MartijnVisser opened a new pull request, #28270:
URL: https://github.com/apache/flink/pull/28270
## What is the purpose of the change
`StreamNetworkBenchmarkEnvironment` bound its test NettyServer to
`InetAddress.getLocalHost()`, whose reverse DNS is not guaranteed to match
`local127.keystore`'s SAN list (`localhost`, `127.0.0.1`, `::1`). On
GitHub-hosted Azure runners the reverse DNS returns an internal `cloudapp.net`
FQDN, the SSL handshake in `NettyClient` fails with `No subject alternative DNS
name matching <fqdn> found`, and the SSL benchmarks hang until the runner times
out. This is the root cause of FLINK-39787.
## Brief change log
- Initialise `StreamNetworkBenchmarkEnvironment.LOCAL_ADDRESS` with
`InetAddress.getLoopbackAddress()`; drop the now-unnecessary static initialiser
block.
## Verifying this change
This change is exercised by the SSL / OpenSSL variants of
`StreamNetworkThroughputBenchmark` in the external
[flink-benchmarks](https://github.com/apache/flink-benchmarks) project.
End-to-end verified on flink-benchmarks CI with the equivalent loopback bind
applied at the `/etc/hosts` level: the SSL benchmark suite completes in normal
time on Azure-hosted GitHub runners, versus the prior 6-hour timeout.
## Does this pull request potentially affect one of the following parts:
- Dependencies (does it add or upgrade a dependency): no
- The public API, i.e., is any changed class annotated with
`@Public(Evolving)`: no
- The serializers: no
- The runtime per-record code paths (performance sensitive): no
- Anything that affects deployment or recovery: JobManager (and its
components), Checkpointing, Kubernetes/Yarn, ZooKeeper: no
- The S3 file system connector: no
## Documentation
- Does this pull request introduce a new feature? no
- If yes, how is the feature documented? not applicable
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