Unfortunately, we’re only seeing the initial connection refused exception that 
I posted. So, if the issue is related to the buffer server as suggested below, 
is that something we can mitigate? Do we need to allocate more memory to the 
buffer servers?

“The exception is raised due to the buffer server termination in one of the 
operators containers and I guess that it happens when app master tries to purge 
data from the buffer server.”

From: Ashwin Chandra Putta <ashwinchand...@gmail.com>
Reply-To: "users@apex.apache.org" <users@apex.apache.org>
Date: Wednesday, November 30, 2016 at 12:07 PM
To: "users@apex.apache.org" <users@apex.apache.org>
Subject: Re: Connection refused exception

Can you check in stram events on the gateway UI, you can select a time range to 
begin at the start of the application so you can see the series of events that 
happened in a timeline. Then you will find the first error in that list. You 
can find stram events in the logical tab to the right for the application in 
monitor page.

Regards,
Ashwin.

On Wed, Nov 30, 2016 at 8:20 AM, Vlad Rozov 
<v.ro...@datatorrent.com<mailto:v.ro...@datatorrent.com>> wrote:
Hmm, that is strange. I would expect an ERROR in the KafkaInputOperator around 
21:01. Please check the earliest killed container log.

2016-11-24 21:01:01,839 [IPC Server handler 4 on 44453] ERROR 
stram.StreamingContainerManager processOperatorFailure - Initiating container 
restart after operator failure PTOperator[id=1,name=kafkaInputOperator]

Thank you,

Vlad

On 11/30/16 07:17, Feldkamp, Brandon (CONT) wrote:
This is the only other stacktrace I could find but it’s dated after the initial 
cause of failure.

2016-11-24 21:52:24,681 [14/kafkaInputOperator:KafkaInputOperator] ERROR 
engine.StreamingContainer run - Operator set 
[OperatorDeployInfo[id=14,name=kafkaInputOperator,type=INPUT,checkpoint={583786630000239f,
 0, 
0},inputs=[],outputs=[OperatorDeployInfo.OutputDeployInfo[portName=outputPort,streamId=KafkaInput
 -> AuthParser,bufferServer=ip-200-120-36]]]] stopped running due to an 
exception.
java.lang.RuntimeException: replay
        at 
com.datatorrent.contrib.kafka.AbstractKafkaInputOperator.replay(AbstractKafkaInputOperator.java:330)
        at 
com.datatorrent.contrib.kafka.AbstractKafkaInputOperator.beginWindow(AbstractKafkaInputOperator.java:266)
        at com.datatorrent.stram.engine.InputNode.run(InputNode.java:122)
        at 
com.datatorrent.stram.engine.StreamingContainer$2.run(StreamingContainer.java:1407)
Caused by: java.io.EOFException: Received -1 when reading from channel, socket 
has likely been closed.
        at kafka.utils.Utils$.read(Utils.scala:376)
        at 
kafka.network.BoundedByteBufferReceive.readFrom(BoundedByteBufferReceive.scala:54)
        at kafka.network.Receive$class.readCompletely(Transmission.scala:56)
        at 
kafka.network.BoundedByteBufferReceive.readCompletely(BoundedByteBufferReceive.scala:29)
        at kafka.network.BlockingChannel.receive(BlockingChannel.scala:100)
        at kafka.consumer.SimpleConsumer.liftedTree1$1(SimpleConsumer.scala:81)
        at 
kafka.consumer.SimpleConsumer.kafka$consumer$SimpleConsumer$$sendRequest(SimpleConsumer.scala:71)
        at 
kafka.consumer.SimpleConsumer$$anonfun$fetch$1$$anonfun$apply$mcV$sp$1.apply$mcV$sp(SimpleConsumer.scala:109)
        at 
kafka.consumer.SimpleConsumer$$anonfun$fetch$1$$anonfun$apply$mcV$sp$1.apply(SimpleConsumer.scala:109)
        at 
kafka.consumer.SimpleConsumer$$anonfun$fetch$1$$anonfun$apply$mcV$sp$1.apply(SimpleConsumer.scala:109)
        at kafka.metrics.KafkaTimer.time(KafkaTimer.scala:33)
        at 
kafka.consumer.SimpleConsumer$$anonfun$fetch$1.apply$mcV$sp(SimpleConsumer.scala:108)
        at 
kafka.consumer.SimpleConsumer$$anonfun$fetch$1.apply(SimpleConsumer.scala:108)
        at 
kafka.consumer.SimpleConsumer$$anonfun$fetch$1.apply(SimpleConsumer.scala:108)
        at kafka.metrics.KafkaTimer.time(KafkaTimer.scala:33)
        at kafka.consumer.SimpleConsumer.fetch(SimpleConsumer.scala:107)
        at kafka.javaapi.consumer.SimpleConsumer.fetch(SimpleConsumer.scala:47)
        at 
com.datatorrent.contrib.kafka.AbstractKafkaInputOperator.replay(AbstractKafkaInputOperator.java:304)
        ... 3 more
2016-11-24 21:52:24,690 [14/kafkaInputOperator:KafkaInputOperator] ERROR 
engine.StreamingContainer run - Shutdown of operator 
OperatorDeployInfo[id=14,name=kafkaInputOperator,type=INPUT,checkpoint={583786630000239f,
 0, 
0},inputs=[],outputs=[OperatorDeployInfo.OutputDeployInfo[portName=outputPort,streamId=KafkaInput
 -> AuthParser,bufferServer=ip-200-120-36]]] failed due to an exception.
java.lang.NullPointerException
        at 
com.datatorrent.contrib.kafka.SimpleKafkaConsumer.close(SimpleKafkaConsumer.java:348)
        at org.apache.commons.io.IOUtils.closeQuietly(IOUtils.java:303)
        at 
com.datatorrent.contrib.kafka.KafkaConsumer.stop(KafkaConsumer.java:157)
        at 
com.datatorrent.contrib.kafka.AbstractKafkaInputOperator.deactivate(AbstractKafkaInputOperator.java:405)
        at com.datatorrent.stram.engine.Node.deactivate(Node.java:646)
        at 
com.datatorrent.stram.engine.StreamingContainer.teardownNode(StreamingContainer.java:1347)
        at 
com.datatorrent.stram.engine.StreamingContainer.access$500(StreamingContainer.java:130)
        at 
com.datatorrent.stram.engine.StreamingContainer$2.run(StreamingContainer.java:1438)


