[jira] [Created] (KAFKA-9694) Reduce String Operations during WindowStore Operations

["Michael Viamari (Jira)" <ji...@apache.org>]

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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