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From Shawn Heisey <>
Subject Re: Initializing core takes very long at times
Date Wed, 05 Aug 2015 15:42:32 GMT
On 8/5/2015 7:56 AM, Robert Kr├╝ger wrote:
> OK, now that I had a reproducible setup I could debug where it hangs:
> public SystemInfoHandler(CoreContainer cc) {
>     super();
> = cc;
>     init();
>   }
>   private void init() {
>     try {
>       InetAddress addr = InetAddress.getLocalHost();
>       hostname = addr.getCanonicalHostName();
> ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ this is where it hangs
>     } catch (UnknownHostException e) {
>       //default to null
>     }
>   }
> so it depends on my current network setup even for the embedded case. any
> idea how I can stop solr from making that call? InetAddress.getLocalHost()
> in this case returns some local vpn address and thus the reverse lookup
> times out after 30 seconds. This actually happens twice, once when
> initializing the container, again when initializing the core, so in my case
> a minute per restart and looking at the code, I don't see how I can work
> around this other than patching solr, which I am trying to avoid like hell.

Because almost all users are using Solr in a mode where it requires the
network, that code cannot be eliminated from Solr.

It is critical that your machine's local network is set up completely
right when you are running applications that are (normally)
network-aware.  Generally that means having relevant entries for all
interfaces in your hosts file and making sure that the DNS resolver code
included with the operating system is not buggy.

If you're dealing with a VPN or something else where the address is
acquired from elsewhere, then you need to make sure that the machine has
at least two DNS servers configured, that one of them is working, and
that the forward and reverse DNS on those servers are completely set up
for that interface's IP address.  Bugs in the DNS resolver code can
complicate this.


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