[streaming] mappers(reducers) read database again to get the changed config

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[streaming] mappers(reducers) read database again to get the changed config

Sendoh
Hi Flink users,

We have an usecase that streaming Flink jobs reading small configuration(no more than 100 rows/10 columns) to transform data source according to the config. When there is change, database should be read again and the config object is changed.

Did someone has similar usage or have an in idea what would be the best practice?
(Unrelated to Flink part: use Notify/Listen rather than to read DB every X minute)

So we either 1.let workers(mappers/reducers) keep connection and read DB again when there is change, or 2.let master read DB and transfer this small data to workers(mappers/reducers). But how would the later look like? would it be to put the data in ExecutionConfig and let worker read ExecutionConfig repeatedly? Would there be a critical factor that determine which one is better than the other?

Best,

Sendoh
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