Hi all,

I’m having some issues with Akka running on a modest cluster where increasing 
the parallelism results in disassociation messages.

I am running a batch job, Gelly’s TriangleListing (for simplicity) which is 
join-based. I have not seen this issue running AdamicAdar which is sort-based.

I have increased both of the following timeouts and the job takes less than 100 
seconds.
akka.ask.timeout: 1000 s
akka.lookup.timeout: 100 s

I have not changed taskmanager.exit-on-fatal-akka-error from the default value 
of false but the JobManager is dropping all TaskManager connections.

I can run the TriangleListing job with the same 127 TaskManagers with a smaller 
parallelism. Dropping from 2286 to around 1000 is often successful.

CPU and memory should not be a bottleneck for the JobManager (18 cores and 18 
GB).

I would be grateful for solutions, suggestions, or pointers to debugging this 
issue.

Thanks,
Greg


2017-07-14 16:50:08,119 INFO  
org.apache.flink.runtime.executiongraph.ExecutionGraph        - GroupReduce 
(Generate triplets) (30/2286) (5a2e8f0a00530bd2216d7d3ee10688f7) switched from 
RUNNING to FINISHED.
2017-07-14 16:50:08,312 INFO  
org.apache.flink.runtime.executiongraph.ExecutionGraph        - GroupReduce 
(Generate triplets) (26/2286) (c6a91db2d6b6797768596d9f746d316f) switched from 
RUNNING to FINISHED.
2017-07-14 16:50:09,831 INFO  
org.apache.flink.runtime.executiongraph.ExecutionGraph        - GroupReduce 
(Generate triplets) (131/2286) (2c77b1e4b90b951d3be1e09bf4cf41d2) switched from 
RUNNING to FINISHED.
2017-07-14 16:50:10,057 INFO  
org.apache.flink.runtime.executiongraph.ExecutionGraph        - GroupReduce 
(Generate triplets) (133/2286) (d0c4c4eda4f0c44fe594a1b94eb66c93) switched from 
RUNNING to FINISHED.
2017-07-14 16:50:11,861 INFO  
org.apache.flink.runtime.executiongraph.ExecutionGraph        - GroupReduce 
(Generate triplets) (70/2286) (69ce8d91fbbad943c277ee92d3c38aaa) switched from 
RUNNING to FINISHED.
2017-07-14 16:50:15,029 INFO  
org.apache.flink.runtime.executiongraph.ExecutionGraph        - GroupReduce 
(Generate triplets) (38/2286) (a72c2dee009342bc4d90ec98427fa717) switched from 
RUNNING to FINISHED.
2017-07-14 16:50:16,583 INFO  
org.apache.flink.runtime.executiongraph.ExecutionGraph        - GroupReduce 
(Generate triplets) (27/2286) (e79ec6229d4afdc6669c1c221a19ad8c) switched from 
RUNNING to FINISHED.
2017-07-14 16:50:19,498 INFO  
org.apache.flink.runtime.executiongraph.ExecutionGraph        - GroupReduce 
(Generate triplets) (44/2286) (53e35ddbd0e02d256620e5310276bea6) switched from 
RUNNING to FINISHED.
2017-07-14 16:50:21,021 WARN  akka.remote.ReliableDeliverySupervisor            
            - Association with remote system 
[akka.tcp://flink@ip-10-0-28-115:40713] has failed, address is now gated for 
[5000] ms. Reason: [Disassociated]
2017-07-14 16:50:21,097 WARN  akka.remote.ReliableDeliverySupervisor            
            - Association with remote system 
[akka.tcp://flink@ip-10-0-21-141:45899] has failed, address is now gated for 
[5000] ms. Reason: [Disassociated]
2017-07-14 16:50:21,129 WARN  akka.remote.ReliableDeliverySupervisor            
            - Association with remote system 
[akka.tcp://flink@ip-10-0-27-236:37471] has failed, address is now gated for 
[5000] ms. Reason: [Disassociated]
2017-07-14 16:50:21,132 WARN  akka.remote.ReliableDeliverySupervisor            
            - Association with remote system 
[akka.tcp://flink@ip-10-0-18-79:45765] has failed, address is now gated for 
[5000] ms. Reason: [Disassociated]
2017-07-14 16:50:21,140 WARN  akka.remote.ReliableDeliverySupervisor            
            - Association with remote system 
[akka.tcp://flink@ip-10-0-29-112:41017] has failed, address is now gated for 
[5000] ms. Reason: [Disassociated]
2017-07-14 16:50:21,142 WARN  akka.remote.ReliableDeliverySupervisor            
