Re: 回复： RFR (XS) 8237806: Convert TIMEOUT of sun.net.dns.ResolverConfigurationImpl into property

[Alan Bateman]

On 24/01/2020 09:53, Denghui Dong wrote:
>
> yes, you are right.
In that case, 
src/share/classes/sun/net/spi/nameservice/dns/DNSNameService.java is 
probably the code that should be reading the property and then creating 
the ResolverConfiguration with this timeout. Reading the property there 
will help you get the property name consistent with the existing 
sun.net.spi.nameservice.* properties.

As I think you know, the sun.net.spi.nameservice provider mechanism was 
replaced in JDK 9 with a simpler "hosts file" mechanism that is useful 
for testing environments. It's not a complete replacement to the 
problematic mechanism that was in JDK 8 and older. Separately, there is 
work in the sandbox, aefimov-dns-client-branch, with prototype of a new 
implementation that can work as an alternative to the platform's 
resolver. The motivation is Project Loom where we don't have virtual 
threads blocked in libnsl/equivalent. There are several issues to 
consider so still TBD if this will be proposed in a JEP.

As regards going forward on your change then I think you will have to 
engage with the jdk8u-dev mailing list on what processes to follow. 
Depending on the where this goes then it might be that the main line (as 
in jdk/jdk) should have a timeout parameter on the open/other method, or 
maybe it will be superseded by working in the aefimov-dns-client-branch.

-Alan.