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
Best Answer
-
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?
0
Answers
-
Thanks Umer, I'll raise this with the ERT in Cloud team and see how I go.
0
Categories
- All Categories
- 6 AHS
- 36 Alpha
- 166 App Studio
- 6 Block Chain
- 4 Bot Platform
- 18 Connected Risk APIs
- 47 Data Fusion
- 33 Data Model Discovery
- 682 Datastream
- 1.4K DSS
- 613 Eikon COM
- 5.2K Eikon Data APIs
- 10 Electronic Trading
- Generic FIX
- 7 Local Bank Node API
- 3 Trading API
- 2.9K Elektron
- 1.4K EMA
- 248 ETA
- 552 WebSocket API
- 37 FX Venues
- 14 FX Market Data
- 1 FX Post Trade
- 1 FX Trading - Matching
- 12 FX Trading – RFQ Maker
- 5 Intelligent Tagging
- 2 Legal One
- 23 Messenger Bot
- 3 Messenger Side by Side
- 9 ONESOURCE
- 7 Indirect Tax
- 60 Open Calais
- 275 Open PermID
- 44 Entity Search
- 2 Org ID
- 1 PAM
- PAM - Logging
- 6 Product Insight
- Project Tracking
- ProView
- ProView Internal
- 22 RDMS
- 1.8K Refinitiv Data Platform
- 622 Refinitiv Data Platform Libraries
- 4 LSEG Due Diligence
- LSEG Due Diligence Portal API
- 4 Refinitiv Due Dilligence Centre
- Rose's Space
- 1.2K Screening
- 18 Qual-ID API
- 13 Screening Deployed
- 23 Screening Online
- 12 World-Check Customer Risk Screener
- 1K World-Check One
- 46 World-Check One Zero Footprint
- 45 Side by Side Integration API
- 2 Test Space
- 3 Thomson One Smart
- 10 TR Knowledge Graph
- 151 Transactions
- 143 REDI API
- 1.8K TREP APIs
- 4 CAT
- 26 DACS Station
- 121 Open DACS
- 1.1K RFA
- 104 UPA
- 191 TREP Infrastructure
- 228 TRKD
- 915 TRTH
- 5 Velocity Analytics
- 9 Wealth Management Web Services
- 84 Workspace SDK
- 11 Element Framework
- 5 Grid
- 18 World-Check Data File
- 1 Yield Book Analytics
- 46 中文论坛