            - Association with remote system 
[akka.tcp://flink@ip-10-0-25-70:39625] has failed, address is now gated for 
[5000] ms. Reason: [Disassociated]
2017-07-14 16:50:21,159 WARN  akka.remote.ReliableDeliverySupervisor            
            - Association with remote system 
[akka.tcp://flink@ip-10-0-28-105:39127] has failed, address is now gated for 
[5000] ms. Reason: [Disassociated]
2017-07-14 16:50:21,170 WARN  akka.remote.ReliableDeliverySupervisor            
            - Association with remote system 
[akka.tcp://flink@ip-10-0-28-117:38923] has failed, address is now gated for 
[5000] ms. Reason: [Disassociated]
2017-07-14 16:50:21,181 WARN  akka.remote.ReliableDeliverySupervisor            
            - Association with remote system 
[akka.tcp://flink@ip-10-0-20-172:40007] has failed, address is now gated for 
[5000] ms. Reason: [Disassociated]
2017-07-14 16:50:21,190 WARN  akka.remote.ReliableDeliverySupervisor            
            - Association with remote system 
[akka.tcp://flink@ip-10-0-22-220:44391] has failed, address is now gated for 
[5000] ms. Reason: [Disassociated]
2017-07-14 16:50:21,215 WARN  akka.remote.ReliableDeliverySupervisor            
            - Association with remote system 
[akka.tcp://flink@ip-10-0-25-130:34963] has failed, address is now gated for 
[5000] ms. Reason: [Disassociated]
2017-07-14 16:50:21,219 WARN  akka.remote.ReliableDeliverySupervisor            
            - Association with remote system 
[akka.tcp://flink@ip-10-0-18-125:38015] has failed, address is now gated for 
[5000] ms. Reason: [Disassociated]
2017-07-14 16:50:21,227 WARN  akka.remote.ReliableDeliverySupervisor            
            - Association with remote system 
[akka.tcp://flink@ip-10-0-17-222:42125] has failed, address is now gated for 
[5000] ms. Reason: [Disassociated]
2017-07-14 16:50:21,228 WARN  akka.remote.ReliableDeliverySupervisor            
            - Association with remote system 
[akka.tcp://flink@ip-10-0-25-92:38905] has failed, address is now gated for 
[5000] ms. Reason: [Disassociated]
2017-07-14 16:50:21,229 WARN  akka.remote.ReliableDeliverySupervisor            
            - Association with remote system 
[akka.tcp://flink@ip-10-0-21-198:35983] has failed, address is now gated for 
[5000] ms. Reason: [Disassociated]
2017-07-14 16:50:21,233 WARN  akka.remote.ReliableDeliverySupervisor            
            - Association with remote system 
[akka.tcp://flink@ip-10-0-18-217:41155] has failed, address is now gated for 
[5000] ms. Reason: [Disassociated]
2017-07-14 16:50:21,238 WARN  akka.remote.ReliableDeliverySupervisor            
            - Association with remote system 
[akka.tcp://flink@ip-10-0-30-198:35671] has failed, address is now gated for 
[5000] ms. Reason: [Disassociated]
2017-07-14 16:50:21,238 WARN  akka.remote.ReliableDeliverySupervisor            
            - Association with remote system 
[akka.tcp://flink@ip-10-0-27-213:44085] has failed, address is now gated for 
[5000] ms. Reason: [Disassociated]
2017-07-14 16:50:21,245 WARN  akka.remote.ReliableDeliverySupervisor            
            - Association with remote system 
[akka.tcp://flink@ip-10-0-17-64:42935] has failed, address is now gated for 
[5000] ms. Reason: [Disassociated]
2017-07-14 16:50:21,268 WARN  akka.remote.ReliableDeliverySupervisor            
            - Association with remote system 
[akka.tcp://flink@ip-10-0-28-99:37419] has failed, address is now gated for 
[5000] ms. Reason: [Disassociated]
2017-07-14 16:50:21,287 WARN  akka.remote.ReliableDeliverySupervisor            
            - Association with remote system 
[akka.tcp://flink@ip-10-0-31-97:36659] has failed, address is now gated for 
[5000] ms. Reason: [Disassociated]
2017-07-14 16:50:21,288 WARN  akka.remote.ReliableDeliverySupervisor            
            - Association with remote system 
