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From "Sebastiano Vigna (JIRA)" <j...@apache.org>
Subject [jira] [Issue Comment Deleted] (HTTPASYNC-31) There should be a simple way to inject a DNS resolution strategy
Date Sat, 05 Jan 2013 19:44:12 GMT

     [ https://issues.apache.org/jira/browse/HTTPASYNC-31?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Sebastiano Vigna updated HTTPASYNC-31:
--------------------------------------

    Comment: was deleted

(was: I'll add another argument in favour of DNS-resolution injection: we are experimenting
a different DNS resolution behaviour depending on the platform. On Mac OS X, INetAddress.getByName()
issues only a DNS lookup. But on Linux, we *always* get a reverse lookup, too. Moreover, the
reverse lookup is not performed on the servers configured with sun.net.spi.nameservice.nameservers,
but rather on those in resolv.conf. It's quite a mess to follow and track with tcpdump.

org.xbill.DNS.Address.getByName() does not have this problem and behaves as expected on all
platforms.
)
    
> There should be a simple way to inject a DNS resolution strategy
> ----------------------------------------------------------------
>
>                 Key: HTTPASYNC-31
>                 URL: https://issues.apache.org/jira/browse/HTTPASYNC-31
>             Project: HttpComponents HttpAsyncClient
>          Issue Type: Improvement
>    Affects Versions: 4.0-beta3
>            Reporter: Sebastiano Vigna
>
> With DefaultHttpClient it is not difficult to use a custom DNS resolution strategy (e.g.,
DNSJava) by using a
> specialized DefaultConnectionOperator. Doing the same with the asynchronous client presently
is very difficult as it requires to create an entirely new connection manager (and the standard
implementation uses many package-accessible implementations, so this requires modifying the
actual HttpAsyncClient distribution). For a client able to open simultaneously thousands of
connections careful DNS management is essential.
> Of course it is in principle possible to use a local installation of BIND etc., but it
would be nice to be able to do configurable DNS caching in pure Java.

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