Hi Jeyhun,
I'd like to understand better the premise of RichFunctions and why
|init(Some params)|,|close() |are said to be needed.
To me at least it feels strange that something is called a function yet
doesn't follow the functional interface definition of having just one
abstract method. I suppose init and close could be made default methods
with empty bodies once Java 7 support is dropped to mitigate that
concern. Still, I feel some resistance to consider something that
requires initialisation and closing (which implies holding state) as
being a function. Sounds more like the Processor/Transformer kind of
thing semantically, rather than a function.
The KIP says there are multiple use-cases for this but doesn't enumerate
any - I think some examples would be useful, otherwise that section
sounds a little bit vague.
IMHO, it's the access to the RecordContext is where the added value lies
but maybe I'm just lacking in imagination, so I'm asking all this to
better understand the rationale for init() and close().
Thanks,
Michał
On 20/05/17 17:05, Jeyhun Karimov wrote:
Dear community,
As we discussed in KIP-149 [DISCUSS] thread [1], I would like to initiate
KIP for rich functions (interfaces) [2].
I would like to get your comments.
[1]
http://search-hadoop.com/m/Kafka/uyzND1PMjdk2CslH12?subj=Re+DISCUSS+KIP+149+Enabling+key+access+in+ValueTransformer+ValueMapper+and+ValueJoiner
[2]
https://cwiki.apache.org/confluence/display/KAFKA/KIP-159%3A+Introducing+Rich+functions+to+Streams
Cheers,
Jeyhun
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