[akka.tcp://flink@ip-10-0-24-180:36329] has failed, address is now gated for 
[5000] ms. Reason: [Disassociated]
2017-07-14 16:50:21,290 WARN  akka.remote.ReliableDeliverySupervisor            
            - Association with remote system 
[akka.tcp://flink@ip-10-0-16-158:44247] has failed, address is now gated for 
[5000] ms. Reason: [Disassociated]
2017-07-14 16:50:21,293 INFO  
org.apache.flink.runtime.executiongraph.ExecutionGraph        - Join (Triangle 
listing) (990/2286) (a2df3b72293f636bb4434f4e2fe342d7) switched from RUNNING to 
FAILED.
org.apache.flink.runtime.io.network.netty.exception.RemoteTransportException: 
Error at remote task manager 'ip-10-0-25-70/10.0.25.70:43941'.
        at 
org.apache.flink.runtime.io.network.netty.PartitionRequestClientHandler.decodeMsg(PartitionRequestClientHandler.java:253)
        at 
org.apache.flink.runtime.io.network.netty.PartitionRequestClientHandler.channelRead(PartitionRequestClientHandler.java:160)
        at 
io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:339)
        at 
io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:324)
        at 
io.netty.handler.codec.MessageToMessageDecoder.channelRead(MessageToMessageDecoder.java:103)
        at 
io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:339)
        at 
io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:324)
        at 
io.netty.handler.codec.ByteToMessageDecoder.channelRead(ByteToMessageDecoder.java:242)
        at 
io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:339)
        at 
io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:324)
        at 
io.netty.channel.DefaultChannelPipeline.fireChannelRead(DefaultChannelPipeline.java:847)
        at 
io.netty.channel.nio.AbstractNioByteChannel$NioByteUnsafe.read(AbstractNioByteChannel.java:131)
        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: 
org.apache.flink.runtime.io.network.partition.ProducerFailedException: 
java.lang.Exception: TaskManager akka://flink/user/taskmanager disconnects from 
JobManager akka.tcp://flink@10.0.25.151:6123/user/jobmanager: JobManager is no 
longer reachable
        at 
org.apache.flink.runtime.io.network.netty.PartitionRequestQueue.writeAndFlushNextMessageIfPossible(PartitionRequestQueue.java:170)
        at 
org.apache.flink.runtime.io.network.netty.PartitionRequestQueue.userEventTriggered(PartitionRequestQueue.java:111)
        at 
io.netty.channel.AbstractChannelHandlerContext.invokeUserEventTriggered(AbstractChannelHandlerContext.java:308)
        at 
io.netty.channel.AbstractChannelHandlerContext.fireUserEventTriggered(AbstractChannelHandlerContext.java:294)
        at 
io.netty.channel.ChannelInboundHandlerAdapter.userEventTriggered(ChannelInboundHandlerAdapter.java:108)
        at 
io.netty.channel.AbstractChannelHandlerContext.invokeUserEventTriggered(AbstractChannelHandlerContext.java:308)
        at 
io.netty.channel.AbstractChannelHandlerContext.fireUserEventTriggered(AbstractChannelHandlerContext.java:294)
        at 
io.netty.channel.ChannelInboundHandlerAdapter.userEventTriggered(ChannelInboundHandlerAdapter.java:108)
        at 
io.netty.channel.AbstractChannelHandlerContext.invokeUserEventTriggered(AbstractChannelHandlerContext.java:308)
        at 
io.netty.channel.AbstractChannelHandlerContext.fireUserEventTriggered(AbstractChannelHandlerContext.java:294)
        at 
io.netty.channel.ChannelInboundHandlerAdapter.userEventTriggered(ChannelInboundHandlerAdapter.java:108)
        at 
io.netty.channel.AbstractChannelHandlerContext.invokeUserEventTriggered(AbstractChannelHandlerContext.java:308)
        at 
io.netty.channel.AbstractChannelHandlerContext.fireUserEventTriggered(AbstractChannelHandlerContext.java:294)
        at 
io.netty.channel.DefaultChannelPipeline.fireUserEventTriggered(DefaultChannelPipeline.java:841)
        at 
