[JDK-8257080] Java does not try all DNS results when opening a socket

[Benjamin Marwell]

Sounds good to me, but – to be honest – a simpler solution would be enough
for now, at least for me. I actually need something which works on Java 8.

I also want to share an excerpt from an RFC:


RFC 1123

2.3  Applications on Multihomed hosts
… Application protocol implementations **SHOULD** be prepared
to try multiple addresses from the list until success is obtained.  …

SRC: https://tools.ietf.org/html/rfc1123

Java sadly does not implement this.

Am Mi., 16. Dez. 2020 um 20:33 Uhr schrieb Bernd Eckenfels <
ecki at zusammenkunft.net>:

> Hello,
>
> A „happy eyeballs“ implementation, not only for Multiple IPv4 addresses
> but also for IPV6/IPv4 Mixed would be a good thing, however since this
>
> a) adds additional connection Timeouts or decreases connection deadlines
> b) potentially is stateful
>
> I think it’s not a good idea to enable it for all connections. A new
> method to specify a policy (and allow a new default policy) would probably
> be better.
>
> I don’t think doing that in the resolving alone would work, since there is
> also a question of parallelity and a endpoint specific state.
>
> Gruss
> Bernd
> --
> http://bernd.eckenfels.net
> ------------------------------
> *Von:* net-dev <net-dev-retn at openjdk.java.net> im Auftrag von Aleks
> Efimov <aleksej.efimov at oracle.com>
> *Gesendet:* Wednesday, December 16, 2020 5:53:02 PM
> *An:* Benjamin Marwell <bmarwell at apache.org>
> *Cc:* Alan Bateman <Alan.Bateman at oracle.com>; OpenJDK Network Dev list <
> net-dev at openjdk.java.net>
> *Betreff:* Re: [JDK-8257080] Java does not try all DNS results when
> opening a socket
>
> Hi Benjamin,
>
> As Alan stated I'm working on adding an SPI [1] which will provide a
> possibility to alter how host names and IP addresses are resolved by JDK
> platform.
> I believe it would be possible to use this mechanism for addressing
> issue described in JDK-8257080.
>
> Best Regards,
> Aleksei
>
> [1] WIP jdk-sandbox branch:
> https://github.com/openjdk/jdk-sandbox/tree/JDK-8244202-nspi-stream-branch
>
>
> On 16/12/2020 15:42, Alan Bateman wrote:
> > On 16/12/2020 15:21, Benjamin Marwell wrote:
> >> https://bugs.java.com/bugdatabase/view_bug.do?bug_id=8192780
> >>
> >> Granted, it is an SPI. But it seemed to have been used.
> >>
> >
> > Aleksej Efimov is working on an InetAddress SPI, I'm sure there will
> > be a draft JEP at some point. It has the potential to complement the
> > exploration that we discussing here.
> >
> > -Alan
>
>
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