EMA ChannelSet failover

david.gardiner
david.gardiner Newcomer
in EMA

Hi

I'm testing NiProvider failover using the <ChannelSet value="Channel_1,Channel_2"/> option.

I've intentionally set Channel_1 to an invalid host to force it to failover immediately when I start my application. This appears to work fine and I get a "Login accepted by host message" from Channel_2. However when I attempt to start publishing data it throws the following exception.

Jan 10, 2018 1:08:41 PM com.thomsonreuters.ema.access.OmmNiProviderImpl submit
SEVERE: loggerMsg
ClientName: NiProvider_1_1
Severity: Error
Text: Internal error: rsslChannel.submit() failed in OmmNiProviderImpl.submit(RefreshMsg)RsslChannel 0
Error Id -1
Internal sysError 0
Error Location Reactor.submitChannel
Error Text ReactorChannel is closed, aborting.
loggerMsgEnd

Channel_2 works fine if I connect directly to it ie if I use <ChannelSet value="Channel_2"/> so I assume there is an issue with the failover mechanism.

anyone having this issue as well ?

thanks

I can see it may be linked to when I request the dictionary from Channel_2 after I receive the login message.

java.lang.NullPointerException
at com.thomsonreuters.ema.access.NiProviderDictionaryItem.rsslSubmit(DictionaryCallbackClient.java:1920)
at com.thomsonreuters.ema.access.NiProviderDictionaryItem.open(DictionaryCallbackClient.java:1777)
at com.thomsonreuters.ema.access.ItemCallbackClient.registerClient(ItemCallbackClient.java:1990)
at com.thomsonreuters.ema.access.OmmBaseImpl.registerClient(OmmBaseImpl.java:385)
at com.thomsonreuters.ema.access.OmmNiProviderImpl.registerClient(OmmNiProviderImpl.java:280)
at com.thomsonreuters.ema.access.OmmNiProviderImpl.registerClient(OmmNiProviderImpl.java:263)

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Best Answer

  • wasin.w
    wasin.w admin
    Answer ✓

    Hi @david.gardiner

    I can replicate the same issue with EMA Java 1.1.1's NIProvider example 350 application. If the application does failover to the second ADH, the application encounters the same exception when the API sends Dictionary Request message to the second ADH.

    You can submit this issue in GitHub issue page to the Development team directly.

    Please see my exception messages below:

    Jan 11, 2018 6:13:06 PM com.thomsonreuters.ema.access.ChannelCallbackClient reactorChannelEventCallback
    WARNING: loggerMsg
        ClientName: ChannelCallbackClient
        Severity: Warning
        Text:    Received ChannelDownReconnecting event on channel Channel_1
        RsslReactor Channel is null
        Error Id 0
        Internal sysError 0
        Error Location Reactor.processWorkerEvent
        Error text Error initializing channel: errorId=-1 text=Connection refused: no further information
    loggerMsgEnd


    Jan 11, 2018 6:13:07 PM com.thomsonreuters.ema.access.ChannelCallbackClient reactorChannelEventCallback
    INFO: loggerMsg
        ClientName: ChannelCallbackClient
        Severity: Info
        Text:    Received ChannelUp event on channel Channel_3
        Instance Name Provider_1_1
        Component Version adh3.2.0.L1.linux.tis.rrg 64-bit
    loggerMsgEnd


    Exception in thread "main" java.lang.NullPointerException
        at com.thomsonreuters.ema.access.NiProviderDictionaryItem.rsslSubmit(DictionaryCallbackClient.java:1920)
        at com.thomsonreuters.ema.access.NiProviderDictionaryItem.open(DictionaryCallbackClient.java:1777)
        at com.thomsonreuters.ema.access.ItemCallbackClient.registerClient(ItemCallbackClient.java:1990)
        at com.thomsonreuters.ema.access.OmmBaseImpl.registerClient(OmmBaseImpl.java:380)
        at com.thomsonreuters.ema.access.OmmNiProviderImpl.registerClient(OmmNiProviderImpl.java:280)
        at com.thomsonreuters.ema.access.OmmNiProviderImpl.registerClient(OmmNiProviderImpl.java:263)
        at com.thomsonreuters.ema.examples.training.niprovider.series300.example350__Dictionary__Streaming.NiProvider.main(NiProvider.java:135)

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