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stephen.coleman avatar image
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Why is the EMA logging Unknown msgClass errors?

We've written a service running in AWS using Java EMA 3.4.0.1 and connecting to EDP. It's receiving MMT_MARKET_PRICE and MMT_MARKET_BY_ORDER messages for 2,600 ASX RICs.

Occasionally our service is failing randomly with an OutOfMemoryError: GC overhead limit exceeded. It can run for days without issues and then fails. We're monitoring memory use can can't see any issues prior to failure.

About 5 minutes prior to failure we see this error in the log from EMA

loggerMsg\n ClientName: ChannelCallbackClient\n Severity: Warning\n Text: Received ChannelDownReconnecting event on channel Channel_3\n\tRsslReactor @44d8d44\n\tRsslChannel @25739122\n\tError Id 0\n\tInternal sysError 0\n\tError Location null\n\tError text CompressorException: invalid code lengths set\nloggerMsgEnd\n\n

Then when the channel reconnects we see these errors coming from EMA prior to the channel going down again.

Unknown msgClass: 0

Unknown msgClass: 19

Unknown msgClass: 14

Unknown msgClass: 25

Unknown msgClass: 13

Unknown msgClass: 29

Unknown msgClass: 17

Unknown msgClass: 26

Unknown msgClass: 30

Unknown msgClass: 27

This can happen several times then the POD CPU goes to 100% and eventually fails with a memory exception.

Subsequent to the first ChannelDownReconnecting event above we see an these errors with the channel going down then reconnects again.

loggerMsg\n ClientName: ChannelCallbackClient\n Severity: Warning\n Text: Received ChannelDownReconnecting event on channel Channel_3\n\tRsslReactor @44d8d44\n\tRsslChannel @12980f25\n\tError Id -1\n\tInternal sysError 0\n\tError Location Reactor.performChannelRead\n\tError text \nloggerMsgEnd\n\n

I haven't been able to replicate this issue locally in Dev so it's difficult to determine if the EMA errors are the cause of our service failure or a symptom of some other issue.

What does 'CompressorException: invalid code lengths set' mean?

And why are these 'Unknown msgClass' messages raised?

Thanks

elektronrefinitiv-realtimeelektron-sdkrrtema-apirdp-apielektron-message-apierror
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wasin.w avatar image wasin.w

Hello @stephen.coleman

Thank you for your participation in the forum. Is the reply below satisfactory in resolving your query?


If so please can you click the 'Accept' text next to the appropriate reply. This will guide all community members who have a similar question.

Thanks,


AHS

1 Answer

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umer.nalla avatar image
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Hi @stephen.coleman

Unknown msgClass usually indicates the Message Type (Refresh, Update, Status etc) is not defined for this event/message - indicating a corrupt/invalid payload content.

The only place I can see the '"invalid code lengths set" message is in the zlib library source code.

Given that you are losing your connection to ERT (EDP) - you should raise a ticket with the ERT in Cloud team to investigate these connectivity losses. Make sure you choose Elektron Real Time in Cloud as the Product (and not an API - otherwise it will go to the wrong team).

You could also raise a ticket with Developer Support to investigate if data is getting corrupted at the API level perhaps after a connection loss/recovery scenario?


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stephen.coleman avatar image stephen.coleman

Thanks Umer, I'll raise this with the ERT in Cloud team and see how I go.

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