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Posted to dev@hc.apache.org by "Sebastiano Vigna (JIRA)" <ji...@apache.org> on 2012/12/25 17:58:13 UTC
[jira] [Commented] (HTTPASYNC-31) There should be a simple way to
inject a DNS resolution strategy
[ https://issues.apache.org/jira/browse/HTTPASYNC-31?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13539413#comment-13539413 ]
Sebastiano Vigna commented on HTTPASYNC-31:
-------------------------------------------
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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