Socket::gethostbyname does reverse DNS lookup for IP address and is slow if no
DNS reverse lookup reply is received
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Key: JRUBY-3812
URL: http://jira.codehaus.org/browse/JRUBY-3812
Project: JRuby
Issue Type: Bug
Components: Core Classes/Modules
Affects Versions: JRuby 1.3.1
Reporter: Raimonds Simanovskis
Socket::gethostbyname(host_name) finds IP address of host_name and then does
reverse DNS lookup for IP address (was traced down using tcpdump on Mac OS X).
If DNS server is not returning reverse DNS name for IP adress, then this method
on Mac OS X took about 20 seconds.
Discussed with headius on IRC and here are potential reasons:
headius:http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=6413593
headius: it seems that it's not our call to getByName, but a subsequent call to
getCanonicalHostName that does it
On MRI it is not doing reverse DNS lookup and always is very fast.
Socket::gethostbyname(Socket::gethostname) call is used in DataObjects drivers
and as a result on some machines loading DataObjects JDBC driver could take
very long time.
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