apache/beam

Can't use side inputs with Combine.PerKeyWithHotKeyFanout

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#20.637 geöffnet am 4. Juni 2022

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Beschreibung

PerKeyWithHotKeyFanout doesn't allow a user to specify a side input and access it in the CombineFn. When the function withHotKeyFanout is called, any sideinputs stored in the Combine.PerKey are dropped. (https://github.com/apache/beam/blob/master/sdks/java/core/src/main/java/org/apache/beam/sdk/transforms/Combine.java#L1571): 


    public PerKeyWithHotKeyFanout<K, InputT, OutputT> withHotKeyFanout(
        SerializableFunction<?
super K, Integer> hotKeyFanout) {
      return new PerKeyWithHotKeyFanout<>(fn, fnDisplayData, hotKeyFanout);

   }

We would like to be able to use side inputs and hot key fanout.

Imported from Jira BEAM-11005. Original Jira may contain additional context. Reported by: miagilepner.

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