netty: Increase HPACK encoder bucket count to 128 - #13077
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| Http2FrameReader frameReader = new DefaultHttp2FrameReader(headersDecoder); | ||
| Http2HeadersEncoder encoder = new DefaultHttp2HeadersEncoder( | ||
| sensitivityDetector(neverIndexedMetadataKeys), false, 16, Integer.MAX_VALUE); | ||
| sensitivityDetector(neverIndexedMetadataKeys), false, 128, Integer.MAX_VALUE); |
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Can we add a TODO to upstream changes to Netty before we can migrate to the Http2FrameCodecBuilder API that does not allow injecting a custom Http2HeadersEncoder subclass?
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Co-Authored-By: Codex <noreply@openai.com>
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Increase the HPACK encoder bucket count from 16 to 128 for both clients and servers. Netty 4.1.138/4.2.18 limits encoder tables to
bucket count × 64when processing a peer's table-size setting, so this allows up to 8 KiB within the peer's advertised limit. Advertised table sizes and the Netty dependency version are unchanged.Separate JMH benchmark and results: at the same 4 KiB capacity, 128 buckets reduced synthetic mixed-header processing time by 24–28%, with unchanged per-request allocation and encoded size. Encoder construction allocated an additional 896 bytes with compressed references.
Related to #12973. Discovered by @ejona86.