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From Fabian Hueske <fhue...@gmail.com>
Subject Re: Tracking deserialization errors
Date Mon, 16 Apr 2018 11:42:15 GMT
Thanks for starting the discussion Elias.

I see two ways to address this issue.

1) Add an interface that a deserialization schema can implement to register
metrics. Each source would need to check for the interface and call it to
setup metrics.
2) Check for null returns in the source functions and increment a
respective counter.

In both cases, we need to touch the source connectors.

I see that passing information such as topic name, partition, and offset
are important debugging information. However, I don't think that metrics
would be good to capture them.
In that case, log files might be a better approach.

I'm not sure to what extend the source functions (Kafka, Kinesis) support
such error tracking.
Adding Gordon to the thread who knows the internals of the connectors.

Best, Fabian

2018-04-08 17:53 GMT+02:00 Alexander Smirnov <alexander.smirnoff@gmail.com>:

> I have the same question. In case of kafka source, it would be good to
> know topic name and offset of the corrupted message for further
> investigation.
> Looks like the only option is to write messages into a log file
> On Fri, Apr 6, 2018 at 9:12 PM Elias Levy <fearsome.lucidity@gmail.com>
> wrote:
>> I was wondering how are folks tracking deserialization errors.  The AbstractDeserializationSchema
>> interface provides no mechanism for the deserializer to instantiate a
>> metric counter, and "deserialize" must return a null instead of raising an
>> exception in case of error if you want your job to continue functioning
>> during a deserialization error.  But that means such errors are invisible.
>> Thoughts?

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