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From Robert Krüger (JIRA) <j...@apache.org>
Subject [jira] [Commented] (SOLR-7884) Omit reverse lookups in SystemInfoHandler
Date Mon, 17 Aug 2015 10:31:45 GMT

    [ https://issues.apache.org/jira/browse/SOLR-7884?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14699348#comment-14699348
] 

Robert Krüger commented on SOLR-7884:
-------------------------------------

Would, as an alternative solution something like a system property that disables the canonical
name retrieval, be OK?

> Omit reverse lookups in SystemInfoHandler
> -----------------------------------------
>
>                 Key: SOLR-7884
>                 URL: https://issues.apache.org/jira/browse/SOLR-7884
>             Project: Solr
>          Issue Type: Improvement
>    Affects Versions: 5.2.1
>            Reporter: Robert Krüger
>         Attachments: SOLR-7884.patch
>
>
> The method SystemInfoHandler.init contains this code:
> {code:java}
>   try {
>       InetAddress addr = InetAddress.getLocalHost();
>       hostname = addr.getCanonicalHostName();
>     } catch (UnknownHostException e) {
>       //default to null
>     }
>   }
> {code}
> The call to getCanonicalHostName triggers a DNS reverse lookup, that on Mac OSX times
out after 30 seconds if the current network setup has a problem with reverse lookup and then
returns the IP address as host name. In our product this leads to a hang of 2x30 seconds (one
for the SystemInfoHandler of the container and another one for that of the core) during startup
under these conditions. Unfortunately I have found no way to make this reproducible by simulating
it as it depends on local network config, os and whatever else.
> As Solr is shipped bundled with a desktop application, there is currently no workaround
because the user network configuration is beyond our reach.
> The suggested fix for this is to replace the call to getCanonicalHostName by one to getHostName(),
which is done for exactly this purpose (obtaining a host string for logging) in the popular
Logback framework (see http://logback.qos.ch/xref/ch/qos/logback/core/util/ContextUtil.html,
how they do it).
> Otherwise Solr has been working perfectly in this setup (bundled with a desktop app)
for a long time and it would be great to remove that last obstacle to make it a nicer citizen
bundlingwise.



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