Robert Krüger created SOLR-7884:
-----------------------------------
Summary: 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
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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