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From Patrick Lucas <patr...@data-artisans.com>
Subject Re: Docker and AWS taskmanager configuration
Date Tue, 21 Nov 2017 14:14:13 GMT
Hi Colin,

Is each instance's "unique-dns-address" equal to the hostname of the
instance or is the hostname something else? If it's different from the
hostname, you're correct in assuming you need to configure each node to
advertise its unique-dns-address intead.

Are the unique-dns-addresses aliases for public or private IPs? I.e. in
your example of a unique-dns-address do the X's map to the private IP of
the instance or some public IP? If I recall correctly, in AWS (at least
within a VPC), instance's public IPs are not actually bound to the instance
itself and are more like a NAT/DMZ address, meaning you can't actually bind
a port to them. This might work differently in EC2-Classic.

If you ensure that each node advertises a bindable, resolvable name or IP
address—with jobmanager.rpc.address on the jobmanager and
taskmanager.hostname on the taskmanager—then they should all be able to
discover, address, and communicate with each other with no problems.

--
Patrick Lucas

On Tue, Nov 21, 2017 at 6:44 AM, Colin Williams <
colin.williams.seattle@gmail.com> wrote:

> Hi,
>
> We noticed that we couldn't parallelize our flink docker containers and
> this looks like an issue that other have experienced. In our environment we
> were not setting any hostname in the flink configuration. This worked for
> the single node, but it looks like the taskmanagers would have the
> exception also similar to others:
>
> org.apache.flink.runtime.io.network.partition.PartitionNotFoundException: Partition 2ec10eeac8969a16945b3713b63c0f4f@11052a989c7921423e44653285481e23
not found.
>> 	at org.apache.flink.runtime.io.network.partition.consumer.RemoteInputChannel.failPartitionRequest(RemoteInputChannel.java:203)
>> 	at org.apache.flink.runtime.io.network.partition.consumer.RemoteInputChannel.retriggerSubpartitionRequest(RemoteInputChannel.java:128)
>> 	at org.apache.flink.runtime.io.network.partition.consumer.SingleInputGate.retriggerPartitionRequest(SingleInputGate.java:345)
>> 	at org.apache.flink.runtime.taskmanager.Task.onPartitionStateUpdate(Task.java:1286)
>> 	at org.apache.flink.runtime.taskmanager.Task$2.apply(Task.java:1123)
>> 	at org.apache.flink.runtime.taskmanager.Task$2.apply(Task.java:1118)
>> 	at org.apache.flink.runtime.concurrent.impl.FlinkFuture$5.onComplete(FlinkFuture.java:272)
>> 	at akka.dispatch.OnComplete.internal(Future.scala:248)
>> 	at akka.dispatch.OnComplete.internal(Future.scala:245)
>> 	at akka.dispatch.japi$CallbackBridge.apply(Future.scala:175)
>> 	at akka.dispatch.japi$CallbackBridge.apply(Future.scala:172)
>> 	at scala.concurrent.impl.CallbackRunnable.run(Promise.scala:32)
>> 	at akka.dispatch.BatchingExecutor$AbstractBatch.processBatch(BatchingExecutor.scala:55)
>> 	at akka.dispatch.BatchingExecutor$BlockableBatch$$anonfun$run$1.apply$mcV$sp(BatchingExecutor.scala:91)
>> 	at akka.dispatch.BatchingExecutor$BlockableBatch$$anonfun$run$1.apply(BatchingExecutor.scala:91)
>> 	at akka.dispatch.BatchingExecutor$BlockableBatch$$anonfun$run$1.apply(BatchingExecutor.scala:91)
>> 	at scala.concurrent.BlockContext$.withBlockContext(BlockContext.scala:72)
>> 	at akka.dispatch.BatchingExecutor$BlockableBatch.run(BatchingExecutor.scala:90)
>> 	at akka.dispatch.TaskInvocation.run(AbstractDispatcher.scala:40)
>> 	at akka.dispatch.ForkJoinExecutorConfigurator$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)
>>
>>
> In our AWS environment we are only running one container per EC2 instance,
> and each instance has a "unique-dns-address" associated with it.
> uniquie-dns-address is similar to ip-XXX-XX-XX-XXX.aws-region-X .
>
> Then so that we don't have to do any additional DNS configuration, it
> would be convenient to exploit this dns address for each taskmanager to
> talk to each other.
>
> I tested that I could reach each taskmanager from the unique-dns-address
> via telnet to one of the taskmanager ports and I was able to connect. This
> made me think that setting taskmanager.hostname to the address would solve
> my issue.
>
> However when I tried to set taskmanager.hostname :
> unique-dns-address in flink-conf.yaml I ended up with a java.net.BindException:
> Cannot assign requested address.I'm not entirely sure why this happened.
>
> But I looked around and found some other list message that mentioned
> https://doc.akka.io/docs/akka/2.4.1/additional/faq.html / RE: remote
> actor.
>
> So I set *akka.remote.netty.tcp.hostname*: unique-dns-address again for
> each instance. However I was not certain which taskmanager port to set for akka.remote.netty.tcp.port
> . Then I left it unset but tried again I had the same
> PartitionNotFoundException
>
> I realize this is a complicated issue which varies for each environment.
> But I am asking for advice regarding other things I should try to tackle
> the issue.
>
> Furhtermore, if I'm on the right track, what taskmanager service port
> should correspond to akka.remote.netty.tcp.port ?
>
>
>
>

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