org.apache.flink.runtime.io.network.netty.PartitionRequestQueue$1.run(PartitionRequestQueue.java:84)
        at 
io.netty.util.concurrent.SingleThreadEventExecutor.runAllTasks(SingleThreadEventExecutor.java:357)
        at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:357)
        ... 2 more
Caused by: java.lang.Exception: TaskManager akka://flink/user/taskmanager 
disconnects from JobManager akka.tcp://flink@10.0.25.151:6123/user/jobmanager: 
JobManager is no longer reachable
        at 
org.apache.flink.runtime.taskmanager.TaskManager.handleJobManagerDisconnect(TaskManager.scala:1096)
        at 
org.apache.flink.runtime.taskmanager.TaskManager$$anonfun$handleMessage$1.applyOrElse(TaskManager.scala:312)
        at 
scala.runtime.AbstractPartialFunction.apply(AbstractPartialFunction.scala:36)
        at 
org.apache.flink.runtime.LeaderSessionMessageFilter$$anonfun$receive$1.applyOrElse(LeaderSessionMessageFilter.scala:49)
        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:467)
        at 
org.apache.flink.runtime.taskmanager.TaskManager.aroundReceive(TaskManager.scala:121)
        at akka.actor.ActorCell.receiveMessage(ActorCell.scala:516)
        at 
akka.actor.dungeon.DeathWatch$class.receivedTerminated(DeathWatch.scala:44)
        at akka.actor.ActorCell.receivedTerminated(ActorCell.scala:369)
        at akka.actor.ActorCell.autoReceiveMessage(ActorCell.scala:501)
        at akka.actor.ActorCell.invoke(ActorCell.scala:486)
        at akka.dispatch.Mailbox.processMailbox(Mailbox.scala:238)
        at akka.dispatch.Mailbox.run(Mailbox.scala:220)
        at 
akka.dispatch.ForkJoinExecutorConfigurator$AkkaForkJoinTask.exec(AbstractDispatcher.scala:397)
        at scala.concurrent.forkjoin.ForkJoinTask.doExec(ForkJoinTask.java:260)
        at 
scala.concurrent.forkjoin.ForkJoinPool$WorkQueue.runTask(ForkJoinPool.java:1339)
        at 
scala.concurrent.forkjoin.ForkJoinPool.runWorker(ForkJoinPool.java:1979)
        at 
scala.concurrent.forkjoin.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:107)
2017-07-14 16:50:21,293 INFO  
org.apache.flink.runtime.executiongraph.ExecutionGraph        - Join (Triangle 
listing) (11/2286) (cc78687ccb6581e191c7f9ca24f7ab38) switched from RUNNING to 
FAILED.
org.apache.flink.runtime.io.network.netty.exception.RemoteTransportException: 
Error at remote task manager 'ip-10-0-25-70/10.0.25.70:43941'.
        at 
org.apache.flink.runtime.io.network.netty.PartitionRequestClientHandler.decodeMsg(PartitionRequestClientHandler.java:253)
        at 
org.apache.flink.runtime.io.network.netty.PartitionRequestClientHandler.channelRead(PartitionRequestClientHandler.java:160)
        at 
io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:339)
        at 
io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:324)
        at 
io.netty.handler.codec.MessageToMessageDecoder.channelRead(MessageToMessageDecoder.java:103)
        at 
io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:339)
        at 
io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:324)
        at 
io.netty.handler.codec.ByteToMessageDecoder.channelRead(ByteToMessageDecoder.java:242)
        at 
io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:339)
        at 
io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:324)
        at 
io.netty.channel.DefaultChannelPipeline.fireChannelRead(DefaultChannelPipeline.java:847)
        at 
io.netty.channel.nio.AbstractNioByteChannel$NioByteUnsafe.read(AbstractNioByteChannel.java:131)
        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: 
org.apache.flink.runtime.io.network.partition.ProducerFailedException: 
java.lang.Exception: TaskManager akka://flink/user/taskmanager disconnects from 
JobManager akka.tcp://flink@10.0.25.151:6123/user/jobmanager: JobManager is no 
longer reachable
        at 
org.apache.flink.runtime.io.network.netty.PartitionRequestQueue.writeAndFlushNextMessageIfPossible(PartitionRequestQueue.java:170)
