JRuby and open-uri File handle issue

Ruby JRuby
1

As stated in another thread we have been seeing the number of open file
handles increase through out the day until Tomcat is restarted.

We are using Rails 2.3.5 with Tomcat 5 OpenJDK 1.6.0-b09 and Jruby 1.4
on RHEL 5.4.

I have finally tracked down the culprit. Using open-uri like so:

open(“http://www.google.com”) {|f|
f.each_line {|line| p line}
}

Causes following to be added to the tomcat lsof entries:

java 20153 tomcat 95r FIFO 0,6 12572360
pipe
java 20153 tomcat 99w FIFO 0,6 12572360
pipe
java 20153 tomcat 100r 0000 0,11 0 12572361
eventpoll

These are not released until Tomcat is restarted. Note that there are
always two “pipes” and 1 eventpoll entry added each time the open
function is executed.

Any ideas on this one? Is this a known issue?

2

NOTE: its not specific to the open-uri wrapper. The problem is down in
the net/http class somewhere.

I can duplicate with the following as well:

Net::HTTP.get_print URI.parse(‘Example Domain’)

3

I have setup a test outside of rails an Tomcat:

require ‘open-uri’

x = open(“http://www.lecza.com”)
puts x.read
x.close
x = nil
puts STDIN.read

When I run the code above with Ruby those handles are not stuck (while
on the read)

When I run it with Jruby I see the handles stuck until I terminate the
script.

I tried Jruby 1.4.0 and 1.5.0 RC2 and both have the same issue.

4

FYI - I opened a bug: http://jira.codehaus.org/browse/JRUBY-4767