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https://issues.apache.org/jira/browse/FLINK-8560?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16371136#comment-16371136
]
ASF GitHub Bot commented on FLINK-8560:
---------------------------------------
Github user pnowojski commented on a diff in the pull request:
https://github.com/apache/flink/pull/5481#discussion_r169573342
--- Diff:
flink-streaming-java/src/main/java/org/apache/flink/streaming/api/datastream/DataStream.java
---
@@ -654,6 +648,63 @@ public ExecutionConfig getExecutionConfig() {
return transform("Process", outputType, operator);
}
+ /**
+ * Applies the given {@link KeyedProcessFunction} on the input stream,
thereby creating a transformed output stream.
+ *
+ * <p>The function will be called for every element in the input
streams and can produce zero
+ * or more output elements.
+ *
+ * @param keyedProcessFunction The {@link ProcessFunction} that is
called for each element in the stream.
+ *
+ * @param <K> The type of key in {@code KeyedProcessFunction}.
+ *
+ * @param <R> The type of elements emitted by the {@code
KeyedProcessFunction}.
+ *
+ * @return The transformed {@link DataStream}.
+ */
+ @PublicEvolving
+ public <K, R> SingleOutputStreamOperator<R>
process(KeyedProcessFunction<K, T, R> keyedProcessFunction) {
--- End diff --
Does it make sense to add `process` with a `KeyedProcessFunction` on non
keyed `DataStream`?
> add KeyedProcessFunction to expose the key in onTimer() and other methods
> -------------------------------------------------------------------------
>
> Key: FLINK-8560
> URL: https://issues.apache.org/jira/browse/FLINK-8560
> Project: Flink
> Issue Type: Improvement
> Components: DataStream API
> Affects Versions: 1.4.0
> Reporter: Jürgen Thomann
> Assignee: Bowen Li
> Priority: Major
> Fix For: 1.5.0
>
>
> Currently it is required to store the key of a keyBy() in the processElement
> method to have access to it in the OnTimerContext.
> This is not so good as you have to check in the processElement method for
> every element if the key is already stored and set it if it's not already set.
> A possible solution would adding OnTimerContext#getCurrentKey() or a similar
> method. Maybe having it in the open() method could maybe work as well.
> http://apache-flink-user-mailing-list-archive.2336050.n4.nabble.com/Getting-Key-from-keyBy-in-ProcessFunction-tt18126.html
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