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ci: Design and implement a comprehensive performance regression presubmit/continuous job - #4104
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This PR introduces a framework for performance regression testing in the Java Spanner client library using JMH (Java Microbenchmark Harness), as outlined in our internal design document for performance regression detection.
Key Changes:
google.spanner.v1.Spanner/StreamingReadgoogle.spanner.v1.Spanner/ExecuteStreamingSqlPurpose:
The main objective is to establish an automated system to detect performance regressions within the client library code before they impact users. This setup helps ensure that changes and new features do not negatively affect the library's latency and throughput.
Internal Reference: b/414281827