        at 
org.apache.flink.runtime.io.network.netty.PartitionRequestQueue.userEventTriggered(PartitionRequestQueue.java:111)
        at 
io.netty.channel.AbstractChannelHandlerContext.invokeUserEventTriggered(AbstractChannelHandlerContext.java:308)
        at 
io.netty.channel.AbstractChannelHandlerContext.fireUserEventTriggered(AbstractChannelHandlerContext.java:294)
        at 
io.netty.channel.ChannelInboundHandlerAdapter.userEventTriggered(ChannelInboundHandlerAdapter.java:108)
        at 
io.netty.channel.AbstractChannelHandlerContext.invokeUserEventTriggered(AbstractChannelHandlerContext.java:308)
        at 
io.netty.channel.AbstractChannelHandlerContext.fireUserEventTriggered(AbstractChannelHandlerContext.java:294)
        at 
io.netty.channel.ChannelInboundHandlerAdapter.userEventTriggered(ChannelInboundHandlerAdapter.java:108)
        at 
io.netty.channel.AbstractChannelHandlerContext.invokeUserEventTriggered(AbstractChannelHandlerContext.java:308)
        at 
io.netty.channel.AbstractChannelHandlerContext.fireUserEventTriggered(AbstractChannelHandlerContext.java:294)
        at 
io.netty.channel.ChannelInboundHandlerAdapter.userEventTriggered(ChannelInboundHandlerAdapter.java:108)
        at 
io.netty.channel.AbstractChannelHandlerContext.invokeUserEventTriggered(AbstractChannelHandlerContext.java:308)
        at 
io.netty.channel.AbstractChannelHandlerContext.fireUserEventTriggered(AbstractChannelHandlerContext.java:294)
        at 
io.netty.channel.DefaultChannelPipeline.fireUserEventTriggered(DefaultChannelPipeline.java:841)
        at 
org.apache.flink.runtime.io.network.netty.PartitionRequestQueue$1.run(PartitionRequestQueue.java:84)
        at 
io.netty.util.concurrent.SingleThreadEventExecutor.runAllTasks(SingleThreadEventExecutor.java:357)
        at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:357)
        ... 2 more
Caused by: java.lang.Exception: TaskManager akka://flink/user/taskmanager 
disconnects from JobManager akka.tcp://flink@10.0.25.151:6123/user/jobmanager: 
JobManager is no longer reachable
        at 
org.apache.flink.runtime.taskmanager.TaskManager.handleJobManagerDisconnect(TaskManager.scala:1096)
        at 
org.apache.flink.runtime.taskmanager.TaskManager$$anonfun$handleMessage$1.applyOrElse(TaskManager.scala:312)
        at 
scala.runtime.AbstractPartialFunction.apply(AbstractPartialFunction.scala:36)
        at 
org.apache.flink.runtime.LeaderSessionMessageFilter$$anonfun$receive$1.applyOrElse(LeaderSessionMessageFilter.scala:49)
        at 
scala.runtime.AbstractPartialFunction.apply(AbstractPartialFunction.scala:36)
        at 
org.apache.flink.runtime.LogMessages$$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:467)
        at 
org.apache.flink.runtime.taskmanager.TaskManager.aroundReceive(TaskManager.scala:121)
        at akka.actor.ActorCell.receiveMessage(ActorCell.scala:516)
        at 
akka.actor.dungeon.DeathWatch$class.receivedTerminated(DeathWatch.scala:44)
        at akka.actor.ActorCell.receivedTerminated(ActorCell.scala:369)
        at akka.actor.ActorCell.autoReceiveMessage(ActorCell.scala:501)
        at akka.actor.ActorCell.invoke(ActorCell.scala:486)
        at akka.dispatch.Mailbox.processMailbox(Mailbox.scala:238)
        at akka.dispatch.Mailbox.run(Mailbox.scala:220)
        at 
akka.dispatch.ForkJoinExecutorConfigurator$AkkaForkJoinTask.exec(AbstractDispatcher.scala:397)
        at scala.concurrent.forkjoin.ForkJoinTask.doExec(ForkJoinTask.java:260)
        at 
scala.concurrent.forkjoin.ForkJoinPool$WorkQueue.runTask(ForkJoinPool.java:1339)
        at 
scala.concurrent.forkjoin.ForkJoinPool.runWorker(ForkJoinPool.java:1979)
        at 
scala.concurrent.forkjoin.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:107)

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