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https://issues.apache.org/jira/browse/FLINK-9435?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16489222#comment-16489222
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Timo Walther commented on FLINK-9435:
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I think an even more performant way would be a set of Java MethodHandles.
> Remove per-key selection Tuple instantiation via reflection in
> KeySelectorUtil#ComparableKeySelector
> ----------------------------------------------------------------------------------------------------
>
> Key: FLINK-9435
> URL: https://issues.apache.org/jira/browse/FLINK-9435
> Project: Flink
> Issue Type: Improvement
> Components: Streaming
> Affects Versions: 1.3.0, 1.3.1, 1.4.0, 1.3.2, 1.3.3, 1.5.0, 1.4.1, 1.4.2,
> 1.6.0
> Reporter: Nico Kruber
> Assignee: Nico Kruber
> Priority: Major
>
> Every {{ComparableKeySelector#getKey()}} call currently creates a new tuple
> from {{Tuple.getTupleClass(keyLength).newInstance();}} which seems expensive.
> Instead, we could get a template tuple and use {{Tuple#copy()}} which copies
> the right sub-class in a more optimal way.
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