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https://issues.apache.org/jira/browse/HTTPASYNC-31?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13539413#comment-13539413
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Sebastiano Vigna commented on HTTPASYNC-31:
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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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