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https://issues.apache.org/jira/browse/BEAM-11005?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17549027#comment-17549027
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Danny McCormick commented on BEAM-11005:
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This issue has been migrated to https://github.com/apache/beam/issues/20637
> Can't use side inputs with Combine.PerKeyWithHotKeyFanout
> ---------------------------------------------------------
>
> Key: BEAM-11005
> URL: https://issues.apache.org/jira/browse/BEAM-11005
> Project: Beam
> Issue Type: Bug
> Components: sdk-java-core
> Reporter: Mia Gil Epner
> Priority: P3
> Labels: Clarified, starter
>
> 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]):
>
> {code:java}
> public PerKeyWithHotKeyFanout<K, InputT, OutputT> withHotKeyFanout(
> SerializableFunction<? super K, Integer> hotKeyFanout) {
> return new PerKeyWithHotKeyFanout<>(fn, fnDisplayData, hotKeyFanout);
> }
> {code}
> We would like to be able to use side inputs and hot key fanout.
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