zheguang opened a new pull request, #21706: URL: https://github.com/apache/kafka/pull/21706
This patch implements two optimizations, and their JMH benchmarks. 1. Skipping Previously the raw value extraction in headers-aware deserializers undergoes deserialization and/or copying of headers, while only skipping is required. This happens for both empty and nonempty headers. 2. Empty headers copying Empty headers have constant metadata footprint: the headers size is varint-encoded 1 byte of 0, and headers themselves consume no bytes. Based on this invariant, the ByteBuffer-based extraction can be replaced with a direct `System.arraycopy`, which is a Java native method optimized for specific platforms. **Benchmark:** This patch also includes JMH benchmarks to test the speedup. On my local machine, Optimization 1 speedup is 2-6x speedup. Optimization 2 is 1.35x. Below is the throughput comparison of a recorded JMH run: ``` Benchmark Mode Cnt Score Error Units RawBytesExtraction.testRawAggregationWithHeaders thrpt 15 1481.854 ± 31.448 ops/s RawBytesExtraction.testRawAggregationWithHeadersOpt thrpt 15 11797.165 ± 103.432 ops/s RawBytesExtraction.testRawAggregationWithoutHeaders thrpt 15 8359.080 ± 47.918 ops/s RawBytesExtraction.testRawAggregationWithoutHeadersOpt thrpt 15 15298.827 ± 452.741 ops/s RawBytesExtraction.testRawValueWithoutHeaders thrpt 15 11329.997 ± 260.399 ops/s RawBytesExtraction.testRawValueWithoutHeadersOpt thrpt 15 15372.816 ± 184.651 ops/s ``` **Test:** - Existing unit test covering nonempty headers - Added test case for empty headers -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. To unsubscribe, e-mail: [email protected] For queries about this service, please contact Infrastructure at: [email protected]
