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From Robert Krüger (JIRA) <>
Subject [jira] [Created] (SOLR-7884) Omit reverse lookups in SystemInfoHandler
Date Thu, 06 Aug 2015 17:33:07 GMT
Robert Krüger created SOLR-7884:

             Summary: Omit reverse lookups in SystemInfoHandler
                 Key: SOLR-7884
             Project: Solr
          Issue Type: Improvement
    Affects Versions: 5.2.1
            Reporter: Robert Krüger

The method SystemInfoHandler.init contains this code:

  try {
      InetAddress addr = InetAddress.getLocalHost();
      hostname = addr.getCanonicalHostName();
    } catch (UnknownHostException e) {
      //default to null

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,
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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