Michael Viamari created KAFKA-9694:
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Summary: Reduce String Operations during WindowStore Operations
Key: KAFKA-9694
URL: https://issues.apache.org/jira/browse/KAFKA-9694
Project: Kafka
Issue Type: Improvement
Components: streams
Affects Versions: 2.4.0
Reporter: Michael Viamari
During most (all?) window store operations, whenever a timestamp is required a
call to {{ApiUtils.validateMillisecondXXXX}} is used to validate the inputs.
This involves a call to {{ApiUtils.prepareMillisCheckFailMsgPrefix}}, which
builds part of a string that is used for any necessary error messages. The
string is constructed whether or not it is used, which incurs overhead
penalties for the WindowStore operation. This has a nominally minimal impact,
but can add up in scenarios that involve a lot of WindowStore operations, where
performance is at a premium.
To reduce this overhead, {{ApiUtils.prepareMillisCheckFailMsgPrefix}} could
return a {{Supplier<String>}} instead, so that the string operations only occur
when the string is needed.
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