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https://issues.apache.org/jira/browse/FLINK-10988?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Till Rohrmann updated FLINK-10988:
----------------------------------
    Component/s:     (was: Runtime / Coordination)
                 Runtime / Operators

> Improve debugging / visibility of job state
> -------------------------------------------
>
>                 Key: FLINK-10988
>                 URL: https://issues.apache.org/jira/browse/FLINK-10988
>             Project: Flink
>          Issue Type: Improvement
>          Components: Runtime / Operators
>            Reporter: Scott Sue
>            Priority: Major
>
> When a Flink Job is running and encounters an unexpected exception, either 
> through processing an expected message, or a message that may be well formed, 
> but the state of the job renders a exception.  It can be difficult to 
> diagnose the cause of the issue.  For example I would get a NPE in one of the 
> Operators:
> 2018-11-13 10:10:26,332 INFO 
> org.apache.flink.runtime.executiongraph.ExecutionGraph - 
> Co-Process-Broadcast-Keyed -> Map -> Map -> Sin
> k: Unnamed (1/1) (9a8f3b970570742b7b174a01a9bb1405) switched from RUNNING to 
> FAILED.
> java.lang.NullPointerException
>  at 
> com.celertech.analytics.flink.topology.marketimpact.PriceUtils.findPriceForEntryType(PriceUtils.java:28)
>  at 
> com.celertech.analytics.flink.topology.marketimpact.PriceUtils.getPriceForMarketDataEntryType(PriceUtils.java:18)
>  at 
> com.celertech.analytics.flink.function.midrate.MidRateBroadcaster.processBroadcastElement(MidRateBroadcaster.java:77)
>  at 
> com.celertech.analytics.flink.function.midrate.MidRateTagKeyedBroadcastProcessFunction.processBroadcastElement(MidRateTagKeyedBroa
> dcastProcessFunction.java:36)
>  at 
> com.celertech.analytics.flink.function.midrate.MidRateTagKeyedBroadcastProcessFunction.processBroadcastElement(MidRateTagKeyedBroa
> dcastProcessFunction.java:12)
>  at 
> org.apache.flink.streaming.api.operators.co.CoBroadcastWithKeyedOperator.processElement2(CoBroadcastWithKeyedOperator.java:121)
>  
> An improvement to this would be to allow the printing of the incoming message 
> so the developer can diagnose if that message was correct.  Printing of the 
> state of the job would be nice as well just in case the state of the job was 
> incorrect leading to the exception
>  



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