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  • By Dan Tehranian
    Discovering Issues with HTTP/2 via Chaos Testing http2-p99-3

    TL;DR

    While HTTP/2 provides for a number of improvements over HTTP/1.x, via Chaos Testing we discovered that there are situations where HTTP/2 will perform worse than HTTP/1.

    When there is packet loss on the network, congestion controls at the TCP layer will throttle the HTTP/2 streams that are multiplexed within fewer TCP connections. Additionally, because of TCP retry logic, packet loss affecting a single TCP connection will simultaneously impact several HTTP/2 streams while retries occur. In other words, head-of-line blocking has effectively moved from layer 7 of the network stack down to layer 4.

    Background & the Service Mesh Space

    Service meshes are an increasingly common networking model for cloud native architectures. By putting the logic needed for fast and reliable interservice communications into a sidecar process, developers on independent teams, working in the technology stack of their choice, can get a ...

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