k8s: Update fabric8 to 6.13.1, switch to Vert.x http client. #17913
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fabric8 6.x uses the OkHttp client by default, which itself uses an unbounded-size cached pool, with 60s timeout, for making requests. In production with large task counts, this leads to lots of thread churn. The Vert.x client is the default in fabric8 7.x, and is better behaved. By default it uses a worker pool of 20 threads (see javadoc for VertxOptions). This patch uses fabric8 6.13.1 rather than some later version, because higher versions are not compatible with Jackson 2.12.
clintropolis
approved these changes
Apr 15, 2025
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fabric8 6.x uses the OkHttp client by default, which itself uses an unbounded-size cached pool, with 60s timeout, for making requests. In production with large task counts, this leads to lots of thread churn.
The Vert.x client is the default in fabric8 7.x, and is better behaved. By default it uses a worker pool of 20 threads (see javadoc for VertxOptions).
This patch uses fabric8 6.13.1 rather than some later version, because higher versions are not compatible with Jackson 2.12.
Btw: I initially tried using the Jetty http client, since fabric8 does support that now. However, I ran into linking problems because fabric8 is written against Jetty 12 and we use Jetty 9. Some classes it needed were missing. So I ended up going with Vert.x instead. The implementation in fabric8 is probably better tested, anyway, since Vert.x is the default now in fabric8 7.x.