollAndExecAll(ForkJoinPool.java:1253)
> at
> scala.concurrent.forkjoin.ForkJoinPool$WorkQueue.runTask(ForkJoinPool.java:1346)
> at
> scala.concurrent.forkjoin.ForkJoinPool.runWorker(ForkJoinPool.java:1979)
> at
> scala.concurrent.forkjoin.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:107)
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