racorn opened a new issue #8056:
URL: https://github.com/apache/pulsar/issues/8056
I tried to set up proxy SNI routing with HAProxy - in a reverse proxy
configuration, using the features added for PIP-60. The Pulsar cluster behind
HAProxy had hostnames that were only resolvable locally in the datacenter where
the HAProxy and Pulsar brokers were deployed.
The client failed with an `UnknownHostExeception `that could be traced to
the following lines in the `ConnectionPool `class:
```
String hostname = unresolvedAddress.getHostString();
int port = unresolvedAddress.getPort();
try {
// For non-sni-proxy: Resolve DNS --> Attempt to connect to all
IP addresses until once succeeds
CompletableFuture<List<InetAddress>> resolvedAddress =
isSniProxy()
?
CompletableFuture.completedFuture(Lists.newArrayList(InetAddress.getByName(hostname)))
: resolveName(hostname);
return resolvedAddress
.thenCompose(inetAddresses ->
connectToResolvedAddresses(inetAddresses.iterator(), port));
```
As the resolved hostname is only used as the value of the SNI header field,
and not for the TCP-connection (the client connects to the host given in
ProxyUrl), **I wonder if it should be required that the 'internal hosts' must
be resolvable to the client**? (Also the `InetAddress.getByName` invocation
seems to involve blocking IO).
#### System configuration
**Pulsar version**: 2.6.1
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