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https://issues.apache.org/jira/browse/FLINK-9435?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16549712#comment-16549712
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ASF GitHub Bot commented on FLINK-9435:
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Github user asfgit closed the pull request at:
https://github.com/apache/flink/pull/6115
> Remove per-key selection Tuple instantiation via reflection in
> ComparableKeySelector and ArrayKeySelector
> ---------------------------------------------------------------------------------------------------------
>
> 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, 1.3.2, 1.3.3, 1.4.0, 1.5.0, 1.4.1, 1.4.2,
> 1.6.0
> Reporter: Nico Kruber
> Assignee: Nico Kruber
> Priority: Major
> Labels: pull-request-available
>
> Inside {{KeySelectorUtil}}, 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.
> Similarly, {{ArrayKeySelector}} instantiates new {{Tuple}} instances via
> reflection which can be changed the same way.
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