From: Vlad Rozov <v.ro...@datatorrent.com><mailto:v.ro...@datatorrent.com>
Organization: DataTorrent
Reply-To: "users@apex.apache.org"<mailto:users@apex.apache.org> 
<users@apex.apache.org><mailto:users@apex.apache.org>
Date: Tuesday, November 29, 2016 at 10:21 PM
To: "users@apex.apache.org"<mailto:users@apex.apache.org> 
<users@apex.apache.org><mailto:users@apex.apache.org>
Subject: Re: Connection refused exception

Brandon,

Is the stacktrace from the app master log or is it from a local mode run? The 
exception is raised due to the buffer server termination in one of the 
operators containers and I guess that it happens when app master tries to purge 
data from the buffer server. Check the operators containers logs for 
exceptions/errors unless the application was started in the local mode. In the 
later case, try to enable DEBUG level.

Thank you,

Vlad
On 11/29/16 05:54, Feldkamp, Brandon (CONT) wrote:
Hello,

I’m wondering if anyone has seen a similar stack trace before as there isn’t a 
lot of info provided. I’m wondering if the connection refused is from one 
operator to another or the kafkaInputOperator being unable to connect to kafka.

Any ideas? Here’s the stacktrace:

2016-11-24 21:00:51,998 [ProcessWideEventLoop] ERROR netlet.AbstractClient 
handleException - Exception in event loop {id=ProcessWideEventLoop, head=7418, 
tail=7416, capacity=1024}
java.net.ConnectException: Connection refused
                at sun.nio.ch.SocketChannelImpl.checkConnect(Native Method)
                at 
sun.nio.ch.SocketChannelImpl.finishConnect(SocketChannelImpl.java:717)
                at 
com.datatorrent.netlet.DefaultEventLoop.handleSelectedKey(DefaultEventLoop.java:371)
                at 
com.datatorrent.netlet.OptimizedEventLoop$SelectedSelectionKeySet.forEach(OptimizedEventLoop.java:59)
                at 
com.datatorrent.netlet.OptimizedEventLoop.runEventLoop(OptimizedEventLoop.java:192)
                at 
com.datatorrent.netlet.OptimizedEventLoop.runEventLoop(OptimizedEventLoop.java:157)
                at 
com.datatorrent.netlet.DefaultEventLoop.run(DefaultEventLoop.java:156)
                at java.lang.Thread.run(Thread.java:745)
2016-11-24 21:01:01,839 [IPC Server handler 4 on 44453] ERROR 
stram.StreamingContainerManager processOperatorFailure - Initiating container 
restart after operator failure PTOperator[id=1,name=kafkaInputOperator]
2016-11-24 21:01:01,898 [IPC Server handler 29 on 44453] ERROR 
stram.StreamingContainerManager processOperatorFailure - Initiating container 
restart after operator failure PTOperator[id=7,name=kafkaInputOperator]
2016-11-24 21:01:32,991 [IPC Server handler 24 on 44453] ERROR 
stram.StreamingContainerManager processOperatorFailure - Initiating container 
restart after operator failure PTOperator[id=13,name=kafkaInputOperator]
2016-11-24 21:01:44,189 [IPC Server handler 22 on 44453] ERROR 
stram.StreamingContainerManager processOperatorFailure - Initiating container 
restart after operator failure PTOperator[id=10,name=kafkaInputOperator]
2016-11-24 21:01:44,604 [IPC Server handler 5 on 44453] ERROR 
stram.StreamingContainerManager processOperatorFailure - Initiating container 
restart after operator failure PTOperator[id=3,name=kafkaInputOperator]
2016-11-24 21:01:44,744 [IPC Server handler 16 on 44453] ERROR 
stram.StreamingContainerManager processOperatorFailure - Initiating container 
restart after operator failure PTOperator[id=12,name=kafkaInputOperator]
Thanks!
Brandon

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________________________________

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intended only for use by the individual or entity to which it is addressed. If 
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--

Regards,
Ashwin.
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