Is the exception reproducible? If yes, can you provide full app master log with the debug level enabled.

Thank you,

Vlad

On 12/1/16 05:29, Feldkamp, Brandon (CONT) wrote:

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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--

Regards,

Ashwin.


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